Updated on 2024/02/15

写真a

 
ARIKAWA Taro
 
Organization
Faculty of Science and Engineering Professor
Other responsible organization
Civil, Human and Environmental Science and Engineering Course of Graduate School of Science and Engineering, Master's Program
Civil, Human and Environmental Science and Engineering Course of Graduate School of Science and Engineering, Doctoral Program
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • 博士(工学) ( 東京大学 )

  • 修士(工学) ( 東京大学 )

Education

  • 2000.3
     

    The University of Tokyo   Graduate School, Division of Engineering   doctor course   completed

  • 1997.3
     

    The University of Tokyo   Graduate School, Division of Engineering   master course   completed

  • 1995.3
     

    The University of Tokyo   Faculty of Engineering   graduated

  • 1991.3
     

    大阪教育大学教育学部附属平野高等学校   graduated

Research History

  • 2021.4 - Now

    Kagawa University   Visiting Professor

  • 2015.4 - Now

    中央大学 理工学部 教授

  • 2018.3 - 2019.4

    Kagawa University   Visiting Professor

  • 2017.4 - 2018.3

    Japan Agency for Marine-Earth Science and Technology

  • 2015.4 - 2018.3

    国立研究開発法人 港湾空港技術研究所 客員研究官

  • 2014.4 - 2015.3

    港湾空港技術研究所 海洋情報・津波研究領域 上席研究官

  • 2013.10 - 2015.3

    長岡技術科学大学 客員准教授

  • 2011.4 - 2014.3

    港湾空港技術研究所 海洋研究領域 上席研究官

  • 2009.10 - 2011.3

    横浜国立大学 客員准教授

  • 2002.10 - 2011.3

    港湾空港技術研究所 海洋・水工部 主任研究官

  • 2003.10 - 2008.3

    横浜国立大学 非常勤講師

  • 2001.4 - 2002.9

    (独立行政法人)港湾空港技術研究所 (組織名改変)   Researcher

  • 2001.10 - 2002.3

    横浜国立大学 非常勤講師

  • 2000.4 - 2001.3

    運輸省港湾技術研究所 入省

  • 2000.4 - 2001.3

    運輸省 港湾技術研究所 入省

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Professional Memberships

  • 土木学会

  • Japan Society of Civil Engineering

  • 日本地盤工学会

  • 日本建築学会

Research Interests

  • Coast

  • Wave

  • Numerical Simulation

  • Digital Imaging

  • 海岸

  • 数値計算

  • 画像処理

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Hydroengineering

Papers

  • Sensitivity analysis of the physics options in the Weather Research and Forecasting model for typhoon forecasting in Japan and its impacts on storm surge simulations

    Tomoki Shirai, Yota Enomoto, Masashi Watanabe, Taro Arikawa

    COASTAL ENGINEERING JOURNAL   64 ( 4 )   506 - 532   2022.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    Weather Research and Forecasting (WRF) model is useful for forecasting typhoons as an external force of storm surge forecasts. This study examines the variation in typhoon forecasts caused by different choices of arbitrary physics options in WRF and their influence on storm surge forecasts. Eight frequently used combinations of cloud microphysics and planetary boundary layers were extracted via a review of previous studies. Subsequently, sensitivity analyses of these physics options were performed, targeting nine typhoons that landed in Japan during 2015-2019. Additionally, we conducted case studies of storm surge ensemble forecasts in Tokyo Bay and Osaka Bay using WRF-simulated typhoons generated in the sensitivity analysis. As a result, the ensemble mean of the forecasts was comparable to the storm surge reanalysis simulation results obtained using an empirical typhoon model wherein the best track data is integrated to reproduce atmospheric fields. This may be attributed to the fact that the typhoon parameters (intensity, size, approaching angle, and velocity) obtained from the best track at landfall were generally within the range of the parameters that were simulated using WRF.

    DOI: 10.1080/21664250.2022.2124040

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  • Preliminary Observations and Impact in Japan of the Tsunami Caused by the Tonga Volcanic Eruption on January 15, 2022

    Fumihiko Imamura, Anawat Suppasri, Taro Arikawa, Shunichi Koshimura, Kenji Satake, Yuichiro Tanioka

    Pure and Applied Geophysics   179 ( 5 )   1549 - 1560   2022.5

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    The tsunami caused by the Tonga submarine volcanic eruption that occurred at 13:15 Japan Time (JST) on January 15, 2022, exposed a blind spot in Japan’s tsunami monitoring and warning system, which was established in 1952 for local tsunamis and expanded to distant tsunamis after the 1960 Chile tsunami. This paper summarizes how the warning system responded to the unprecedented tsunami, the actual evacuation process, and the damage it caused in Japan. Initially, the tsunami from the volcanic eruption was expected to arrive at approximately midnight with amplitudes of less than 20 cm. However, a series of short waves arrived at approximately 21:00, a few hours earlier than expected. The early arrival of these sea waves coincided with a rapid increase in atmospheric pressure; then, the short-period component was predominant, and the wave height was amplified while forming wave groups. After a 1.2 m tsunami was observed in Amami City in southern Japan at 23:55 JST, the Japan Meteorological Agency issued a tsunami warning/advisory. The tsunami continued, and all advisories were cleared at 14:00 JST on January 16. Information about this tsunami and the response to it are summarized here, including the characteristics and issues of the actual tsunami evacuation situation in each region. There were no casualties, but the issues that emerged included difficulty evacuating on a winter night and traffic congestion due to evacuation by car and under the conditions of the COVID-19 pandemic. In the coastal area, damage to fishing boats and aquaculture facilities was reported due to the flow of the tsunami. In addition, damage to aquaculture facilities, including those producing oysters, scallops, seaweed and other marine products, decreased the supply of marine products, and the economic impact is likely to increase in the future.

    DOI: 10.1007/s00024-022-03058-0

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  • Variation analysis of multiple tsunami inundation models

    Yoshinori Shigihara, Kentaro Imai, Hiroyuki Iwase, Koji Kawasaki, Makoto Nemoto, Toshitaka Baba, Naotaka Yamamoto Chikasada, Yu Chida, Taro Arikawa

    Coastal Engineering Journal   64 ( 2 )   1 - 28   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa {UK} Limited  

    Researchers have developed tsunami inundation models based on nonlinear shallow water equations to estimate tsunami propagation and inundation. However, their empirical results are not in perfect agreement with those of other research institutes, even though the same governing equations are used. Therefore, we quantitatively evaluated the variability of tsunami simulations in this study. Several research institutes have conducted tsunami simulations under the same input conditions using tsunami inundation models adopted for tsunami hazard assessment, resulting in a certain degree of variability among them. By examining the spatial and temporal differences in various physical quantities, we identified the characteristic topography where the variability between tsunami simulations increases. A novel method for calculating statistics from the area integrals of physical quantities was proposed to demonstrate the variability in the overall simulation results. In addition, the effects of different setting parameters and computational environments on the simulation results of a single model were evaluated. The findings of this study are expected to not only serve as a basis to verify the reliability of source codes employed by users of the tsunami inundation model, but also contribute useful technical information to advance probabilistic tsunami hazard assessment in the future.

    DOI: 10.1080/21664250.2021.1991730

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  • Validation of tsunami numerical simulation models for an idealized coastal industrial site

    Masashi Watanabe, Taro Arikawa, Naoto Kihara, Chiaki Tsurudome, Koichi Hosaka, Tatsuto Kimura, Takayuki Hashimoto, Fumitaka Ishihara, Takemi Shikata, Daniel Shigueo Morikawa, Taiga Makino, Mitsuteru Asai, Yu Chida, Yoichi Ohnishi, Simone Marras, Abhishek Mukherjee, Juan Carlos Cajas, Guillaume Houzeaux, B D Paolo, Javier L. Lara, Gabriel Barajas, Íñigo J. Losada, Masanobu Hasebe, Yoshinori Shigihara, Tatsuya Asai, Tsuyoshi Ikeya, Shusaku Inoue, Hideo Matsutomi, Yoshiaki Nakano, Yasuo Okuda, Shunya Okuno, Takayuki Ooie, Gaku Shoji, Tomokazu Tateno

    Coastal Engineering Journal   64 ( 2 )   1 - 42   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa {UK} Limited  

    Numerous tsunami numerical models have been proposed, but their prediction accuracies have not been directly compared. For quantifying the modeling uncertainties, the authors statistically analyzed the prediction results submitted by participants in the tsunami blind contest held at the 17th World Conference on Earthquake Engineering. The reproducibility of offshore water level generated due to the tsunami with soliton fission significantly decreased when the nonlinear shallow water equation models (NSWE) was used compared to three-dimensional (3D) models. The inundation depth was reproduced well in 3D models. However, the reproducibility of wave forces acting on the structure and velocities over land was lower in 3D models than that in NSWE models. For cases where the impulsive tsunami wave pressure generated could not be calculated based on the hydrostatic assumption, the prediction accuracy of the NSWE models was higher than that of the 3D models. The prediction accuracies of both models were not improved at small grid-cell sizes. The NSWE model cannot simulate the short-wave component and vertical pressure distribution. Therefore, further developments in 3D models and smoothed particle hydrodynamics methods (SPH) are needed. The presented results contribute to the future development of tsunami numerical simulation tools.

    DOI: 10.1080/21664250.2022.2072611

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  • A STUDY ON TSUNAMI PROPAGATION BY THE 2022 HUNGA TONGA-HUNGA HA’API ERUPTION

    Tatsuhiko TOKUTA, Taro ARIKAWA, Tomohiro TAKAGAWA, Yu CHIDA, Anawat SUPPASRI, Naotaka CHIKASADA, Nobuhito MORI, Fumihiko IMAMURA

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   78 ( 2 )   I_145 - I_150   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/kaigan.78.2_i_145

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  • IMPACTS OF WRF CONFIGURATION IN TYPHOON FORECASTS AS AN EXTERNAL FORCE OF STORM SURGE SIMULATIONS

    SHIRAI Tomoki, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   78 ( 2 )   I_199 - I_204   2022

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    To improve the accuracy of storm surge forecasting, it is desirable to improve the typhoon forecasting accuracy. The typhoon forecasting model WRF has a high degree of freedom in setting its calculation conditions. In this study, we conducted sensitivity analyses of the WRF’s calculation domain settings, initial and boundary conditions, and physics options, which have a large impact on typhoon forecasting due to the differences in their settings among model users. Here we show that (1) horizontal resolution has a greater impact on typhoon forecasting than location of calculation domain, (2) the choice of analysis data used for initial conditions of WRF has a greater impact on typhoon forecasting than lateral boundary conditions, and (3) the relationship between forecast start time and variability of storm surge forecasting due to differences in the setting of physics options of WRF. These results are useful for evaluating the uncertainty in typhoon and storm surge forecasts caused by differences in the WRF’s calculation conditions. In the future, introducing more sophisticated data assimilation (e.g., 4DVAR, EnKF) in typhoon forecasting seems necessary to improve the typhoon and storm surge forecasting accuracy.

    DOI: 10.2208/kaigan.78.2_i_199

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  • FUNDAMENTAL STUDY ON UNCERTAINTY OF DEBRIS DRIFT BEHAVIOR DURING TSUNAMI AND ITS APPLICATION TO NUMERICAL SIMULATION

    SHIRAI Tomoki, MORITA Riko, ENOMOTO Yota, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   78 ( 2 )   I_421 - I_426   2022

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    The behavior of drifting debris at the time of a tsunami is subject to large uncertainties, and therefore it is common to use a random-motion model in numerical simulations for probabilistic evaluation. However, currently we do not have enough knowledge on the degree of variation in drifting behavior due to differences in the shape and specific weight of drifting objects, and thus we need to improve the evaluation of the variation in numerical simulations. Here we demonstrate that the effects of changing the shape and specific weight of drifting debris on drifting behavior by conducting hydraulic experiments. Based on the experiments, the variation coefficient that should be given to the drifting behavior in the random-motion model was estimated as a constant multiple of the previous value. As a result, we found that a 10 times of the previous variation coefficient can best qualitatively reproduce the uncertainty in the drifting behavior. In the future, considering a variation coefficient that takes the draft into account to improve the accuracy of drift simulations just before drifting ashore.

    DOI: 10.2208/kaigan.78.2_i_421

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  • Consideration of submarine landslide induced by 2018 Sulawesi earthquake and tsunami within Palu Bay

    Kaori Nagai, Abdul Muhari, Kwanchai Pakoksung, Masashi Watanabe, Anawat Suppasri, Taro Arikawa, Fumihiko Imamura

    Coastal Engineering Journal   63 ( 4 )   1 - 21   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa {UK} Limited  

    On September 28 2018, an Mw 7.5 strike-slip earthquake occurred to the north of Palu Bay on the Sulawesi Island, Indonesia. This triggered a destructive tsunami within the bay, which reached Palu city. Simulation have been conducted to investigate the landslide source. However, the tsunami should be investigated considering a physical model in the area where detailed bathymetric survey had not been conducted. In this study, we investigated the impact of coastal landslides on the southern part of the bay using a two-layer model. Owing to the increasing collapse volume, the southern west coastal landslide could approximately explain the observations in Palu city. However, the calculated mass volume of the source largely overestimated the bathymetric survey data. Hence, we considered the possibility of submarine landslide in the southern part of the bay and the simulation results could approximately explain the maximum tsunami heights in the southern part of the bay. These results suggest that more detailed multibeam data will be required to investigate the possible submarine landslide in the southern area which could induce a destructive tsunami reaching Palu city within a few minutes after the collapse.

    DOI: 10.1080/21664250.2021.1933749

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  • A physical model of tsunami inundation and wave pressures for an idealized coastal industrial site

    Naoto Kihara, Taro Arikawa, Tatsuya Asai, Masanobu Hasebe, Tsuyoshi Ikeya, Shunsaku Inoue, Hideki Kaida, Hideo Matsutomi, Yoshiaki Nakano, Yasuo Okuda, Shunya Okuno, Takayuki Ooie, Yoshinori Shigihara, Gaku Shoji, Tomokazu Tateno, Chiaki Tsurudome, Masashi Watanabe

    Coastal Engineering   169   103970 - 103970   2021.10

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.coastaleng.2021.103970

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  • DEVELOPMENT OF A PROBABILISTIC TSUNAMI HAZARD ASSESSMENT METHOD (CORAL METHOD) AND ITS APPLICATION TO TSUNAMI INUNDATION ASSESSMENT

    福谷陽, 北野利一, 安田誠宏, 有川太郎, 山中亮一

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • NUMERICAL MODELING OF TSUNAMI ATTENUATION EFFECT WITH MANGROVE

    TADOKORO Ayaka, PRASETYO Adi, MURATA Shin, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_913 - I_918   2021

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    Coastal vegetation, such as coastal forests and mangroves, has been focused on its mitigation effects as green infrastructure. However, the current numerical calculation speeds do not allow for detailed modeling of vegetation with complex root structures. In this study, we aimed to establish a low-cost calculation method for mangroves by using the porosity. The validity of the method was verified by comparing with physical experiments, and the disaster mitigation effect of a raised road was examined using the cross-sectional shape of the local site. The numerical results are consistent with the experimental results, although they are slightly underestimated.

    DOI: 10.2208/kaigan.77.2_i_913

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  • MACHANISM OF LOCAL SCOUR PREVENTION AROUND MONOPILE OFFSHORE WIND TURBINE

    CHEN Syaoyue, 榎本容太, 渡部真史, 浜地克也, 石垣匠, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • MACHANISM OF LOCAL SCOUR PREVENTION AROUND MONOPILE OFFSHORE WIND TURBINE

    CHEN Syaoyue, ENOMOTO Yota, WATANABE Masashi, HAMACHI Katsuya, ISHIGAKI Takumi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_559 - I_564   2021

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    For the scour protection against local scouring phenomena in the foundation of monopile offshore wind farms, there are still many quantitative studies on the necessary scour protection area. In addition, it is necessary to consider the scale effect in hydraulic model experiments dealing with geomaterials. In this study, we conducted experiments at two different scales, 1/65 and 1/130, compared to the previous large-scale experiment at 1/13 scale. From the experiments, the appropriate similarity law for the geomaterials including the scour protection works was confirmed, and the effectiveness of the scour protection works was discussed. The scour depths of each experiment were compared based on the similarity of the sedimentation rates, and the results showed that the experiments were reproducible. It was also found that a scour protection radius of about 1.5 times the diameter of the monopile was sufficient to counter the effects of the flow alone.

    DOI: 10.2208/kaigan.77.2_i_559

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  • EXAMINATION OF DAMAGE MITIGATION EFFECT USING MOVABLE BREAKWATERS BY TYPHOONS

    原田弥子, 渡部真史, 松本幸久, 森下和帆, 大西将之, 木原一禎, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • EXAMINATION OF EVACUATION PLAN FOR LANDSLIDE TSUNAMI AND SUBDUCTION ZONE EARTHQUAKE TSUNAMI

    HUANG Pan, 永井香織, 村田慎, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • A DEVELPOMENT OF AN AUTOMATICALLY DETERMINING METHOD FOR CALCULATION CONDITION OF WRF USING MACHINE LEARNING FOR THE PURPOSE OF IMPROVEMENT OF REALTIME STORM SURGE PREDICTION ACCURACY

    白井知輝, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • EFFECT OF DIFFERENT VULNERABILITY OF PROTECTION FACILITIES ON TSUNAMI INUNDATION PROBABILITY

    有川太郎, 宮内俊晴, 北野利一, 福谷陽, 渡部真史

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • A Study on Tsunami Arrival Time Prediction by Machine Learning

    郡司滉大, 宮内俊晴, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • STUDY ON PRESSURE REDUCTION EFFECT BY UPLIFT FORCES AND APERTURE RATIO ON HORIZONTAL PLATFORM BASED ON GAS-LIQUID PHASE FLOW MODEL

    岡本大史, 大久保寛, 笠原宏紹, 中村直志, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • STUDY ON UNCERTAINTY OF TSUNAMI DEBRIS MOTION BY INITIAL ARRANGMENT UNCERTAINTY IN DRIFT MOTION

    盛田理子, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • NUMERICAL MODELING OF TSUNAMI ATTENUATION EFFECT WITH MANGROVE

    田所彩花, PRASETYO Adi, 村田慎, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • MOTION OF FLOATING CAISSON USING 3D NUMERICAL WAVE TANK

    高木淳史, 渡部真史, 有川太郎

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • A STUDY ON VESSEL DRIFTING SIMULATION ACCURACY USING VARIOUS METEOROLOGICAL MODELS

    徳永正吾, 有川太郎, 黒澤一真, 平石晃士, 渡部真史

    土木学会論文集 B2(海岸工学)(Web)   77 ( 2 )   2021

  • 崖上に分布する津波石を活用した琉球列島に襲来した古津波の実態解明

    渡部真史, 有川太郎

    深田研究助成研究報告   2020   2021

  • Three-dimensional Modeling for Deformation and Movement of Siltfence in Water: Coupled Simulation of Water Flow and Siltfence

    Yamada Susumu, Machida Masahiko, Tanaka Minori, Seki Katsumi, Arikawa Taro

    Transactions of the Japan Society for Industrial and Applied Mathematics   31 ( 1 )   20 - 43   2021

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    Language:Japanese   Publisher:The Japan Society for Industrial and Applied Mathematics  

    Abstract. Siltfence is a curtain-like structure to prevent the spread of suspended pollutants generated by constructions in rivers or coasts, and its shape deforms horizontally and vertically. In this paper, we propose a modeling method to simulate the siltfence deformed in the two directions by coupling with water flow dynamics. We preform numerical simulations on a siltfence installed in flume using the proposed method, and we confirm its validity by comparing between the simulation and flume experiment.

    DOI: 10.11540/jsiamt.31.1_20

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  • EFFECT OF DIFFERENT VULNERABILITY OF PROTECTION FACILITIES ON TSUNAMI INUNDATION PROBABILITY

    ARIKAWA Taro, MIYAUCHI Toshiharu, KITANO Toshikazu, FUKUTANI Yo, WATANABE Masashi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_223 - I_228   2021

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    Numerous combinations of disaster reduction facilities should be taken into consideration to evaluate the damages of inundation due to probabilistic tsunami hazard. In this study, we implemented it and investigated how the tsunami inundation probability changes by using the levee fragility model. coRaL method was used to obtain the inundation depth exceedance probability and applied to two different terrains. The results showed that the probability was between the case of overtopping and collapse and the case of overtopping but no breach, which was found to be reasonable, and they support the effectiveness of levee fragility model.

    DOI: 10.2208/kaigan.77.2_i_223

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  • A DEVELPOMENT OF AN AUTOMATICALLY DETERMINING METHOD FOR CALCULATION CONDITION OF WRF USING MACHINE LEARNING FOR THE PURPOSE OF IMPROVEMENT OF REALTIME STORM SURGE PREDICTION ACCURACY

    SHIRAI Tomoki, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_139 - I_144   2021

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    In order to improve the accuracy of storm surge prediction in real time, it is necessary to improve the accuracy of typhoon prediction. For this purpose, it is important to properly set the calculation conditions of meteorological models, which have often been determined empirically. In this study, we developed a system using machine learning to automatically suggest combinations of physics options of the WRF to achieve the highest prediction accuracy for newly generated typhoons. As a result, we confirmed the improvement of typhoon forecasting accuracy by using this method, which selects physics options of WRF based on typhoon characteristics such as the position of typhoon occurrence, the maximum diameter of the wind field and so on. In addition, by using the typhoon prediction results as the external force for storm surge estimation, the prediction accuracy of maximum storm surge was improved on average in many locations, and in some locations the accuracy was significantly improved, indicating the effectiveness of our method, although further verification is required.

    DOI: 10.2208/kaigan.77.2_i_139

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  • 3次元数値波動水槽を用いた捨石消波工の消波効果について

    後藤 崇寛, 渡部 真史, 有川 太郎

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. Series B2, Coastal engineering / 土木学会海岸工学委員会 編   77 ( 2 )   3p   2021

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    Language:Japanese   Publisher:土木学会  

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  • 水-土構造の連成数値解析を用いた津波発生時の浸透流による防波堤構造への影響評価

    観音寺 里佳, 妙中 真治, 森安 俊介, 出路 丈時, 出渡部 真史, 有川 太郎

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. Series B2, Coastal engineering / 土木学会海岸工学委員会 編   77 ( 2 )   3p   2021

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  • STUDY ON UNCERTAINTY OF TSUNAMI DEBRIS MOTION BY INITIAL ARRANGMENT UNCERTAINTY IN DRIFT MOTION

    MORITA Riko, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_313 - I_318   2021

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    When a tsunami strikes, not only structures but also many people are swept away, leading to an increase in the number of missing and dead people. It is important to predict the behavior of drifted debris and the extent of drift after a tsunami in order to protect facilities and save lives. However, the drift behavior is highly variable. In this study, the effect of the initial position on the drifting behavior was experimentally investigated. The results showed that the degree of variability increases with the drifting distance, and the relation between the distance and the variability perpendicular to the drifting direction in this experiment was presented. In the numerical calculation, it was confirmed that the drift direction was in good agreement with the average of the experimental values, although there was some variability.

    DOI: 10.2208/kaigan.77.2_i_313

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  • EXAMINATION OF DAMAGE MITIGATION EFFECT USING MOVABLE BREAKWATERS BY TYPHOONS

    HARADA Yako, WATANABE Masashi, MATSUMOTO Yukihisa, MORISHITA Kazuho, ONISHI Masayuki, KIHARA Kazuyoshi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_823 - I_828   2021

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    In this study, the effectiveness of the movable breakwaters for reducing the water level and preventing storm surge was investigated at Tokyo Bay under the worst-case scenario based on an empirical typhoon model. As a result, the water level reduction effect of the movable breakwaters at the harbor was 11.2-42.2 % for each installation and 27.4-45.7 % for multiple installations in the typhoon path where the maximum stormsurge was observed. In addition, it was found that the multiple installation of the system was effective for reducing the water level in the river, while the installation of the system only at the mouth of the river was sufficient to prevent stormsurge. In addition, a comparison the method of raising the levee, conventional strengthen-ing, and the movable breakwaters on the inundation control effect showed that the movable breakwaters was more effective than the method of raising the levee uniformly by 3.0 m in the case that install multiple breakwaters in the harbor and in the river.

    DOI: 10.2208/kaigan.77.2_i_823

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  • A STUDY ON VESSEL DRIFTING SIMULATION ACCURACY USING VARIOUS METEOROLOGICAL MODELS

    TOKUNAGA Shogo, ARIKAWA Taro, KUROSAWA Kazuma, HIRAISHI Koushi, WATANABE Masashi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_1015 - I_1020   2021

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    In this study, a method for predicting the drift of vessels during typhoons is developed, and the accuracy of predicting the drift of vessels is investigated by calculating the drift using various weather prediction models. The prediction method is based on the domain meteorological model WRF, the Japan Meteorological Agency's GSM (Japan region), and the forecast data of MSM. The results of the prediction calculations showed that, on average, the error of the predicted drifting position from the measured value was about 1 to 4 km, but in the case of a vessel at anchor, the prediction accuracy of the drifting wake and the drifting point was higher in the case with a higher prediction accuracy of the wind field. However, in order to improve the accuracy of predicting the anchorage of a vessel during a typhoon, it is necessary to take into account various uncertainty factors, such as the anchor chain, waves, and the use of the main engine, in order to improve the calculation accuracy, such as the conditions for the start of drifting.

    DOI: 10.2208/kaigan.77.2_i_1015

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  • DEVELOPMENT OF A PROBABILISTIC TSUNAMI HAZARD ASSESSMENT METHOD (CORAL METHOD) AND ITS APPLICATION TO TSUNAMI INUNDATION ASSESSMENT

    FUKUTANI Yo, KITANO Toshikazu, YASUDA Tomohiro, ARIKAWA Taro, YAMANAKA Ryoichi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_175 - I_180   2021

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    We propose the coRaL method (a method of incorporating Random phase model into Logic tree approach), which is a probabilistic tsunami hazard assessment method with a high objectivity by reforming the evaluation method of earthquake asperity model and the concept of aleatory uncertainty among the probabilistic methods using logic tree approach conventionally used in Japan. The proposed method is applied to the cities located along the Pacific coast where the tsunami risk due to the Nankai Trough megathrust earthquake is assumed. We show that the proposed method can evaluate the tsunami inundation depth distribution for each return period (e.g., 150 years, 500 years, 1000 years, 2500 years), and for each percentile considering the uncertainty of tsunami hazard assessment even for the same return period.

    DOI: 10.2208/kaigan.77.2_i_175

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  • EXAMINATION OF EVACUATION PLAN FOR LANDSLIDE TSUNAMI AND SUBDUCTION ZONE EARTHQUAKE TSUNAMI

    HUANG Pan, NAGAI Kaori, MURATA Shin, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_241 - I_246   2021

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    Since the event of the 2018 Palu tsunami in Indonesia, the countermeasures for reducing tsunami damage have been considered in Palu city where the destructive landslide tsunami event occurred. The tsunami induced by landslide in the Palu bay could reach the coastline of Palu city within a few minutes. On the other hand, there is a possibility that the tsunami induced a subduction-zone earthquake along the Makassar strait could cause the larger inundation area than that of landslide tsunami, although the tsunami could reach the coastline 20 minutes or more after the earthquake.

     In this study, we investigated an effective countermeasure for complex disaster of landslide tsunami occurring in the Palu Bay and anticipated maximum tsunami induced by a subduction-zone earthquake along the Makassar strait in Palu city based on reconstruction plan in the Sulawesi island. We selected the evacuation facilities based on tsunami hazard map of Palu city and assumed the elevated road along the coastline of Palu city to investigate the effect of tsunami damage reduction. As results of evacuation simulation, the elevated road and appropriate selection of evacuation facilities could reduce the mortality rate of the landslide tsunami. Moreover, the importance of establishment of evacuation facilities which could resist against the tsunami induced by the subduction-zone earthquake was implied by the presented examination.

    DOI: 10.2208/kaigan.77.2_i_241

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  • FUTURE CHALLENGES TO ADDRESS CLIMATE CHANGE IN JAPANESE COASTAL AREAS

    KUWAE Tomohiro, MITO Yugo, ARIKAWA Taro, ISHIKAWA Yoichi, KIDOKORO Hideaki, SHIBUTANI Yoko, SHIMURA Tomoya, SEINO Satoquo, HASUMI Kanako, MOGI Hirotada, YAMAKITA Takehisa, LEE Hansoo, KIM Sooyoul, KUBOTA Shinichi, KURAHARA Yoshinosuke, TSUJIO Daiki, NINOMIYA Junichi, BANNO Masayuki, FURUICHI Naoki, YASUDA Tomohiro, TAKEWAKA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 1 )   1 - 17   2021

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    Issues related to climate change in coastal areas have been addressed in a wide variety of academic fields and societies, including meteorology, marine physics, chemistry, biology, ecology, policy science, and economics. However, the efforts and initiatives of each relevant academic field or society are rarely shared because climate change science is so interdisciplinary. Furthermore, climate change issues in coastal areas can be studied from the perspective of current status, future prediction, impacts on natural phenomena and human activities, and mitigation and adaptation measures. However, there have been no studies examining researchers’ priorities in their respective academic fields, or issues for such studies in the future. In the present study, we conducted a survey concerning “Future Challenges to Address Climate Change in Japanese Coastal Areas” involving a variety of the member of academic societies interested in climate change. The results show that the top 10 keywords for future challenges to addressing climate change problems in coastal areas were “air and sea temperature”, “decline in biodiversity”, “sea level rise”, “extreme weather and climate”, “greenhouse gas”, “degradation of ecosystem services”, “typhoons and low pressure”, “decrease in fishery products”, “land loss and coastal erosion”, and “fishery management”. Clearly, the respondents placed a high priority on topics involving natural phenomena and human activities, but a low priority on climate-change countermeasures. This tendency was true both for individual keywords and for all the selected keywords together. The reasons for the keyword selection result are discussed, and the current status, future challenges and prospects in Japan are summarized for the top 10 keywords.

    DOI: 10.2208/kaigan.77.1_1

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    Other Link: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19K15106/

  • MOTION OF FLOATING CAISSON USING 3D NUMERICAL WAVE TANK

    TAKAGI Atsushi, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_775 - I_780   2021

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    The prediction and control of wave motions during the installation of a caisson can improve the efficiency of the work. In this study, the oscillation of a caisson is investigated using a solid-gas-liquid three-phase numerical wave tank, which can analyze the movement and deformation of structures and the contact between structures due to fluid motion, and the results of numerical calculations are compared with those of hydraulic model experiments. As a result, the maximum displacement and its tendency were in good agreement with the hydraulic experiment by changing the grid size. The collision between the caisson and the mound was also investigated by changing the water draft, and it was shown that the oscillation decreased with increasing the water draft. The trend is in good agreement with that of Horisawa et al.1), indicating the importance of coupled analysis between fluid and structural analysis.

    DOI: 10.2208/kaigan.77.2_i_775

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  • STUDY ON PRESSURE REDUCTION EFFECT BY UPLIFT FORCES AND APERTURE RATIO ON HORIZONTAL PLATFORM BASED ON GAS-LIQUID PHASE FLOW MODEL

    OKAMOTO Daishi, OKUBO Hiroshi, KASAHARA Hirotsugu, NAKAMURA Naoshi, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_727 - I_732   2021

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    In this study, the lift pressures acting on a horizontal slab due to traveling and overlapping waves were analyzed using a gas-liquid two-phase numerical wave models, and the pressure reduction effect by adding holes to the slab was investigated. As a result, it was confirmed from the numerical simulation that the pressure caused by the air compression was generated when waves did not reach to the horizontal plate. In addition, it was found that the pressure due to air compression was reduced to some extent by adding an aperture, and the reduction rate depended on the relative clearance and aperture ratio. For future studies, the response of the structure and the multi-directional irregular waves should be investigated to improve the versatility of the practical design.

    DOI: 10.2208/kaigan.77.2_i_727

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  • A Study on Tsunami Arrival Time Prediction by Machine Learning

    GUNJI Kota, MIYAUCHI Toshiharu, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   77 ( 2 )   I_307 - I_312   2021

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    In this study, as an initial step for instantaneous tsunami arrival time prediction after an earthquake, we used images of the initial water level obtained from numerical tsunami simulations for the Nankai Trough to predict the tsunami arrival time using machine learning. The arrival times were pre-processed and colored every 3 minutes and every 2 minutes for training. The accuracy of the tsunami arrival time prediction was improved by increasing the number of training data, and the error of the tsunami arrival time was within 3 minutes in some places. In addition, we compared the prediction accuracy of A town and B city in Mie prefecture to confirm the difference. Although the inundation area is overestimated and the arrival time is currently overestimated or underestimated, the arrival time of the tsunami is generally predicted well by machine learning based on the initial water level information.

    DOI: 10.2208/kaigan.77.2_i_307

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  • Volcanic eruption-induced tsunami at anak krakatau volcano, Sunda Strait, Indonesia

    Kaori Nagai, Taro Arikawa, Kwanchai Pakoksung, Fumihiko Imamura, Masashi Watanabe, Pan Huang

    Proceedings of the Coastal Engineering Conference   36 ( 2020 )   2020.12

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  • 令和元年台風19号及び台風21号による広域災害に関する総合研究

    二瓶, 泰雄, 仲江川, 敏之, 中北, 英一, 竹見, 哲也, 山田, 朋人, 三隅, 良平, 飯塚, 聡, 鈴木, 真一, 柳瀬, 亘, 立川, 康人, 田中, 茂信, 佐山, 敬洋, 田中, 智大, 朝位, 孝二, 清水, 義彦, 前野, 詩朗, 田中, 仁, 吉谷, 純一, 田中, 規夫, 泉, 典洋, 矢野, 真一郎, 森脇, 亮, 赤松, 良久, 内田, 龍彦, 重枝, 未玲, 岩崎, 理樹, 小山, 毅, 長谷川, 兼一, 西嶋, 一欽, 藤本, 郷史, 毛利, 栄征, 前田, 健一, 岡村, 未対, ト部, 厚志, 森口, 周二, 蝦名, 裕一, 松四, 雄騎, 王, 功輝, 竹林, 洋史, 鈴木, 素之, 田島, 芳満, 佐々木, 淳, 信岡, 尚道, 森, 信人, 有川, 太郎, 鈴木, 崇之, 下園, 武範, 松井, 正宏, 小林, 文明, 畑山, 満則, 牛山, 素行, 佐藤, 健, 梶谷, 義雄

    自然災害科学総合シンポジウム講演論文集   57   9 - 22   2020.9

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    令和元年台風19号では, 東日本の非常に広い範囲で長時間の豪雨をもたらし, 大規模な洪水氾濫が発生すると共に, 台風による過去最多の士砂災害件数, 竜巻などの強風被害, 記録的な高潮・高波被害が発生し, 甚大な人的・物的被害が生じた。その約2週間後には, 日本南岸の低気圧と台風21号による大雨が発生し, 千菓県や福島県などにて洪水氾濫が発生した。本研究では, 科研費・特別研究促進費による突発災害調査研究により, 台風19号, 21号による広域災害について, 全国から多分野の研究者が集結した総合研究を実施した。本報はその成果の一部を取りまとめたものである。また, 今後に向けての提言も一覧できる形でまとめている。
    2020年9月1日(火), 於 : Zoomによるオンライン開催

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  • 階層型連成シミュレータを用いた釜石湾における防波堤の破堤と浸水範囲に関する検討

    有川 太郎

    津波工学研究報告 = Tsunami engineering = research report of tsunami engineering / 東北大学災害科学国際研究所(津波工学研究分野) 編   ( 37 )   83 - 94   2020.7

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    Language:Japanese   Publisher:東北大学災害科学国際研究所(津波工学研究分野)  

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  • Coastal impacts of super typhoon Hagibis on Greater Tokyo and Shizuoka areas, Japan

    Takenori Shimozono, Yoshimitsu Tajima, Kenzou Kumagai, Taro Arikawa, Yukinobu Oda, Yoshinori Shigihara, Nobuhito Mori, Takayuki Suzuki

    Coastal Engineering Journal   62 ( 2 )   129 - 145   2020.4

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    DOI: 10.1080/21664250.2020.1744212

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  • Post-event survey of locally concentrated disaster due to 2019 Typhoon Faxai along the western shore of Tokyo Bay, Japan Reviewed

    Takayuki Suzuki, Yoshimitsu Tajima, Masashi Watanabe, Naoki Tsuruta, Hiroshi Takagi, Tomoyuki Takabatake, Kojiro Suzuki, Takenori Shimozono, Yoshinori Shigihara, Tomoya Shibayama, Shingo Kawaguchi, Taro Arikawa

    Coastal Engineering Journal   62 ( 2 )   146 - 158   2020.4

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    Typhoon Faxai caused severe damages along the western shore of Tokyo Bay, Japan in September 2019. Retaining a relatively small radius of maximum wind, Faxai passed across the center of Tokyo Bay and caused intensive wind and waves. While the sea level anomaly recorded at several tide gauge stations along Tokyo Bay were at most 1 m, and no significant surge-induced inundation was found, locally concentrated damages and wave-induced hazards were observed around Yokohama, on the middle-western shore of Tokyo Bay. The observed inundation height around Yokohama was TP (Tokyo Peil) 4.2 m on average, and the highest runup, TP 10.8 m, was observed at a small hill directly behind the seawall in Fukuura, Yokohama. The estimated wave overtopping directions at each location varied from the northeast to southeast, and no clear correlation was found between the wave overtopping directions and the extent of observed coastal hazards. Based on these findings and investigations of recorded data such as wind and waves, it was deduced that locally concentrated damages and hazards around the middle western shore of Tokyo Bay may be explained by the unique features of a relatively compact Faxai and the topographical characteristics of Tokyo Bay.

    DOI: 10.1080/21664250.2020.1738620

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  • STUDY ON THE EFFECT OF PREVENTING THE SPREAD OF POLLUTANTS DUE TO DOUBLE INSTALLATION OF SILTFENCE

    TANAKA Minori, WATANABE Masashi, MACHIDA Masahiko, YAMADA Susumu, ENOMOTO Yota, GUNJI Kota, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_103 - I_108   2020

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    Previous studies have shown that siltfences reduce the effect of preventing the spread of pollutants when flow velocity was increased. However, under the present circumstances, it may be necessary to use siltfences even under the condition that flow velocity is high. On the other hand, there is also an example that installation of multiple siltfences can efficiently prevent pollutants. In this study, a hydraulic experiment was conducted for quantitative evaluation of the diffusion prevention effect of pollutants using silefences under high-speed flow.

     As a result, it was found that the pollutants were more trapped by the influence of the first siltfence and the reduction of the puffing amount of the second siltfence. The deformed shape of the second siltfence was reproduced by using the previously proposed estimation formula with appropriate experimental constants. This effect was confirmed in the experiment using plane wave tank.

    DOI: 10.2208/kaigan.76.2_i_103

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    Other Link: http://id.ndl.go.jp/bib/030805706

  • THE EXAMINATION OF COLLISION SPEED REDUCTION EFFECT OF TSUNAMI DEBRIS AT THE TIP OF RUNUP WAVE BY REFLECTED WAVE

    MURASE Fumiya, WATANABE Masashi, HIRAISHI Koushi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_685 - I_690   2020

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    We conducted a hydraulic experiment in case that tsunami debris set on the land model. The tsunami debris was drifted at the tip of a runup wave and collided with the reflection wall. Then, we examined the effect of reducing the collision speed due to the buffer effect which occurred at the tip of the runup wave that firstly collided with the reflection wall. We also conducted experiments under the several conditions to examine why the length of reflected waves become increase. We examined the effect of the water mass against the collision probability and the collision speed under the condition that the runup wave and the water mass reflected by the wall coexist. In addition, it became possible to evaluate the collision velocity from "the reduction rate of the drift speed due to the reflected water mass" and "the length of the reflected water". Furthermore, we succeeded to evaluate the collision velocity using the theoretical equation of reducing collision speed in the reflected wave, quantitatively.

    DOI: 10.2208/kaigan.76.2_i_685

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    Other Link: http://id.ndl.go.jp/bib/030806939

  • EFFECTS OF DENSITY OF INUNDATION WATER ON TSUNAMI RUN-UP

    MATSUTOMI Hideo, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_391 - I_396   2020

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    Aiming for the advancement of historical and prospective tsunami scale evaluations, and focusing on the tsunami run-up, series solutions to the tip position a(t), velocity U (=da/dt) and acceleration d2a/dt2 in the tip region of inundation flow with sediment over a uniformly sloping bottom under the condition that the friction factor K is not linked to the density ρ of inundation water and analytical solutions to a(t), U, d2a/dt2, the maximum run-up distance am and height Rm under the condition that K is linked to ρ are derived, and effects of ρ on them and run-up process are theoretically examined. It is indicated that (1) in the run-up analysis (including numerical simulation) of tsunami with sediment under the condition of a constant K, even if am and Rm can be predicted accurately, there is a possibility of evaluating the run-up duration time inaccurately and vice versa, and (2) linking K to ρ is necessary to solve this matter. An expression for the relationship between K and ρ is also presented. Moreover, it is verified that the derived series and analytical solutions are useful to discuss the effects of ρ on the run-up of tsunami with sediment through a comparison between the experimental and theoretical maximum run-up distances.

    DOI: 10.2208/kaigan.76.2_i_391

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    Other Link: http://id.ndl.go.jp/bib/030297342

  • EXPERIMENTAL STUDY ON THE INFLUENCE OF SUSPENDED SILT AND SAND ON TSUNAMI FORCE

    KISE Koshu, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_385 - I_390   2020

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    When tsunami contains sediments, its wave force become strong due to increase of its density. This has a great influence on building damages. The sediment diameter collected from the tsunami at the time of the 2011 Tohoku-oki earthquake remained in Kesennuma City, Miyagi Prefecture was 6.74 µm, which is classified as silt. Tsunami wave force which contains sand sediments or silt has not been investigated. In this study, we conducted laboratory experiments on tsunami containing sediment. We then showed the tendency by investigating wave force, coefficient of wave pressure, angle of water surface, and its density. As a result, when density of tsunami was increased, it is likely that tsunami wave force become high and angle of wave front become variable when tsunami collides with vertical wall. We also showed that it is likely that wave pressure of tsunami is relatively increased when tsunami contains sediments even if Froude number is same.

    DOI: 10.2208/kaigan.76.2_i_385

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    Other Link: http://id.ndl.go.jp/bib/030806317

  • 港湾外郭施設設計のための数値計算の精度とコスト—ACCURACY AND COSTS OF NUMERICAL SIMULATION FOR DESIGN OF MARITIME STRUCTURES

    長谷川 巌, 有川 太郎

    海洋開発シンポジウム講演集   45   6p   2020

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  • ACCURACY AND COSTS OF NUMERICAL SIMULATION FOR DESIGN OF MARITIME STRUCTURS

    HASEGAWA Iwao, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   76 ( 2 )   I_115 - I_120   2020

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    Numerical simulations are now being applied in place of the physical model experiments that have been used in the design of maritime structures. In this paper, the transition from model experiments to numerical simulations in the field of design of maritime structures is investigated. For wave deformations such as wave shoaling and wave breaking and reflected waves of long-period waves, it is now possible to shift from physical model experiments to numerical simulations. Numerical simulations can be performed on wave pressure, wave overtopping, and transmitted wave, but when applied to actual design, accuracy verification is required and calculation speed is desired to be improved. At present, it is difficult to apply numerical simulations for phenomena accompanying movement of objects such as caisson sliding and wave dissipating block movement to actual design.

    DOI: 10.2208/jscejoe.76.2_i_115

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  • CONSTRUCTION OF DECISION SUPPORT SYSTEM FOR TSUNAMI EVACUATION BASED ON TSUNAMI SCENARIO BANK

    SAKATA Yusuke, SUZUKI Wataru, ARIKAWA Taro, AOI Shin

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_1249 - I_1254   2020

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    As a countermeasure for reducing tsunami damage, it is necessary to consider evacuation support and evacuation actions based on tsunami arrival time. Many recent tsunami evacuation assistances only have showed the inundation area, information of evacuation site, and shortest route to evacuation sites. However, safety of routes to evacuation shelters based on the estimated inundation range and estimated tsunami arrival time has not been considered.

     Based on the earthquake information, we searched scenarios from the tsunami database that tsunami simulation results are accumulated. Then, we extracted a scenario based on search range, magnitude and estimated tsunami arrival time. We constructed an evacuation route search method to avoid tsunami encounter considering the tsunami arrival time on the evacuation route of the extracted scenario.

     We then examined the effectiveness of our proposed method at Katsuura City, Chiba Prefecture. As a result, when evacuation was started both before and after the arrival time of the tsunami, the mortality rate was reduced by selecting the route which doesn’t encounter tsunami. This implies the effectiveness of our proposed evacuation support method which can provide a safe evacuation route.

    DOI: 10.2208/kaigan.76.2_i_1249

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  • TSUNAMI-INDUCED SEDIMENT TRANSPORT SIMULATION USING BEDROCK DISTRIBUTION UNDER SEAFLOOR - CASE STUDY OF KESENNUMA BAY -

    YAMASHITA Kei, SUGAWARA Daisuke, ARIKAWA Taro, TAKAHASHI Tomoyuki, IMAMURA Fumihiko

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_427 - I_432   2020

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    Field survey of bathymetry, sediment and bedrock of the narrow in Kesennuma Bay have been investigated. Numerical simulations of tsunami-induced sediment transport during the 2011 Tohoku tsunami were also improved by using the bedrock and sediment dataset. After the tsunami, depositions at the center of the narrows, erosions at the sides and the north area, and depositions at the south area were confirmed. By utlizing the bedrock data, the reproducibility of the field modeling was improved although the erosion of the narrows was limited to the bedrock distribution. It was found that the introduction of the bedrock is important to prevent underestimation of flow velocity and topographic changes. Furthermore, the simulations with simple consideration of erosion resistance due to the geology showed that the effect of erosion resistance was small and within the range of conventional modeling. The erosion speed in the narrows was characterized during the rising and the stationary period of the Shields parameter.

    DOI: 10.2208/kaigan.76.2_i_427

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    Other Link: http://id.ndl.go.jp/bib/030806502

  • QUANTITATIVE EXAMINATION OF LIFT FORCE ACTING ON PIER BASED ON GAS-LIQUID PHASE FLOW MODEL

    OKAMOTO Daishi, OKUBO Hiroshi, KASAHARA Hirotsugu, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_787 - I_792   2020

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    Many hydraulic experiments have been carried out on the physical elucidation of lift force and shock wave pressure. In recent years, computational techniques have been developed and wave pres-sure is being studied using numerical calculations. However, there are few case studies by numerical calculation for phenomena such as lift force because it makes huge time to calculate complex wave pressures. In this study, we conducted hydraulic experiments on the pier, and compared with the cal-culations using the gas-liquid phase fluid simulation. Furthermore, we investigated the accuracy of reproducibility calculations for incompressible fluid and possibility of applying calculation to prac-tice. Although, it remains problem to reproduce the experimental values sufficiently by numerical calculation, it was possible to catch the momentum of the water mass. It is necessary to study the compression effect and the reduction of calculation cost.

    DOI: 10.2208/kaigan.76.2_i_787

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  • EXPERIMENTAL STUDY ON LOCAL SCOUR AT THE BASE OF A MONOPILE OFFSHORE WIND GENERATOR

    ARIKAWA Taro, CHEN Xiaoyue, CHEN Songgui, CHEN Hanbao, HAMACHI Katsuya, MATSUMOTO Yukihisa, TOKUNAGA Shogo, WATANABE Masashi, GEN Hayao

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_535 - I_540   2020

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    Regarding the local scour phenomenon at the base of a monopile type offshore wind power generator, although some existing formulas have been proposed, the effect of the countermeasure construction has been still unclear. In this study, we investigated the effect of countermeasure construction and conducted the reproduction of the local scour phenomenon using large-scale experiments and numerical calculations. We conducted the experiment under the condition that waves, current, and both waves and current are existed using 50 cm monopile with a scale of 1/13, then investigated the scuring depth in case that countermeasure construction was installed and not installed. As a result, it was confirmed that the countermeasure construction has a effect to reduce scaring around the monopile. We then conducted the calculation of flow around the monopile using three-dimensional numerical simulation. The computed results were consistent with the measured values, thus the validity of our simulation was confirmed. Although the scouring depth and its mechanism have not been elucidated, it is qualitatively inferred that the scouring was occurred due to the relationship with the local velocity and vorticity.

    DOI: 10.2208/kaigan.76.2_i_535

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  • DEVELOPMENT OF WAVE PREDICTION MODEL ASSIMILATED OBSERVATIONAL DATA FROM SHIPS USING ENSEMBLE KALMAN FILTER

    FUJIWARA Kazuhiro, SHIRAI Tomoki, OMIYA Tomoki, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_241 - I_246   2020

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    It has been reported that the optimal route can be used to CO2 during ship navigation, and it is important to predictthe wave field around the ship up to several hours ahead. In order to improve the avvuracy of local and short-term predictions such as the around field around ships, it is necessary to develop a mechanism to correct the prediction using ship observational data. Therefore, in this study, we constructed a data assimilation system that applies EnKF to a wave prediction model SWAN, in order to make wave predictions using real-time observational data obtained from ships. As a result, improving the accuracy of the ship position and usefulness of EnKF were shown by performing data assimilation using ship observational data. Moreover, in order to improve the accuracy in coastal area and the accuracy of the whole sea by increasing the number of observation points, we investigated the accuracy using NOWPHAS wave observational data. Compared with the estimation accuracy before data assimilation, the accuracy was improved about 27 % at the maximum.

    DOI: 10.2208/kaigan.76.2_i_241

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  • STUDY ON DRIFTING DISTANCE AND ANCHORING POSITION OF SHIPS IN TOKYO BAY AT TYPHOON NO. 15 AND 19 IN 2019

    TOKUNAGA Shogo, KUROSAWA Kazuma, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_853 - I_858   2020

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    In this study, in order to contribute to the prediction of drifting ships during a typhoon, we examined the variations of size and moving distance of ships located in Tokyo Bay during the typhoon no. 15 and 19 in 2019. As a result of AIS data analysis, moving distance of ships become long if the size of ship is small. We also conducted numerical simulation for reproducing drift of ships which reached the collision during the typhoon no. 15. But time series of ship position could not be reproduced. The averaged wind speed and direnction were reproduced well in our simulation. Thus, it is likely that local wind affects to drifting of ships. In addition, in the case of changing the anchorage position, the result was that the collision was evaded considering the drift distance and wind field at that time.

    DOI: 10.2208/kaigan.76.2_i_853

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  • INVESTIGATING DISTRIBUTION CHARACTERISTIC OF STORM BOULDERS AT OKINOSHIMA ISLAND, JAPAN BASED ON NUMERICAL MODELING

    WATANABE Masashi, SEINO Satoquo, TOKUNAGA Shogo, FUJIWARA Kazuhiro, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_1165 - I_1170   2020

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    Coastal boulders formed by past tsunami or storm waves have been reported around the world. The relationship between size of tsunami or storm wave and boulder weight is nesssary to be investigated in more cases for contributing the research of coastal boulders to future disaster prevention at coastal area. At Okinoshima, Chiba prefecture, several tones of coastal boulders were transported by storm waves during the 2019 Typhoon No. 15 (Faxai). In this study, we conduected numerical simulation of storm waves during this event in order to estimate ths size of storm wave which emplaced these boulders onto the land. As a result, we estimated that the maximum size of boulder was transported from areas that water depth is less than 9.1 m. The computed maximum wave height and velocity over the shoreline was respectively 4.7 m and 14.5 m/s. Hereinafter, by accumulating the data of boulder distribution and size of tsunami or storm wave, the estimation of past tsunami or storm wave that transported coastal boulder can be conducted in many places.

    DOI: 10.2208/kaigan.76.2_i_1165

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    Other Link: http://id.ndl.go.jp/bib/030808435

  • A STUDY OF COMPUTATION TIME AND ACCURACY OF THE PREDICTION OF STORM SURGE AND WAVES USING GLOBAL WRF MODEL

    SHIRAI Tomoki, FUJIWARA Kazuhiro, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_247 - I_252   2020

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    We conducted the prediction in case of the 2019 typhoon Hagibis to examine the accuracy of the surge and waves prediction using global WRF. We obtained the most reliable sustained maximum wind speed and peak value of surge and significant wave height in case that simulation of the typhoon was started approximate 1000 km offshore from Japan coast. The predicted maximum storm surge was underestimated because the propagation speed of typhoon was underestimated and the wind direction was different from the observation. In addition, in the real-time prediction, we have to consider computation time and computation efficiency not only prediction accuracy. However, the appropriate model configuration from this point of view hasn’t been investigated, yet. To achieve the cost-effective storm surge and waves prediction with high accuracy, the relations among prediction accuracy, computation time, and computation load should be generalized. The results of this study presented the best prediction start timing to achieve the cost-effective prediction in case of the 2019 typhoon Hagibis. More prediction cases must be accumulated to generalize the model configulations.

    DOI: 10.2208/kaigan.76.2_i_247

    DOI: 10.2208/kaigan.77.2_i_139_references_DOI_JFPhVJsMVWBwVIqHxjd5YErZwpF

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  • COASTAL FOREST MODELING IN BREAKING ZONE BASED ON 3D NUMERICAL WAVE TANK

    TADOKORO Ayaka, WATANABE Masashi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   76 ( 2 )   I_955 - I_960   2020

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    In this study, in order to validate the modeling of coastal forest within surf zone based using the three dimensional simulation, the simulation results and experimental values were compared. Laboratory experiments for revealing attenuation of wave height due to coastal forest has been conducted. After the validation of our numerical simulation, drag and inertial coefficients were estimated. It was confirmed that the trend of the both coefficients characterized by Keulegan-Carpenter and Reynolds number are consistent with the results estimated by the previous study.

    DOI: 10.2208/kaigan.76.2_i_955

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  • インドネシアスンダ海峡で発生した火山性津波について

    今村 文彦, Abdul Muhari, 有川 太郎

    津波工学研究報告 = Tsunami engineering = research report of tsunami engineering / 東北大学災害科学国際研究所(津波工学研究分野) 編   ( 36 )   27 - 31   2019.7

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  • 2018 Typhoon Jebi post-event survey of coastal damage in the Kansai Region, Japan Reviewed

    Nobuhito Mori, Tomohiro Yasuda, Taro Arikawa, Tomoya Kataoka, Sota Nakajo, Kojiro Suzuki, Yusuke Yamanaka, Adrean Webb

    Coastal Engineering Journal   61 ( 3 )   278 - 294   2019.5

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    Typhoon Jebi in 2018 caused severe damage along areas of Osaka Bay, Japan. After the storm, a Japan Society of Civil Engineers (JSCE) coastal survey group surveyed the coastal impacts and recorded watermarks inside Osaka Bay and along the Pacific. The maximum storm tide recorded by a tide gauge was 3.29 m at the Osaka Tide Station, which is a historical high for Osaka Bay. Coastal flooding consisted of both storm surge and wave run-up in almost all locations, with flooding exceeding 5 m and 12 m in elevation from mean sea level in the inner parts of Osaka Bay and along the Pacific coast, respectively. Coastal damage was severe in areas located outside of coastal barriers, such as ports and harbors, while residential areas were mainly well protected and spared due to coastal protection systems. In addition, some inland flooding occurred in the Kobe-Ashiya regions due to the storm surge propagating up several small rivers. This survey report summarizes the findings of the post-event survey by JSCE and analyzes the relation between maximum water level and resulting damage.

    DOI: 10.1080/21664250.2019.1619253

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  • Hurricanes Irma and Maria post-event survey in US Virgin Islands

    Daniel Cox, Taro Arikawa, Andre Barbosa, Greg Guannel, Daisuke Inazu, Andrew Kennedy, Yue Li, Nobuhito Mori, Kwasi Perry, David Prevatt, David Roueche, Takenori Shimozono, Chase Simpson, Eisuke Shimakawa, Tomoya Shimura, Richard Slocum

    Coastal Engineering Journal   61 ( 2 )   121 - 134   2019.4

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    Hurricanes Irma and Maria caused catastrophic damages across the Caribbean Islands during the 2017 hurricane season. After the storms, a joint United States-Japanese team investigated coastal impacts in the US Virgin Islands, which are composed of the islands of St. Thomas, St. John, Water Island, and St. Croix. Coastal inundation was dominated by wave run-up in almost all locations, with many locations showing inundation exceeding 4-m elevation from mean sea level. In contrast, maximum elevations recorded at tide gauges did not exceed 1 m at any location. Coastal damage was relatively minor for such strong hurricanes because of the lack of heavy development at low elevations on the most exposed coastlines. Many moored vessels were destroyed, and coastal structures and infrastructure within the inundation region suffered significant damage. However, few large structures experienced catastrophic losses from coastal inundation. In contrast, strong winds caused extensive structural damage throughout the US Territory. Evidence was seen for past inundation of the coastline, but could not be conclusively linked to any particular events.

    DOI: 10.1080/21664250.2018.1558920

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  • INFLUENCE OF SCALING EFFECT FOR SAND LEAKAGE INTO THE MOUND OF WAVE DISSIPATING BLOCKS

    CHEN Syaoyue, SUZUKI Kohei, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_547 - I_552   2019

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    In this research, a laboratory experiment of sand leakage into the mound of wave dissipating blocks was conducted in the scale of 1/100.

     Afterwards, the result was compared with the large-scale experiments conducted in previous studies. However, sand leakage observed differed considerably between the different scale experiments; sand leakage in the large scale was not generated in the laboratory experiment. Moreover, from further research, it was revealed that the ratio of grain sizes to sand layer of the mound is a significant parameter for sand leakage to occur.

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  • TRANSITION OF HYDRAULIC MODEL EXPERIMENT FACILITIES IN RECENT YEARS

    HASEGAWA Iwao, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   75 ( 2 )   I_349 - I_354   2019

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    In recent years, sea conditions are becoming severe due to climate change. In addition, it is required to cope with the action of multiple forces. There are cases where the conventional hydraulic model experiment facilities can not cope with these changes in the situation in recent years. Therefore, it is intended to organize the existing hydraulic model experiment facility and propose a hydraulic model experiment facility to clarify the mechanism of response to climate change and complex disasters.

    DOI: 10.2208/jscejoe.75.i_349

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  • TIME SERIES OF SCOUR DEPTH BEHIND VERTICAL SEAWALL DUE TO OVERFLOW

    SUZUKI Kohei, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_715 - I_720   2019

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    As a result of the Great East Japan Earthquake, coastal structures were submerged by the tsunami. Part of these structures were scoured, resulting in a reduction of the bearing capacity of these structures. As a result, some caissons were moved and some of them were collapsed, although the actual tsunami water depth did not exceed the threshold which can slide the caisson. For designing of a robust structure, the investigation of the influence against scours behind the seawall due to tsunami is important. Although many studies has conducted the estimation of the maximum scour depth, few studies actually have investigated the relationship between overflow time and scour depth.Therefore, the purpose of this study is to design an experimental equation that can evaluate the time evolution of scour depth.

    DOI: 10.2208/kaigan.75.i_715

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  • REPRODUCTION ANALYSIS OF VESSELS DRIFTING DUE TO TYPHOON JEBI USING EMPIRICAL TYPHOON MODEL

    TOKUNAGA Shogo, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_301 - I_306   2019

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    In this study, we simulated the drifting of vessels during the 2018 typhoon JEBI that attacked on the Kinki region on September 4, 2018 for future prediction of vessel drifting by typhoon. For the simulation, the wind field of the typhoon was created using an empirical model. The wind speed and direction in the simulation are calibrated with the observed values. Then, we examined the wind direction due to difference in deflection angle of typhoon. The wind direction was also adjusted to fit with the tracks of the vessels, then wind acts on the vessels was calculated. As a result, the calculated drifting direction and distance of the vessels were consistet with the observed ones. The calculated drifting speed was approximately reproduced well, but some discrepancies between calculated and observed values were confirmed.

    DOI: 10.2208/kaigan.75.i_301

    DOI: 10.2208/kaigan.76.2_i_853_references_DOI_AVHEFg1Fp3U8Bv028hU4m0isOV5

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  • Overview of Storm Surge and Storm Wave Damages in TC Jebi

    MORI Nobuhito, NAKAJO Sota, YASUDA Tomohiro, KATAOKA Tomoya, SUZUKI Kojiro, ARIKAWA Taro

    Wind Engineers, JAWE   44 ( 3 )   288 - 293   2019

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  • 近年における水理模型実験施設の変遷—TRANSITION OF HYDRAULIC MODEL EXPERIMENT FACILITIES IN RECENT YEARS

    長谷川 巌, 有川 太郎

    海洋開発シンポジウム講演集   44   6p   2019

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  • HINDCASTING THE STORM SURGE DURING THE 2017 HURRICANE IRMA ON MINOR ISLANDS

    HAGA Takuto, FUJIWARA Kazuhiro, SEKI Katsumi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_259 - I_264   2019

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    A combination of quasi three-dimensional and three-dimensional models is required for reasonable and rapid real-time storm surge forecasting. It is also important to clarify the adaptability conditions of quasi three-dimensional and three-dimensional models. However, there are few studies which examined the adaptability conditions on minor islands because the possibility of storm surge disaster at these islands is quite low compared to the inner bay. In this study, we examined the applicability of quasi three-dimensional and three-dimensional models during the 2017 Hurricane Irma which caused storm surges around Caribbean Sea. We also examined the accuracy of computed three-dimensional velocity induced by its hurricane passage. As a result, it was clarified that three-dimensional model is necessary for modeling storm surge on minor islands. This is because the multi-layered cells contribute to the propagation of storm surge when water depth become small. The computed storm tide become high due to the wind set-up around the island area, but this storm tide caused by wind set-up effect can be estimated properly using three-dimensional model.

    DOI: 10.2208/kaigan.75.i_259

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  • PROTECTIVE PERFORMANCE OF MOVABLE BREAKWATERS AGAINST STORM SURGE AND TSUNAMI

    ARIKAWA Taro, KAWAI Koki, TOKUNAGA Shogo, SEKI Katsumi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_805 - I_810   2019

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    In this research, the protective performance of the movable breakwater with gap against the long waves like storm surge was examined by physical experiment and numerical simulations. In the hydraulic experiments, the characteristics of the flow through the gap were clarified using the steady flow. The results indicated that the apparent gap was different between cylinders and pipes and was in propotion to the water level difference. Next, the evaluation method by using the numerical simulations were verified to apply to the ports with complex shape using a real-scale virtual water channel. According to the results, the protection performance was affected by the size of the port and the height of waves and could be estimated by the rough estimation method.

    DOI: 10.2208/kaigan.75.i_805

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  • EXAMINATION FOR EVALUATION METHOD OF COLLISION PROBABILITY OF TSUNAMI DEBRIS USING NUMERICAL CALCULATION

    MURASE Fumiya, TERAMOTO Naruta, TOYODA Atsushi, TANAKA Yoshihito, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_439 - I_444   2019

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    In considering the secondary damage of a tsunami, it is important to consider whether a container placed in a port will collide with structures behind in the run-up tsunami wave. Therefore, we conducted a hydraulic experiment to investigate the behavior of tsunami debris due to the run-up wave. As a result, not only the run-up wave but also the reflected wave generated by the structure behind was important that we examine the drift of the tsunami debris. Therefore, we examined the influence of the impinging distance into the the reflected wave on the drift behavior by changing the initial position, initial angle, and weight of the tsunami debris. We confirmed that the impinging distance into the reflected wave had a significant effect on the impinging speed of the reflected wave, the collision speed at the reflection wall, and the probability of collision at the reflection wall. The probability of collision decreased because the impinging distance into the reflected wave increased as the distance from the initial placement of the tsunami debris to the reflection wall increased. Furthermore, when numerical calculations were used to perform analysis for a part of the experiment, the results were almost consistent with the results of the experiment.

    DOI: 10.2208/kaigan.75.i_439

    DOI: 10.3390/jmse9050493_references_DOI_5dzxMYHkbvCBAmSg72PH5FNsGZs

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  • STUDY ON REFLECTION COEFFICIENT AT WAVE DISSIPATING STRUCTURE USING NUMERICAL MODELING

    OKAJIMA Riku, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_775 - I_780   2019

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    To evaluate the performance of wave dissipation structure, cross-sectional experiments has been performed to measure the reflectance coefficient. However, this method is insufficient, because waves sometimes propagate to a dissipating wave structure in the oblique direction. In constant, in an experiment using a plane water tank, multiple reflections of waves are generated. Thus measuring the flow velocity and wave height is difficult, so that. The experimental conditions that can be examined are limited. Therefore, we studied the oblique incident based on numerical calculation. The results of numerical calculation were generally consistent with the measured values in our experiment. Thus, it is expected that overtopping at oblique incidence using numerical calculation in the future.

    DOI: 10.2208/kaigan.75.i_775

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  • STUDY ON EVACUATION INDUCTION DURING TSUNAMI DISASTER AND REGIONAL VULNERABILITY ASSESSMENT

    SAKATA Yusuke, YAMAMOTO Masato, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_1357 - I_1362   2019

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    We focused on the information of tsunami inundation and GIS obtained before the initiation of evacuation in order to evacuate evacuees to evacuation facilities smoothly. In this study, we examined effects of prior information of tsunami arrival time and road blockage against the evacuation. Moreover, we evaluated the vulnerability of the city against tsunami based on the heavily-used route and the death rate at evacuation start position. By giving tsunami inundation information and GIS information to the evacuees as prior information, evacuation without death due to a tsunami encounter and re-searching road due to its blockage were suceeded. We conducted the simulation using this method at Nakatosa, Kouchi prefecture, then confirmed that the dearh rate of evacuees which started evacuation immediately after the tsunami arrival time was reduced. Moreover, using our method, we revealed that there are differences in use rate of evacuation route. We also confirmed that death rate become high in the areas that many road obstructions are existed.

    DOI: 10.2208/kaigan.75.i_1357

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  • POTENTIAL IMPACT OF TSUNAMI-INDUCED SEDIMENT TRANSPORT IN KOCHI PREFECTURE CAUSED BY THE NANKAI TROUGH MEGATHRUST EARTHQUAKE

    YAMASHITA Kei, SUGAWARA Daisuke, SETO Shuji, ARIKAWA Taro, TAKAHASHI Tomoyuki, IMAMURA Fumihiko

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   75 ( 2 )   I_685 - I_690   2019

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    In order to evaluate coastal geomorphic changes and potential impacts of tsunami-induced sediment transport in Kochi Prefecture caused by the Nankai Trough megathrust earthquake, numerical simulations of sediment transport over a wide area of Tosa Bay have been performed. The regional features of potential impact was provided. The tsunami-induced sediment transport can cause not only large-scale erosion and sedimentation around the coastal zone but also increase in tsunami hazards. Note that the influences depend significantly on uncertainties in bed materials, i.e. grain sizes and distributions of erodible/noerodible surfaces. The uncertainties in the simulations will be improved through acquisition of detailed sedimentary data. Further discussions considering the regional characteristics of tsunami-induced sediment transport will provide the resilient countermeasures to tsunami disaster.

    DOI: 10.2208/kaigan.75.i_685

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    Other Link: http://id.ndl.go.jp/bib/030112177

  • 事故・災害 2018年台風21号Jebiによる沿岸災害調査報告—Natural Disasters and Their Damages : Report on Coastal Damage due to Typhoon Jebi on September 4, 2018

    森 信人, 安田 誠宏, 中條 壮大, 片岡 智哉, 鈴木 高二朗, 有川 太郎

    土木学会誌   103 ( 12 )   34 - 37   2018.12

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  • Post Disaster Survey of Hurricane Irma and Maria in 2017 in US Virgin Islands

    SHIMURA, Tomoya, SHIMOZONO, Takenori, ARIKAWA, Taro, INAZU, Daisuke

    Disaster Prevention Research Institute Annuals. A   61 ( A )   42 - 45   2018.9

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    Two category 5 hurricanes were passed near US Virgin Islands in the summer of 2017. The post-disaster survey of Hurricane Irma and Maria in 2017 was conducted by Japan-US joint survey team in US Virgin Islands (USVI). The severe coastal damage including inland inundation, wave run-up and wind induced damage was observed in three islands of St. Thomas, St. John and St. Croix in USVI.

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    Other Link: http://hdl.handle.net/2433/235765

  • (40) 地震後に津波波力を受けるピロティ建物の応答性状

    壁谷澤 寿一, 壁谷澤 寿海, 有川 太郎

    構造工学論文集.B   ( 64 )   351 - 356   2018.3

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  • Hurricanes Irma/Maria in the USVI: Joint JSCE-NSF field reconnaissance and the use of UAVs for geospatial disaster data

    Dan Cox, Andre Barbosa, Greg Guannel, Andrew Kennedy, Chase Simpson, Richie Slocum, Nobuhito Mori, Taro Arikawa, Daisuke Inazu, Tomoya Shimura, Takenori Shimozono, Tracy Kijewski-Correa, Chris Parrish

    Proceedings of the Coastal Engineering Conference   36 ( 2018 )   2018

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    © 2018 American Society of Civil Engineers (ASCE). All rights reserved. ♦ Overall Goals ■ Successful mission to document Irma/Maria storm surge in USVI ■ Documented several examples of damage to built environment ♦ Drone survey data ■ Qualitative data o relatively cheap, easy o requires some planning ■ Quantitative data o Requires additional equipment & time for ground control points o Requires post processing, expertise ♦ Data sharing (images) ■ Phone apps (eg FULCRUM) o relatively cheap, easy o requires cell/internet eventually o Excellent for short metadata description, geolocation

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  • Solving the Puzzle of the September 2018 Palu, Indonesia, Tsunami Mystery: Clues from the Tsunami Waveform and the Initial Field Survey Data

    Abdul Muhari, Fumihiko Imamura, Taro Arikawa, Aradea R. Hakim, Bagus Afriyanto

    JOURNAL OF DISASTER RESEARCH   13   2018

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    On September 28, 2018, following a magnitude 7.5 strike-slip fault earthquake, an unexpected tsunami inundated the coast of Palu bay, Sulawesi, Indonesia, causing many casualties and extensive property damage. However, the earthquake's mechanism rarely generates a destructive tsunami. The tidal record at Pantoloan, located along the coast of Palu bay, indicates that the tsunami arrived 6 min after the earthquake and generated 2 m of receding water. It had a maximum wave height of 2 m and arrived approximately 2 min later. The tsunami had a relatively short period and caused devastation as far inland as 300 m. Additionally, 8 m high watermarks were observed near the coast; the flow depth decreased to 3.5 m inland (Fig. 1). Amateur videos and eyewitness accounts indicate that the tsunami did not enter the bay through its mouth but obliquely from an area inside the bay. Our hypothesis, therefore, is that the killer tsunami was most likely generated by an underwater landslide occurring inside Palu bay. While detailed bathymetric data are still needed to confirm this hypothesis, in this article we provide a preliminary analysis of the available data, supported by the results of a field survey, to strengthen this hypothesis and provide direction for further post-tsunami surveys and analysis.

    DOI: 10.20965/jdr.2018.sc20181108

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  • 地震後に津波波力を受けるピロティ建物の応答性状 Reviewed

    壁谷澤 寿一, 壁谷澤 寿海, 有川 太郎

    構造工学論文集   64   793 - 798   2018

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  • 防護施設のフラジリティを用いた津波浸水計算手法の適用性に関する研究

    有川 太郎

    第15回日本地震工学シンポジウム論文集   OS3   1 - 6   2018

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  • CONSIDERATION ON ACCURACY AND COMPUTATIONAL EFFICIENCY OF GAS-LIQUID TWO-PHASE FLUID SIMULATION AGAINST TSUNAMI BORE FORCE

    ARIKAWA Taro, IGARASHI Hiromu

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   74 ( 2 )   I_1039 - I_1044   2018

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    In this research, the accuracy and computational efficiency of gas-liquid two-phase fluid simulation were focused. For the estimation of the impulsive force acting on the upright wall, calculation precision was improved by applying a complete windward difference to the gas phase region and a difference scheme corresponding to the volume fraction of the fluid of each element in the gas-liquid mixture region. For computational efficiency, the computation time was reduced by eliminating the dependency between elements during forward substitution and backward substitution processing in the matrix solution and hybrid parallelizing it together with region segmentation method.

    DOI: 10.2208/kaigan.74.i_1039

    DOI: 10.2208/kaigan.76.2_i_787_references_DOI_EWkitiCbHVR8YE9EQQhGbZE5Uxu

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    Other Link: http://id.ndl.go.jp/bib/029326965

  • IMPROVEMENT OF TSUNAMI-INDUCED SEDIMENT TRANSPORT MODEL BY CONSIDERING SATURATED CONCENTRATION IN SUSPENSION WITH STRONG UNSTEADY FLOWS

    YAMASHITA Kei, SUGAWARA Daisuke, ARIKAWA Taro, SHIGIHARA Yoshinori, TAKAHASHI Tomoyuki, IMAMURA Fumihiko

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   74 ( 2 )   I_325 - I_330   2018

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    In this study, factors causing the underestimation of morphological changes due to tsunami-induced sediment transport in Kesennuma Bay with narrows during the Great East Japan Earthquake and Tsunami have been numerically investigaed. Based on the estimation, the saturated concentration of suspention model was improved. It was found out that strong unsdeady flows occerred at narrows. The numerical results from conventional saturated concentration model implied that at the narrows, suspension concentration and sediment supply from the bottom to the suspension were limited by high concentration in suspension, leading to underestimation of morphological change, i.e., erosion and deposition. By considering effects of strong unsteady flows on concentration of suspention, a new form of saturated concentration model based on log-wake law and Kármán constant theory has been proposed. Numerical results of the erosion and deposition in Kesennuma Bay were improved. It is expected that accuracy of evaluation about not only morphological changes but also inundation area and damages are improved.

    DOI: 10.2208/kaigan.74.i_325

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    Other Link: http://id.ndl.go.jp/bib/029324989

  • DEVELOPMENT OF EVACUATION ROUTE SELECTION METHOD DEPENDING ON THE LEVEL OF TSUNAMI

    SAKATA Yusuke, HIRANO Hiroaki, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   74 ( 2 )   I_397 - I_402   2018

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    In this study, we conducted inundation calculation of multiple tsunami sources with tsunami simulation and constructed the database of tsunami arrival times considering uncertainty of tsunami sources and aimed to propose a method to search evacuation routes not encountering the tsunami. The tsunami risk on evacuation route calculated by tsunami database, and evacuation behavior to select evacuation route that does not encounter the tsunami was incorporated into multi agent simulation. As a result, the method of selecting a route that does not encounter the tsunami during the evacuation behavior was established by changing the moving direction to the direction of the shortest distance of another evacuation shelter when there is a possibility of encountering a tsunami during the evacuation behavior calculated from the degree of danger. The area was simulated by this method, and confirmed that the mortality rate was reduced.

    DOI: 10.2208/kaigan.74.i_397

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    Other Link: http://id.ndl.go.jp/bib/029325096

  • Numerical modeling of short and long term waves and surges by Hurricane Irma and maria in US Virgin Islands

    Nobuhito Mori, Takenori Shimozono, Taro Arikawa, Daisuke Inazu, Tomoya Shimura, Andrew Kennedy, Daniel Cox

    Proceedings of the Coastal Engineering Conference   36 ( 2018 )   2018

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  • STUDY ON RESIDUAL HORIZONTAL DISPLACEMENT TO A BREAKWATER BY THE COMPOUND OF EARTHQUAKE AND OVERFLOW TSUNAMI

    OKADA Katsuhiro, SUZUKI Kojiro, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   73 ( 4 )   I_479 - I_486   2017

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    The recent 2011 off the Pacific coast of Tohoku Earthquake earthquake and tsunami generated huge tsunamis, and many protective facilities were destroyed. Most of the damage was caused by tsunami overflow. After a main shock occurred, many aftershocks occurred. As for the possibility that a structure suffered from by the superposition phenomenon of an earthquake and the tsunami, it is thought. A large-scale hydraulic model experiment was conducted to confirm it about the influence on breakwater in the superposition of an earthquake and the tsunami, and residual horizontal displacement. In superposition of an earthquake and the tsunami of the breakwater, it was affected by the tsunami and confirmed that different residual displacement was produced only in the case of an earthquake. As a result, at an earthquake and the compound action of tsunami overflow, it clarified that there was a tendency to reduction effect of the acceleration and increase of the horizontal displacement.

    DOI: 10.2208/jscejseee.73.i_479

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  • STUDY ON VERIFICATION OF PORE WATER PRESSURE IN STATE OF RAISING UP WATER LEVEL USING FLUID AND SOIL WEAK COUPLING MODEL

    OHKI Yuki, KUSANO Mizuki, SEKI Katsumi, TAENAKA Shinji, MORIYASU Shunsuke, DEJI Takeji, UEDA Hideki, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_1111 - I_1116   2017

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    In this study, we applyed Dupuit-Forcheimer's law to the processing of the fluid side porosity of CADMAS-STR. The result were compared with the result of physical experiments. It was found that the calculation and the experiment result showed consistent value for the seepage flow velocity under the sheet pile. The validity of this method was therefore confirmed. In addition, pore water pressure was consistent with the calculation and the experiment. From this result, it was found that reproducing the seepage flow velocity by applying Dupuit-Forchheimer's law, it is possible to estimate pore water pressure exerted by underground water.

    DOI: 10.2208/kaigan.73.i_1111

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  • STUDY ON SAFETY EVALUATION OF SEISMIC ISOLATION STRUCTURE FOR WATER CYCLE FACILITY AGAINST EARTHQUAKE MOTION AND TSUNAMI

    ARIGA Yoshiaki, SATO Yuno, WATANABE Takashi, NISHIMOTO Yasusi, CAO Zengyan, SAKASHITA Katsuyuki, SUZUKI Koujiro, ARIKAWA Taro, ASAI Mitsuteru, HORI Muneo

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   73 ( 4 )   I_721 - I_729   2017

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    Water cycle facilities are usually constructed at coastal area because of sewage collecting system by gravity flow. So, seismic performance against not only earthquake motion but also tunami should be secured. In this study, we have proposed isolation structural method against strong earthquake motion and wave force of tsunami by utilizing asphaltic viscous fluid isolator. Effectiveness of the proposed method was examined by three-dimentional FEM analyses. As a result, it is considered that stress within the structure induced by earthqauke motion and tsunami can be largely reduced by buffer effect of isolator.

    DOI: 10.2208/jscejseee.73.i_721

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  • DEVELOPMENT OF TSUNAMI INUNDATION EVALUATION METHOD USING FRAGIRITY CURVE

    ARIKAWA Taro, SEKI Katsumi, SHIMOSAKO Kenichiro, TAKAGAWA Tomohiro, CHIDA Yu

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_337 - I_342   2017

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    The purpose of this study is to clarify the effect of different protective facility damage levels on tsunami inundation. We developed a method to evaluate tsunami inundation using a fragility curve that represents the relationship between tsunami height and facility damage levels. The adequate results were obtained as the results of carrying out the test calculation and the real scale calculation. In addition, because comparisons of the calculation result actually lowered the top end height of the protective facility, it was found that the result is similar to the reduction of the top end height by about 30%.

    DOI: 10.2208/kaigan.73.i_337

    DOI: 10.20965/jdr.2019.p0212_references_DOI_Q5rUNnGmfsPJoNS2Pk6V5GjTPKW

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  • 衝撃波力に対する鉄筋コンクリート造構造物の応答に関する検討 Reviewed

    壁谷澤 寿一, 壁谷澤 寿海, 有川 太郎

    コンクリート工学年次論文集   39   793 - 798   2017

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  • PROTECTION PERFORMANCE AGAINST STORM SURGE DUE TO VERTICAL TELESCOPIC BREAKWATER

    KAWAI Koki, SEKI Katsumi, KOBAYASHI Makoto, OOKAWA Taiichi, INOUE Hiroshi, KIHARA Kazuyoshi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_235 - I_240   2017

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    The purpose of this study is to clarify how much vertical telescopic breakwater affects water level reduction in the event of a storm surge for the development of an evaluation method by using CADMAS-SURF/3D and STOC-ML. The velocity flow between the breakwaters corresponds to the theoretical value, which is evaluated based on water level difference. Therefore, the result indicates that the aperture can be reduced by around 1.0% when analyzing the breakwater with 7.2% aperture using STOC-ML. Because of this study, it is possible to obtain approximate water level reduction using dimensionless quantities including the conditions of wave, breakwater, and harbor.

    DOI: 10.2208/kaigan.73.i_235

    DOI: 10.2208/kaigan.77.2_i_823_references_DOI_1QRvVG27x6VSuRYsKwPcMkCUaTB

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  • ESTABLISHMENT OF ROUTE SELECTION METHOD DEPENDING ON THE DANGER LEVEL OF THE EVACUATION ROUTE AND TSUNAMI DIFFERENT SCALE

    HIRANO Hiroaki, KOYANAGI Yuki, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_1501 - I_1506   2017

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    In this study, the tsunami risk on evacuation route calculated by calculating tsunami behaviors of relatively large scale using the tsunami simulation in advance, and evacuation behavior to select evacuation route that does not encounter the tsunami was incorporated into multi agent simulation. As a result, the method of selecting a route that does not encounter the tsunami during the evacuation behavior was established by changing the moving direction to the direction of the shortest distance of another evacuation shelter when there is a possibility of encountering a tsunami during the evacuation behavior calculated from the degree of danger. The area was simulated by this method, and confirmed that the mortality rate was reduced.

    DOI: 10.2208/kaigan.73.i_1501

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  • VERIFICATION OF HINDCASTING FOR HIGH WAVE AND STORM SURGE BY GSM DATA SET

    HAGA Takuto, SEKI Katsumi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_145 - I_150   2017

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    GSM (Global Spectral Model). A climate distribution data set by JMA (Japan Meteorological Agency) is applied to the wave and storm surge estimation for explosive cyclones and typhoons. Wind and atmospheric pressure conditions for the wave and storm surge estimation are obtained using two methods involving the GSM data set. One way is that the GSM data set is linearly interpolated while another is an empirical typhoon model based on the data set. The main results are summarized as follows; when linear interpolation is used in estimations of meteorological fields, it shows high correlation with long-term waves due to bomb low pressure. On the other hand, when using a typhoon model to estimate the weather field, it was confirmed that this method yields high accuracy to the peak value of local typhoon-generated waves.

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    Other Link: http://id.ndl.go.jp/bib/028749121

  • EFFECT OF SEDIMENT TRANSPORT ON TSUNAMI HAZARD AND BUILDING DAMAGE – AN INTEGRATED SIMULATION OF TSUNAMI INUDATION, SEDIMENT TRANSPORT AND DRIFTING VESSELS IN KESENNUMA CITY, MIYAGI PREFECTURE DURING THE GREAT EAST JAPAN EARTHQUAKE –

    YAMASHITA Kei, SHIGIHARA Yoshinori, SUGAWARA Daisuke, ARIKAWA Taro, TAKAHASHI Tomoyuki, IMAMURA Fumihiko

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_355 - I_360   2017

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    An integrated tsunami model consisting of models for simulating tsunami inundation, drifting objects and sediment transport, was newly developed to evaluate the effects of these multiple phenomena. A scenario of complex tsunami damage enlargement in a bay with bottleneck was revealed. The tsunami hazards in Kesennuma City, especially at the inner part of the bay such as Shishiori area, were enlarged by erosion in the bottleneck of the bay. The bathymetric change increased the drift distance of the drifting vessels. In addition, through the tsunami fragility functions based on dataset of actual damaged building and numerical results, it was evaluated that the 200 - 1,800 wooden buildings were washed away owing to sediment transport. Furthermore, it is found that the estimation accuracy of damage scale by the conventional fragility functions was suitable, although the estimated building damage near the sea and inland was under and overestimated, respectively.

    DOI: 10.2208/kaigan.73.i_355

    DOI: 10.20965/jdr.2021.p1045_references_DOI_7SXqLFNp3AF7qbdA57XejQHBmTV

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  • DEVELOPMENT OF HIGH PRECISION TSUNAMI RUNUP CALCULATION METHOD COUPLED WITH STRUCTURE ANALYSIS

    ARIKAWA Taro, SEKI Katsumi, OKI Yuki, HIRANO Hiroaki, CHIDA Yu, ARAKI Kazuhiro, ISHII Ko-ichi, TAKAGAWA Tomohiro, SHIMOSAKO Kenichiro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_325 - I_330   2017

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    The purpose of this research is to develop STOC-CADMAS-STR system, which is numerical fluid simulator coupling with the structure analysis to efficiently calculate all stages from tsunami source to runup including the deformation of structures. We also investigated the stability of breakwaters at K port. The numerical results were compared with the physical experiments. It was good agreement with the experimental ones. Finally, the system applied to the local situation at K port to verify its applicability. The most breakwaters were washed away, whose situation was similar to the damage at K port.

    DOI: 10.2208/kaigan.73.i_325

    DOI: 10.2208/kaigan.77.2_i_19_references_DOI_BLL0izHVRQlmk2VVHfXuOhjJLuG

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    Other Link: http://id.ndl.go.jp/bib/028749582

  • INFLUENCE OF SHAKING FREQUENCY ON A BREAKEWATER DURING EARTHQUAKE AND TSUNAMI SUPERPOSITION

    OKADA Katsuhiro, SUZUKI Kojiro, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_1003 - I_1008   2017

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    In subduction-zone earthquakes, which cause a tsunami, it is considered that the influence of aftershocks may act on a breakwater even when wave-overtopping is taking place. However, it is unclear what effect the superposition of earthquake and tsunami will have on breakwaters. In this study, a large hydroflume capable of reproducing the superposition phenomenon of earthquake and tsunami was used. The study revealed the influence due to frequency difference and the difference depending on the presence or absence of deformation of the mound.

    DOI: 10.2208/kaigan.73.i_1003

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  • STUDY ON EVACUATION BEHAVIOR OF IQUIQUE RESIDENTS FOR IQUIQUE EARTHQUAKE OCCURRED IN 2014

    IKEDA Makoto, ASAI Koji, MURAKAMI Hitomi, TAKAHASHI Masato, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. F6 (Safety Problem)   73 ( 1 )   92 - 101   2017

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    The evacuation behavior of residents in times of earthquake and tsunami is influenced by many factors, including knowledge in disaster prevention, participation in disaster prevention activities, and sensory experience of earthquake shaking. Using survey questionnaire to investigate the evacuation behavior of residents in Iquique during the 2014 Iquique Earthquakes in Chile, this study found that the sensory experience of earthquake shaking is the main factor that prompted residents to evacuate. However it was difficult for elderly persons to evacuate due to shortage of disaster risk. Moreover, the study also found that the location, where the residents live, is an important factor for evacuation. On the other hand, hazard map was found to have little influence on decision of residents to evacuate.

    DOI: 10.2208/jscejsp.73.92

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  • DEVELOPMENT OF PARTICLE-BASED NUMERICAL WAVE FLUME FOR MULTIPHASE FLOW SIMULATION

    GOTOH Hitoshi, SUZUKI Kojiro, IKARI Hiroyuki, ARIKAWA Taro, KHAYYER Abbas, TSURUTA Naoki

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   73 ( 2 )   I_25 - I_30   2017

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    In recent years, a numerical design for the coastal engineering problem, namely, the so-called numerical wave flume is widely used and expected to expand its potential more as an ancillary or substitute tool for hydraulic experiments. However, for the time being, the numerical wave flume is limited in versatility for the actual engineering problems as the request level of coastal designs is increasing. In this study, a numerical wave flume based on the accurate particle method with a DEM coupling model, namely, parisphere is newly developed for accurate and stable simulations of the violent free-surface multiphase flows. First, a simple benchmark is performed by targeting a sedimentation of heavier particles in the water to examine the numerical accuracy of the model. The parisphere shows a good reproducibility in the motions of particles with an improvement of the energy conservation. Second, a simulation of a complex damaging process of a breakwater, which includes solid-liquid multiphase flows, is implemented. By comparing with the experimental results, it is found that parisphere can reproduces the complex phenomenon with satisfying the prudent requirements, that is, expression of solid-solid/solid-liquid interactions, porosity of the mound, drifting of rigid bodies and accurate pressure distributions.

    DOI: 10.2208/kaigan.73.i_25

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  • (26) 構造物の崩壊荷重に基づく津波荷重の評価法に関する研究

    壁谷澤 寿一, 壁谷澤 寿海, 有川 太郎

    構造工学論文集.B   ( 62 )   197 - 202   2016.3

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  • A Coupling Simulation Between Soil Scour and Seepage Flow by Using a Stabilized ISPH Method Reviewed

    Tomotaka Nogami, Mitsuteru Asai, Kiyonobu Kasama, Taro Arikawa

    3RD INTERNATIONAL CONFERENCE ON CIVIL AND ENVIRONMENTAL ENGINEERING FOR SUSTAINABILITY (ICONCEES 2015)   47   2016.1

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    In 2011, the example that breakwaters collapsed because of the basic ground's destabilization was reported by Tohoku-Kanto earthquake tsunami. Fluid-Structure-Soil coupling simulation is desired for a systematic comprehension of the breakwater collapse mechanism, and it may help to develop next disaster prevention method. In this study, A particle simulation tool based on the SPH has been modified and improved to analyze seepage flow and soil scouring. In seepage flow analysis, as a first step, this simulation treat the surface flow and seepage flow interactions by using governing equation. In the scouring analysis, soil scour is judged by an empirical criteria based on quicksand quantity formula.

    DOI: 10.1051/matecconf/20164703019

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  • Consideration concerning the influence on a breakwater in the superposition of earthquake and tsunami

    Katsuhiro Okada, Kojiro Suzuki, Taro Arikawa

    Proceedings of the Coastal Engineering Conference   35   2016

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    When a major earthquake occurs, it can be followed by an incoming tsunami, both of which destroy many structures and cause serious damage. Although the destruction of structures caused by earthquakes and by tsunamis has been studied, the further damage caused by aftershocks after a major earthquake occurring at the time of a tsunami has not been sufficiently reported. In this study, we aimed to determine variations in the influence of different structural shapes when the effects of an earthquake and tsunami are superposed. A sloping structure was shown to reduce the hydrodynamic pressure; even when an earthquake and tsunami occur simultaneously.

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  • 構造物の崩壊荷重に基づく津波荷重の評価法に関する研究 Reviewed

    壁谷澤 寿一, 壁谷澤 寿海, 有川 太郎

    構造工学論文集   62B   1 - 6   2016

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  • STUDY OF A FORCE TO ACT ON A BREAKWATER AT THE SUPERPOSITION OF AN EARTHQUAKE AND THE TSUNAMI

    OKADA Katsuhiro, SUZUKI Kojiro, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_1057 - I_1062   2016

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    The recent 2011 off the Pacific coast of Tohoku Earthquake earthquake and tsunami generated huge tsunamis, and many protective facilities were destroyed. Most of the damage was caused by the tsunami overflow. On the other hand, many aftershocks occurred after the main shock and attacked the coastal facilities combined with tsunami. In order to clarify the superposition phenomenon of an earthquake and the tsunami, large haydraulic experiments were conducted. As a result, it was clarified that the hydraulic pressure acting on the caisson is basically expressed as a superposition pressure of earthquake and tsunami.

    DOI: 10.2208/kaigan.72.i_1057

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  • EFFECT ON SCOUR DEPTH OF FALLING HEIGHT OF OVERFLOW

    ARIKAWA Taro, UEDA Sayuri, IGARASHI Hiromu, SEKI Katsumi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_1087 - I_1092   2016

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    The purpose of this study is to clarify the effect of the overflow falling height on the scour depth using physical experiments. Small-scale physical experiments were performed. The results indicate that the maximum scouring depth increases when the falling height of the overflow increases up to a given height. However, the maximum scouring depth decreases if the falling height is greater than the critical height because the diameter of the vortex decreases at such falling heights. The relation between the diameter of the vortex and the maximum scour depth is compared to the formula used in two previous studies. The scour depth determined in this paper is smaller than that estimated by the previously published formula. Thus, it is important to evaluate the velocity on the bottom for accurate estimation of the maximum scour depth.

    DOI: 10.2208/kaigan.72.i_1087

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  • CONSIDARATION OF SEAWALL EFFECT ON TSUNAMI EVACUATION

    ARIKAWA Taro, NOJI Toru, HIRANO Hiroaki, ENDO Masato

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_1561 - I_1566   2016

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    The purpose of this study is to verify the effect of the seawall height on successful evacuation rates. The relation between the height of seawalls and the mortality was analyzed using the data of past questionnaires. Furthermore, numerical tsunami and evacuation simulations were performed for two towns to verify the effect of different seawall heights on morality. Under Tohoku tsunami conditions, the results indicate that early evacuation is more effective in decreasing mortality rates than constructing higher seawalls. The numerical results show that the inundation area decreases by 5% and the mortality decreases by 10 to 20% when the seawall height increased. On the other hand, the mortality rate was reduced to zero when the start time to evacuation is within 10 min.

    DOI: 10.2208/kaigan.72.i_1561

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  • INCOMPRESSIBLE SPH METHOD FOR CONSIDERATION OF PHENOMENON OF THE TOE SCOUR OF A SEAWALL

    MITOURIDA Naoto, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_595 - I_600   2016

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    The coastal structure may collapse due to beach erosion and scour. There are few cases that tried to analize the scour of coastal sturucture affected by tsunami. In numerical simulation, a particle method is suitable for tracking complicated surface water motion and sand movement. In this study, we performed the reproducible analysis of the toe scour of a seawall of the large-scale experiment using numerical simulation based on an accurate ISPH method. As a result, it is proved that the waveform and velocity of the first wave are accurate by reproduced. The behavior of scour can also be reproduced by the ISPH method.

    DOI: 10.2208/kaigan.72.i_595

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  • DEVELOPMENT OF TSUNAMI INUNDATION EVALUATION METHOD WITH DIFFERENT DAMAGE LEVEL OF SEAWALL

    SEKI Katsumi, ARIKAWA Taro, TOMITA Takashi, CHIDA Yu

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_301 - I_306   2016

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    The purpose of this study is to clarify the effect of different protective facility damage levels on tsunami inundation. The facility damage level due to the combination of earthquakes and tsunamis is unknown, so the numerical inundation evaluation methodology is verified using the Monte Carlo method, which is used to determine the seawall damage level. In this study, 942 cases with different seawall damage levels were performed. The results indicate that some areas exist where the maximum inundation height increases by around 30% and the beginning of inundation occurs about 2 min earlier than in the case with no seawall. On the other hand, the inundation area was almost covered in the case with no seawall.

    DOI: 10.2208/kaigan.72.i_301

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  • STUDY OF THE EFFECT OF THE TSUNAMI EVACUATION TOWER USING THE TSUNAMI EVACUATION SIMULATION

    KOYANAGI Yuki, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_1567 - I_1572   2016

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    This study attempts to investigate effect of a tsunami evacuation tower by using evacuation simulator is coupled with tsunami simulator. This simulator calculates the behavior of evacuation and tsunami at the same time. Thus, the difference of the human suffering and the impact on the evacuation behavior were validated. As a result, in this study's conditions, when the evacuation tower was established at the location near coastal area, it was confirmed possibility to encounter tsunami rises depending on the evacuation start time. On the other hand, when evacuation starts earlier than tsunami arrival time, it was confirmed that it is possible to significantly reduce the death rate. Finally, the effect of new tsunami evacuation tower was validated. As a result, it was confirmed that the death rate is decreased by shortening the average evacuation distance.

    DOI: 10.2208/kaigan.72.i_1567

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  • 杭係留方式浮体の津波による被災メカニズムの検討—Failure Mechanism of Mooring Pile System Pontoon by Tsunami

    有川 太郎, 中野 訓雄, 城戸崎 新

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1299 )   2 - 25   2015.3

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  • 鋼管杭による防波堤補強工法の津波越流時の安定性に関する研究—Stability of the Breakwater with Steel Pipe Piles under Tsunami Overflow

    有川 太郎, 及川 森, 森安 俊介

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1298 )   3 - 44   2015.3

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  • Damage to Ports and their Surrounding Areas in the Philippines due to Storm Surge and Waves of 2013 Typhoon Haiyan

    KAWAI HIROYASU, ARIKAWA TARO, ASAI TADASHI, HONDA KAZUHIKO, FUJIKI TAKASHI, SEKI KATSUMI

    港湾空港技術研究所資料   ( 1301 )   50P - 2,1-45   2015.3

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  • FUNDAMENTAL STUDY FOR SOIL SCOURING WITH A SLIDING SECESSION PROCESS BY USING A STABILIZED ISPH METHOD

    NOGAMI Tomotaka, ASAI Mitsuteru, ARIKAWA Taro, ABDELRAHEEM Aly Mahound

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   71 ( 2 )   I_389 - I_398   2015

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    In 2011, Tohoku-Kanto earthquake tsunami caused serious damage on the port structures such as breakwater and seawall. Damage mechanisms of these structures have been studied in the past, and there are mainly three causes; I. horizontal force due to the water level difference between the front and rear breakwater, II. piping destruction associated with the decline of the bearing capacity by seepage flow and III. soil scour and erosion behind the seawall during overflow. Fluid-Structure-Soil coupling simulation is desired for a systematic comprehension of seawall collapse mechanism, and it may help to develop next disaster prevention method. In this study, a particle simulation tool based on the SPH has been developed to solve soil scour problem. By using the empirical equation based on the correlation between shear velocity and sediment discharge, we implemented the numerical analysis to replicate phenomenon of scouring in the back of breakwater. The experiment tests with 1/25 scale breakwater are utilized for the validation of our numerical simulation model, then we have discussed the applicability and limitation of the empirical equation.

    DOI: 10.2208/jscejam.71.i_389

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  • CONSIDERATION OF CHARACTERISTICS OF PRESSURE ON SEAWALL BY SOLITARY WAVES BASED ON HYDRAULIC EXPERIMENTS

    ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   71 ( 2 )   I_889 - I_894   2015

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    This paper presents the experimental studies on the tsunami wave force by using solitary waves. The physical experiments were conducted by using different constant slopes, which are 1/40, 1/20, 1/10 and 0. The results indicated that the pressure coefficient of sustained wave pressure due to solitary waves was described as the square of Froude number and the energy loss of coefficient was obtained as 3.0. The impulsive bore force was 2 to 3 times as the sustained force, even if the condition of occurrence was limited.

    DOI: 10.2208/kaigan.71.i_889

    DOI: 10.20965/jdr.2021.p1286_references_DOI_MEKSYkNlfaLjFDXiyo7kSb9Jaua

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  • FUNDAMENTAL STUDY ON APPLICABILITY OF ISOLATION STRUCTURE AGAINST EARTHQUAKE MOTION AND TSUNAMI BY UTILIZING ASPHALTIC VISCOUS FLUID

    TAKEWUCHI Mikio, ARIGA Yoshiaki, WATANABE Takashi, KAWAGUCHI Shohei, NISHIMOTO Yasushi, HORI Muneo, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   71 ( 4 )   I_235 - I_245   2015

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    Wastewater treatment plants are usually constructed at coastal zone and river mouth area because of gravity system for collecting sewage. Consequently, they can be attacked by not only strong motion but also tsunami at earthquake time. In this study, we proposed isolation structural method against strong earthquake motion and tsunami by utilizing asphaltic viscous fluid isolator. Applicability of the method was examined by numerical analyses based on incompressible smoothed particle hydrodynamics. As a result, it is considered that wave pressure induced by tsunami can be reduced due to three-dimensional cushion effect of isolator.

    DOI: 10.2208/jscejseee.71.i_235

    DOI: 10.2208/jscejseee.73.i_721_references_DOI_LPv7DEIgq82kvYARkNXWl3teQg8

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  • Study of Stable Structure of the Breakwater for Tsunami with Steel Pipe Piles

    TANAKA Ryuta, MORIYASU Shunsuke, OIKAWA Shin, OKADA Katsuhiro, ARIKAWA Taro, MIZUTANI Takaaki, KIKUCHI Yoshiaki, YAHIRO Akihiko, SHIMOSAKO Kenichiro

    Journal of Fisheries Engineering   52 ( 2 )   119 - 122   2015

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    The structure of a "tenacious" breakwater is required from the Great East Japan Earthquake in 2011. The widening work is one of existing reinforcement methods of tenacious breakwaters. However, it also has large cross section in port inside area. Furthermore, scouring due to the overflow decreases the bearing capacity of the rubble mound and it makes the breakwater easy to fall down. In "Tsunami-Resistant Design Guideline for breakwaters", by Ministry of Land, Infrastructure and Transport, the widening work is described, on the other hand, the reinforcing method to resist tsunami with steel pipe piles is proposed too. Therefore, we developed the reinforced method of a tenacious breakwater with steel pipe piles. The breakwater has filling stones between the caisson and the steel pipe piles, and it can resist a tsunami tenaciously. We call the method "Steel Pipe method".

    DOI: 10.18903/fisheng.52.2_119

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  • 津波シミュレーションの現状と課題: ダイ43カイ カシカ ジョウホウ シンポジウム コウエン ロンブンシュウ ; ワークショップセッション チキュウ カンキョウ ・ サイガイ ノ カシカ Ⅰ

    アリカワ タロウ

    35 ( Suppl.1 )   251 - 256   2015

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  • STABILITY OF THE BREAKWATER WITH STEEL PIPE PILES UNDER TSUNAMI OVERFLOW

    ARIKAWA Taro, OIKAWA Shin, MORIYASU Shunsuke, OKADA Katsuhiro, MIZUTANI Takaaki, KIKUCHI Yoshiaki, YAHIRO Akihiko, SHIMOSAKO Kenichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   71 ( 2 )   I_623 - I_628   2015

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    In “The 2011 off the Pacific coast of Tohoku Earthquake”, many breakwaters in the coastal areas suffered extensive damage under tsunami overflow. It has been needed to develop the methods of reinforcing the breakwater, tenaciously.<br> The widening work is one of existing reinforcement methods of tenacious breakwaters. But, it also has large cross section in port inside area. Furthermore, Scouring due to the overflow decreases the bearing capacity of the rubble mound and it makes the breakwater easy to fall down. On the other hand, one of the reinforcing methods to resist tsunami, installing a steel wall behind the breakwater, was proposed by Oikawa, et al. (2014). In the series of loading tests, the model caisson on the dry sandy ground wad loaded horizontally. Applying the combination of steel wall and filling between the wall and the caisson improved the horizontal resistance of the caisson effectively. And, this improving method changes the failure mode of the caisson from sliding into ground bearing failure even in scouring cross section.<br> This paper deals with the stability of the breakwater with Steel Pipe Piles by the hydraulic model tests and the analyses. A breakwater cross section (‘O’ port) were used in the tests to clarify the failure mechanism of breakwater with the combination of the wall (composed of steel pipe piles) and the filling, called “Steel Pipe Method” here, under tsunami overflow. The summary is as follows.<br> 1. The experimental results show that “Steel Pipe Method” improves stability of breakwater under tsunami overflow.<br> 2. The main failure modes of the breakwater with “Steel Pipe Method” under tsunami overflow are ‘overturning of steel pipes’.

    DOI: 10.2208/jscejoe.71.i_623

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  • 296 CLARIFICATION FOR SOIL SCOURING WITH A SLIDING SECESSION PROCESS BY USING A STABILIZED ISPH METHOD

    Nogami Tomotaka, Asai Mitsuteru, Arikawa Taro, Abdelraheem Aly

    The Proceedings of The Computational Mechanics Conference   2015.28   _296-1_ - _296-2_   2015

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    DOI: 10.1299/jsmecmd.2015.28._296-1_

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  • STUDY OF EVACUATION BEHAVIOR CHARACTERISTIC USING EVACUATION SIMULATOR COUPLED WITH NUMERICAL WAVE FLUME

    ARIKAWA Taro, OIE Takayuki

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   71 ( 2 )   I_319 - I_324   2015

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    After The 2011 off the Pacific coast of Tohoku Earthquake, it has become important that not only enhancement of hardware side e.g. construction of seawalls, but devising the comprehensive effective disaster prevention schemes including software measures like establishment of evacuation scheme, according to increase of possible tsunami height. In this study, we develop the evacuation simulator coupled with numerical wave flume e.g. STOC or CADMAS-SURF/3D and looked into the impact of the street pattern and number of evacuation point against evacuation behavior at Kamaishi city and Iquique city, whose street patterns are characteristic, by using this simulator.

    DOI: 10.2208/kaigan.71.i_319

    DOI: 10.2208/kaigan.77.2_i_241_references_DOI_WzYEY4KXYAFeT57Bd1eDERGxeNK

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  • FAILURE MECHANISM AND LOAD TRANSFER OF THE BREAKWATER WITH STEEL PIPE PILES UNDER TSUNAMI OVERFLOW

    ARIKAWA Taro, OIKAWA Shin, MORIYASU Shunsuke, OKADA Katsuhiro, TANAKA Ryuta, HARATA Noriyoshi, MIZUTANI Takaaki, KIKUCHI Yoshiaki, YAHIRO Akihiko, SHIMOSAKO Kenichiro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   71 ( 2 )   I_1093 - I_1098   2015

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    In “The 2011 off the Pacific coast of Tohoku Earthquake”, many breakwaters in the coastal areas suffered extensive damage under tsunami overflow. It has been needed to develop the methods of reinforcing the breakwater, tenaciously.<br> One of the reinforcing methods to resist tsunami, installing a steel wall behind the breakwater, was proposed by Oikawa, et al. (2014), called “Steel Pipe Method” here. In the series of loading tests, the model caisson on the dry sandy ground wad loaded horizontally. Applying the combination of steel wall and filling between the wall and the caisson improved the horizontal resistance of the caisson effectively. And, this improving method changes the failure mode of the caisson from sliding into ground bearing failure even in scouring cross section. And the hydraulic model tests and the analyses was conducted by Arikawa, et al (2015). The experimental results show that “Steel Pipe Method” improves stability of breakwater under tsunami overflow.This paper deals with the stability of the breakwater installing “Steel Pipe Method”, which can be examined from quantitative dynamic equilibrium.

    DOI: 10.2208/kaigan.71.i_1093

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  • THE INFLUENCE OF THE FROUDE NUMBER ON THE STABILITY AGAINST TSUNAMI OF BRIDGE GIRDER

    WATANABE Masahiro, ARIKAWA Taro, TANAKA Yasushi, MARUYAMA Kyuichi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   71 ( 2 )   I_955 - I_960   2015

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    In this study, firstly, we clarified force to act on a bridge girder under steady flow by physical experiments. Next, we calculated velocity to act on the bridge girder by tsunami run up analysis using STOC, and predicted the damage of bridge girder. From the result of the physical experiment, we suggested a formula for computation of a drag coefficient and the lift coefficient under conditions of the steady flow. We performed tsunami run up analysis for bridges of the tsunami inundation area to get velocity to act on bridge girder and water level elevation.We performed the damage prediction of the bridge by empirical formula of a drag coefficient and the lift coefficient and velocity by tsunami going up analysis. As a result, the predictive precision improved more as a result of past by using this technique.

    DOI: 10.2208/kaigan.71.i_955

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  • NUMERICAL SIMULATION OF SCOURING BEHIND THE SEAWALL CAUSED BY TSUNAMI OVERFLOW WITH ACCURATE ISPH METHOD

    OIE Takayuki, WANG Dong, TAKATANI Takeshi, ARAKI Kazuhiro, LI Shaowu, GOTO Hitoshi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   71 ( 2 )   I_253 - I_258   2015

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    At The 2011 off the Pacific coast of Tohoku Earthquake, many seawalls were damaged by Tsunami overflow. Some previous studies indicated that if the foundation of structures was scoured, the stability of structures seriously declined, but the relationship between scouring depth and overflow hasn't been well understood and prediction method hasn't also established. In this study, the scouring depth caused by tsunami overflow was calculated by using numerical simulation based on accurate ISPH method and the results were compared with the physical model tests. The results of this study are as follows; 1) There is a high proportional relationship between scouring depth and the overflow depth, 2) The scouring behind the seawall can be reproduced and the maximum scouring depth can be evaluated by accurate ISPH method.

    DOI: 10.2208/kaigan.71.i_253

    DOI: 10.2208/kaigan.72.i_1087_references_DOI_TEhce3NsjMz6XIlakKxuBnbvH4s

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  • 高精度ISPH法による直立壁面上の砕波の数値解析 Reviewed

    後藤 仁志, 有川 太郎, ほか

    土木学会論文集B2(海岸工学)   70 ( 2 )   21 - 25   2014.11

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    A numerical wave flume based on a particle method is a key tool for a design of coastal structure under the action of extremely large and strongly nonlinear wave forces. The SPH, which is the predominant method in the international research society, contains unphysical artificial viscosity due to its explicit algorithm. The ISPH method evades the artificial viscosity by introducing semi-implicit algorithm, however it suffers from another drawback, namely a pressure fluctuation. In this study, accurate schemes, which have been developed to enhance a stability of pressure in the MPS method, are applied to the ISPH method, with examining their applicability through some benchmark tests.

    DOI: 10.2208/kaigan.70.I_21

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  • 杭係留方式浮桟橋の津波外力推定に関する考察 Reviewed

    有川 太郎, 中野 訓雄, 城戸崎 新, 三上 隆, 西 和宏

    土木学会論文集B2(海岸工学)   70 ( 2 )   906 - 910   2014.11

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    In this paper, responses of a pontoon in tsunami were studied. As an example, a pontoon by the mooring pile system of Izushima fishing port in Miyagi Pref. was treated. The pile of the pontoon was pulled out of the tsunami which was derived from the Great East Japan Earthquake. Model tests in a solitary wave was carried out and tsunami simulation was also carried out. The pontoon was capsized in fast elevating cases of water surface. In order to suppress the capsizing, it is effective to place the roller fender lower than the gravity center to increase restoring moment. According to the tsunami simulation for Izushima fishing port, tsunami height was small enough compared to the wave length and elevation speed was slow. Thus, the pullout force of the pile is estimated mainly from surplus buoyancy, and capsizing should not be occurred.

    DOI: 10.2208/kaigan.70.I_906

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  • 越流による直立型堤防背後の洗掘量に関する研究 Reviewed

    有川 太郎, 池田 剛, 窪田 幸一郎

    土木学会論文集B2(海岸工学)   70 ( 2 )   926 - 930   2014.11

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    Many breakwaters were damaged by the Great East Japan Earthquake of March 11, 2011. Many of these were destroyed under tsunami overflow. Some results of researches indicated that in the case where scouring of the foundation had occurred, the safety factors for bearing capacity failure declined to less than in a case where the foundation part was not scoured. But, the relation between the overflow and scouring depth had not been clarified. In this study, the scouring depth due to tsunami overflow was investigated by using the physical model tests. Results pointed out that the scouring depth can be evaluated by the scale of vortex due to overflow.

    DOI: 10.2208/kaigan.70.I_926

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  • もたれ式護岸における被覆ブロック及び根固工の効果 Reviewed

    平野 誠治, 有川 太郎

    土木学会論文集B2(海岸工学)   70 ( 2 )   936 - 940   2014.11

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    Leaning revetment is a common type of seawall structure. In common cases, armor blocks and foot protections are placed in front of their lower part. Main purpose of the blocks is to prevent rubble foundation sucking away in high wave condition. However, previous study indicates that these blocks prevent sudden displacement of leaning revetments. In this study, experiments were conducted to measure effect of the blocks to prevent leaning revetments' displacement. The result of the experiments indicated that these blocks have functions: they help to increase stability of leaning revetment's structure including rubble backing if the blocks have abundant weights, they could be evaluated in calculation of stability of leaning revetments, offshore direction force which they receive by a leaning revetment may change under their placed condition.

    DOI: 10.2208/kaigan.70.I_936

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  • 防波堤の腹付け被覆ブロックの安定性 Reviewed

    有川 太郎, 岡田 克寛, 下迫 健一郎

    土木学会論文集B2(海岸工学)   70 ( 2 )   941 - 945   2014.11

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    One of the possible basic structural countermeasures taken for a breakwater to protect foundation mound and seabed against scouring caused by overflow is widening work for increasing the height of the foundation mound behind the breakwater. The widening work behind the caissons is topped with scour prevention work and a revetment to provide scour resistance to the structure. But the stability of armour blocks on the widening works is not cleared. In this report, the physical experiments were conducted to make clear the mechanism of failure of armour blocks under overflow of tsunami, and to consider the estimation methodology of stability of armour blocks. The results indicated that the stability of blocks related with the porosity of blocks and was estimated by using Isbash equations.

    DOI: 10.2208/kaigan.70.I_941

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  • 数値波動水槽とDEMの連成モデルを用いたコンテナ漂流挙動に関する検討 Reviewed

    池田 剛, 有川 太郎

    土木学会論文集B2(海岸工学)   70 ( 2 )   331 - 335   2014.11

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    In ports damaged by Tsunami after The 2011 off the Pacific coast of Tohoku Earthquake, secondary damages were occurred by collision of drifting objects such as container. To reduce those secondary damages, it is important to predict the drifting-motion. In this research examining mechanisms of drifting container, at first, physical experiment was conducted using solitary wave. Then, numerical experiment was conducted under the same conditions using "Solid-Gas-Liquid Coupled CADMAS-SURF/3D". At last, the model applicability was evaluated. In conclusion, the results showed that, in the experimental conditions of this study, this model can be applied to the simulation of container drift.

    DOI: 10.2208/kaigan.70.I_331

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  • CADMAS-SURF/3Dを用いた防潮堤背後の建屋に作用する津波力の検討 Reviewed

    大家 隆行, 有川 太郎

    土木学会論文集B2(海岸工学)   70 ( 2 )   801 - 805   2014.11

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    After 2011 Tohoku-Oki Earthquake, construction of seawalls with tenacious structure is needed, but there are few studies about change of tsunami force acting on buildings behind the seawalls according to construction of them. So in this study, we looked into the applicability of CADMAS-SURF/3D to calculate tsunami force through reproduction calculation of physical model experiment which was conducted by Arikawa and Oie (2014), and consider about change of tsunami force according to seawalls condition. The results of this study are as follows; 1) The tsunami force acting on buildings behind the seawalls is well reproduced with CADMAS-SURF/3D, 2) Depending on the distance from seawalls, some cases with seawalls have bigger coefficient of pressure α than the cases with no seawalls.

    DOI: 10.2208/kaigan.70.I_801

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  • 防潮堤背後の建物に作用する津波力に関する実験的検討 Reviewed

    有川 太郎, 大家 隆行

    土木学会論文集B2(海岸工学)   70 ( 2 )   806 - 810   2014.11

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    In this report, the effectiveness of decreasing of tsunami force due to seawall was investigated by physical experiments. The seawall with 30cm height was used in this study, and solitary waves and sin waves were attacking on the building behind the seawall. Three different situations of seawall were tested. One is without seawalls, the other is with seawalls, and those seawalls are falling or rigid. The results show that the relationship between the Froude number and the coefficient of pressure are based on the Bernoulli's principle. When the tsunami height is almost same as the height of seawall, the pressure on the buildings behind seawalls are getting smaller than that without seawalls. The speed of falling of seawall is affected on the pressure on the building. If the speed is getting higher, then the pressure is getting larger.

    DOI: 10.2208/kaigan.70.I_806

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  • 数値波動水槽を用いた津波越流時における防波堤の安定性の検討 Reviewed

    有川太郎, 林 達也, 鈴木崇之, 下迫健一郎

    土木学会論文集B3(海洋開発)   70 ( 2 )   366 - 371   2014.10

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    After 2011's tsunami , there are a few physical experiments on the stability verification of breakwaters under overflow. These results indicated that the unstability of caisson increases as the difference of water level between front side and rear side increases. The estimation formula for the lateral force under the overflow was also submitted under the limitation number of experiments. The applicability of this equation is not clear. So, in this paper, the applicability of empirical formula is verified by using the numerical simulations. The results indicated that the empirical formula could estimate the stability as the safety side. Through the numerical tests with various shape of the cassions, the device such as parapet or something make the lateral force decreasing because of increasing the vertical force at the crown or increasing the supporting force at the rear side. The economical shape of caissons can be designed against the overflow.

    DOI: 10.2208/jscejoe.70.i_366

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  • 階層型シミュレーションによる高精細津波遡上計算手法の開発—Development of High Resolution Tsunami Runup Calculation Method Based on a Multi Scale Simulation

    有川 太郎, 富田 孝史

    港湾空港技術研究所報告 = Report of the Port and Airport Research Institute / 港湾空港技術研究所 編   53 ( 2 )   3 - 18   2014.6

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  • On Enhancement of Incompressible SPH Method for Simulation of Violent Sloshing Flows Reviewed

    H. Gotoh, A. Khayyer, H. Ikari, T. Arikawa, K. Shimosako

    Applied Ocean Research   46   104 - 115   2014.6

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  • Adiabatic流体におけるCFDイノベーションの可能性—Instructions for Preparation of Manuscripts for The Proceedings of Computational Engineering Conference of JSCES

    奥村 弘, 有川 太郎, 内山 一郎

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   19   3p   2014.6

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  • Initial Report of JSCE-PICE Joint Survey on the Storm surge disaster caused by Typhoon HAIYAN Reviewed

    Y. Tajima e

    Coastal Engineering Journal   56 ( 01 )   1450006 - 1-12   2014.3

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    DOI: 10.1142/s0578563414500065

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  • Study on Assessment of Wave Forces Exerted on Bridges by Tsunami

    Tanaka Y., Maruyama K., Arikawa T.

    Concrete Journal   52 ( 12 )   1059 - 1066   2014

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    This paper gives an overview of the damage to bridges caused by the 2011 Tohoku Earthquake Tsunami Disaster and its characteristics, and then goes on to verify the extent to which the existing bridge stability evaluation formula is applicable, based on the damage data for the bridges in the tsunami inundation areas.

    DOI: 10.3151/coj.52.1059

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    Other Link: http://id.ndl.go.jp/bib/025953498

  • Large Hydro-Geo Flume at Port and Airport Research Institute - Recent Research and Social Responsibility

    Arikawa Taro, Shimosako Kenichiro

    Marine Engineering   49 ( 3 )   350 - 355   2014

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    DOI: 10.5988/jime.49.350

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    Other Link: http://id.ndl.go.jp/bib/025518232

  • A STUDY OF GPU-MPI HYBRID PARALLEL COMPUTATION OF CADMAS-SURF/3D

    OKUMURA Hiroshi, ARIKAWA Taro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   70 ( 2 )   I_361 - I_365   2014

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    We ported CADMAS-SURF/3D program into a CUDA-MPI hybrid parallel application to achieve further enhancement in execution speed, and studied it's characteristics. By eliminating the data rearrangement overhead remained in the previous paper, we achieved 800% relative speed in single process execution. By utilizing CUDA runtime enabled MPI library, we found that the porting was quite simplistic and straight forward. Even though we verified all variable contents at runtime to justify the algorithm equality between CUDA and FORTRAN, we encountered instability in computation results. But some cases indicated that further speed enhancement was quite possible with hybrid parallelism.

    DOI: 10.2208/jscejoe.70.i_361

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  • Field Survey on Typhoon 1330 Wind, Wave, Storm Surge Effects on Philippine Ports

    KAWAI HIROYASU, ARIKAWA TARO, HONDA KAZUHIKO, ASAI TADASHI, FUJIKI TAKASHI, KUWAJIMA RYUICHI

    土木学会論文集 B2(海岸工学)(Web)   70 ( 2 )   I.1436-I.1440 (J-STAGE) - I_1440   2014

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    The effects of the wind, the storm surge, and the waves of Typhoon 1330 (Haiyan or Yolanda) were surveyed at Tacloban Port and Airport on Leyte Island and at several ports on Panay Island, Philippines. The windows and roofs of the port office buildings were broken owing to intense wind at the majority of the ports. The ground floor was flooded by only the storm surge or by the storm surge and the waves, at Tacloban, Estancia, Caticlan, and Lipata Ports. The wave-induced damage of the wharf was severe at Estancia and Lipata Ports. The containers and the mooring ships were drifted at Tacloban, Estancia, and Culasi Ports by the wind, the storm surge, or the waves. The information obtained through hearing investigation is useful for the calibration of numerical hindcasts.

    DOI: 10.2208/kaigan.70.I_1436

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  • もたれ式護岸の被災形態に関する研究 Reviewed

    平野誠治, 有川太郎

    土木学会論文集B2(海岸工学)   69 ( 2 )   931 - 935   2013.11

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    Seawalls play a very important role in protecting Japan's coastline, but they may sometimes be destroyed by high waves. The leaning revetment is a common type of seawall structure. The modes of destruction of the leaning revetments were classified into two types: sliding of the bottom of the revetment bodies in the offshore direction, and joint fracture. However, factors which choose each destruction mode were unknown. In this study, experiments were conducted to inspect destruction processes of leaning revetments and its factors in putting emphasis on behaviors of revetments' bodies. The results of the experiments indicated that blocks in front of revetments might restrain sharp sliding of revetments' bodies, and a joint fracture might occur if an impulsive wave force acted on a revetment in particular conditions.

    DOI: 10.2208/kaigan.69.i_931

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  • 津波バリアを用いたコンテナ漂流物捕捉効果に関する実験的研究 Reviewed

    宇野勝哉, 有川太郎

    土木学会論文集B2(海岸工学)   69 ( 2 )   921 - 925   2013.11

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    The measure of floating objects is regarded as important to reduce the second damage caused by tsunami, but there is little knowledge about measures. In this research, the capture effect of containers is examined by hydraulic model experiments using the tsunami barrier. As a result, when pile pitch is smaller than the width of the container, the outflow rate depends on height of the pile and inundation. In addition, the outflow rate extremely tends to rise when the depth of the inundation more than a half of the height of the tsunami barrier. Thus, it is necessary to secure the height of pile of the degree to double of the inundation height in order to get a high capture effect.

    DOI: 10.2208/kaigan.69.i_921

    DOI: 10.2208/jscejoe.71.i_713_references_DOI_QJBN4TgeLL9xdRaXX09IFrQTCfp

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  • 港内に設置された浮体構造物の津波による被災メカニズムの研究 Reviewed

    有川太郎, 中野訓雄, 城戸崎新, 三上 隆, 西 和宏

    土木学会論文集B2(海岸工学)   69 ( 2 )   866 - 870   2013.11

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    In this study, we investigated damaged situation of floating structures in Miyagi Pref. caused by tsunamis in the Great East Japan Earthquake and it made clear that some structures mooring with pile were flowed away. However, structures mooring with chains were never flowed away. we used a case of Izushima, Onagawa-town to examine a mechanism suffered floating structures that mooring with piles and chains. In the case of pile mooring, from the result of examination, it was estimated that piles were left out by tsunami water level rising. In the case of chain mooring, at the result of numerical calculation using by STOC and mooring simulation, it was found that dredging anchor blocks became important factor against outflow.

    DOI: 10.2208/kaigan.69.i_866

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  • 津波による橋梁の安定性に関する検討 Reviewed

    有川太郎, 渡邉政博, 窪田幸一郎

    土木学会論文集B2 (海岸工学)   69 ( 2 )   911 - 925   2013.11

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    This study is an investigation of the mechanism of the washout of bridge girders by tsunamis, performed by conducting 1/10 scale model experiments and numerical calculation for the case of the Numata Overpass. First, the flow experiment conducted. It confirmed that the flow velocity below the bridge girder is higher than the flow velocity above the bridge girder, applying downward force on the bridge girder. Therefore, the result was that the bridge girder was stabilized by increasing resistance to the flow. Next, the solitary wave experiment confirmed that a lift force caused by fluctuation of the water surface washed out the bridge girder. Finally, CADMAS-SURF 3D replicated the experiments numerically and confirmed the validity of the calculations.

    DOI: 10.2208/kaigan.69.i_911

    DOI: 10.2208/journalofjsce.7.1_43_references_DOI_HikF04Z8Gm58tmi9dSJzFUF3nC4

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  • ケーソン防波堤の津波越流時における目地の影響評価に関する数値解析 Reviewed

    後藤仁志, 五十里洋行, 有川太郎, ほか

    土木学会論文集B2(海岸工学)   69 ( 2 )   886 - 890   2013.11

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    In the initial report on a tsunami disaster in the Great East Japan Earthquake, a scouring at a joint between caissons was listed up as one of the causes of failure of a composite breakwater. Although posterior experiments proved that it was not crucial mechanism, a flow field behind a caisson was not investigated in detail in those experiments. In this study, to clarify a complicated flow field driven by jet from a joint and tsunami overflow, we carry out a numerical simulation by using a numerical wave flume based on an accurate particle method. Especially, we focus on a three-dimensional flow structure around a joint between caissons.

    DOI: 10.2208/kaigan.69.i_886

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  • 津波越流時における防波堤の安定性に関する研究 Reviewed

    有川太郎, 佐藤昌治, 下迫健一郎, 厳 駿

    土木学会論文集B2(海岸工学)   69 ( 2 )   916 - 920   2013.11

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    A large number of breakwaters were damaged by the Great East Japan Earthquake on March 11, 2011. Many were destroyed by tsunami overflows. In this research, physical experiments were conducted using various breakwater cross-sections to clarify the exact failure mechanisms caused by tsunami overflows. Using the experimental results, the cause for the breakwaters' collapse can be verified using the safety factor of sliding, overturning and bearing capacity of each breakwater. If the overflows scoured the rubble mound, the safety margin was estimated using a post-scouring cross-section. Scouring by overflows decreases the rubble mound's bearing capacity, increasing the likelihood that breakwater would collapse. When the scouring reaches the bottom of the caisson, it generates a hole that the caisson gradually falls into.

    DOI: 10.2208/kaigan.69.i_916

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  • 振動水柱型空気タービン方式波力発電装置付きケーソンの発電効率に関する検討 Reviewed

    有川太郎, ほか

    土木学会論文集B2(海岸工学)   69 ( 2 )   1306 - 1310   2013.11

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    In this research, the hydraulic model experiment examined the power generation efficiency of the caisson furnished with PW-OWC type wave power generation equipment. OWC type wave power generation equipment has established the air chamber in which the portion submerged in water carried out the opening in the front of caisson. The problem is that the primary conversion efficiency of energy will decrease rapidly if the period of a wave separates from a resonance period. Therefore the wall called a projecting wall in the normal line right-angled direction was installed in the front of an air chamber. The primary conversion efficiency of energy of OWC breakwater with PW is larger about 10%. that without breakwater.

    DOI: 10.2208/kaigan.69.i_1306

    DOI: 10.2208/jscejoe.72.i_802_references_DOI_3xEqU9r3oN8J19IteCSZeSl2zWW

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  • 越流した津波の引波時における岸壁の安定性に関する研究 Reviewed

    有川太郎, 佐藤昌治

    土木学会論文集B2(海岸工学)   69 ( 2 )   971 - 975   2013.11

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    In this research, the stability of the quay is examined by hydraulic model experiments at the time of the back rush of overflow tsunami. As a result, by taking earth pressure in back into consideration, it makes clear that the collapse phenomenon of a quay is a slide due to water level difference between front and rear side of a quay. The value of pressure of front side, which is in contact with the rubble ground, has dispersion. This dispersion has influenced stability of a quay and it is producing variation in failure of a quay. Moreover, in order to abolish the variation in the pressure, when it verified using the front water level, it turned out that stability is verifiable to a safe side. In the range of this experiment, it is possible to verify the stability of a quay by applying this assumption.

    DOI: 10.2208/kaigan.69.i_971

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  • 防波堤開口部の耐津波安定性についての実験ならびに数値計算—Research on Stability of Opening Section at Baymouth Breakwater

    作中 淳一郎, 有川 太郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1274 )   2 - 26   2013.9

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  • Failure mechanism of breakwaters due to tsunami; a consideration to the resiliency Reviewed

    T.Arikawa, K. Shimosako

    6th Civil Engineering Conference in the Asian Region   ( 301 )   2013.8

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  • 波力発電装置波浪実験に関する大規模模型の製作過程 Reviewed

    武田将英, 有川太郎, ほか

    土木学会論文集B3(海洋開発)   69 ( 2 )   103 - 108   2013.7

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    Generally, many models for large-scale hydraulic test are made from steel and concrete, because it is necessary for them to have strength and durability. Therefore, construction managements that contain safety, accuracy, workability and process control similar to site construction are needed. Although engineers should have knowledge for both general laboratory experiment and site works of construction, there have been no manuals for construction of large-scale model. This is a case study for the large-scale model construction process based on construction of 1/6. 67 scale model used for wave test of the wave power generation facility.

    DOI: 10.2208/jscejoe.69.I_103

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  • GPUによるCADMAS-SURF/3DのCUDA並列化と検討 Reviewed

    奥村 弘, 有川 太郎

    土木学会論文集B3(海洋開発)   69 ( 2 )   754 - 759   2013.7

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    We present a new faster GPU computation and algorithm for CADMAS-SURF/3D by a CUDA parallelization techinique on a GPU accelerator "Tesla". In this paper, we examine the CUDA porting tool for GPU computation and suggest a macro code by C preprocessor for CADMAS-SURF/3D originally coded in FORTRAN to be adopted into CUDA C language. Furthermore, we optimize the data access sequence pattern from a profiling result to eliminate the calculation bottleneck. We inspect the legitimacy of the solution by examining the rounding error, and then examine the program tuning by a data sequence access pattern optimization.

    DOI: 10.2208/jscejoe.69.I_754

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  • 世界初-直立浮上式防波堤の構造および性能検証の概要

    小林 真, 有川 太郎, 木原 一禎, 井上 博士, 笠原 宏紹

    JSSC : 日本鋼構造協会機関誌   2013 ( 13 )   6 - 7   2013.4

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  • Damage in Ports due to the 2011 off the Pacific Coast of|rn|Tohoku Earthquake Tsunami Reviewed

    Takashi Tomita, Taro Arikawa, Tadashi Asai

    Journal of Disaster Research   8 ( 3 )   594 - 604   2013.4

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  • 津波越流時における混成堤の被災メカニズムと腹付工の効果—Failure Mechanism and Resiliency of Breakwaters under Tsunami

    有川 太郎, 佐藤 昌治, 下迫 健一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1269 )   3 - 37   2013.3

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  • 津波による橋梁の安定性に関する検討—Stability of Bridge Girder under Tsunami

    有川 太郎, 渡邉 政博, 窪田 幸一郎

    土木学会論文集. B2, 海岸工学 = Journal of JSCE. Ser. B2, Coastal engineering / 土木学会海岸工学委員会 編   69 ( 2 )   911 - 915   2013

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  • もたれ式護岸の被災形態に関する研究

    平野 誠治, 有川 太郎

    国土交通省国土技術研究会論文集   75 - 80   2013

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  • Collapse Mechanisms of Seawall due to the March 2011 Japan Tsunami using the MPS method Reviewed

    T. Arikawa, N. Ishikawa, M. Beppu, H. Tatesawa

    International Journal of Protective Structures   3 ( 4 )   457 - 476   2012.12

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  • Structural Failure by Impulsive Tsunami Force Reviewed

    T. Arikawa, K. Shimosako, N. Ishikawa

    5th International Conference on Protection of Structures against Hazards   2012.11

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  • 東日本大震災における釜石湾口防波堤の被災メカニズムに関する研究 Reviewed

    有川太郎

    土木学会論文集B2(海岸工学)   68 ( 2 )   826 - 830   2012.11

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  • 衝撃砕波力によるもたれ式護岸の打継ぎ部の破壊に関する実験的研究 Reviewed

    有川太郎, 鷲崎誠

    土木学会論文集B2(海岸工学)   68 ( 2 )   796 - 800   2012.11

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  • Protection of Seawalls against Tsunami Reviewed

    N.Ishiakwa, T.Arikawa, M.Beppu, R.Inoue, H.Tatesawa

    5th International Conference on Protection of Structures against Hazards   2012.11

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  • Research on Stability of Opening Section at Bay-mouth Breakwater Reviewed

    J. Sakunaka, T.Arikawa

    33rd International Conference on Coastal Engineering   ( 432 )   2012.7

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  • Failure Mechanism of Kamaishi Breakwaters due to the Great East Japan Earthquake Tsunami Reviewed

    T. Arikawa

    33rd International Conference on Coastal Engineering   ( 1191 )   2012.7

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  • もたれ式護岸の打継ぎ部における衝撃砕波圧による破壊・変形に関する大規模実験—Large-Scale Experiment on the Destruction and Deformation of Joints of a Leaning Revetment Caused by Impact Wave Pressure

    鷲崎 誠, 有川 太郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1253 )   2 - 29   2012.6

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  • 釜石湾口防波堤の津波による被災メカニズムの検討 : 水理特性を中心とした第一報—Investigation of the Failure Mechanism of Kamaishi Breakwaters due to Tsunami : Initial Report Focusing on Hydraulic Characteristics

    有川 太郎, 佐藤 昌治, 下迫 健一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1251 )   3 - 52   2012.3

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  • 震災特集 土木学会東日本大震災特別委員会 報告

    97 ( 1 )   42 - 52   2012.1

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  • 緊急時に海底から浮上する直立浮上式防波堤の開発

    キハラ カズヨシ, マエカワ ツトム, アリカワ タロウ

    49 ( 4 )   61 - 70   2012

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  • ユニット型多重共振波力発電装置(高効率発電装置)の開発

    キハラ カズヨシ, オオサワ ヒロユキ, アリカワ タロウ

    49 ( 4 )   52 - 60   2012

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  • 釜石港口防波堤の津波による被災メ力ニズムの検討

    有川太郎

    港研資料   1251   52   2012

  • Tsunami Disaster due to the Great Eastern Japan Earthquake

    Concrete Journal   50 ( 1 )   23 - 29   2012

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    Language:Japanese   Publisher:Japan Concrete Institute  

    DOI: 10.3151/coj.50.23

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    Other Link: http://id.ndl.go.jp/bib/023416011

  • 東北太平洋沖地震による津波被害とメカニズム—Disasters of structures due to the 2011 off the Pacific coast of Tohoku Earthquake Tsunami—特集 東日本大震災 : 木材産業に何が起きたのか ; 東日本大震災を科学的に検証する

    有川 太郎

    木材工業 = Wood industry   66 ( 11 )   498 - 503   2011.11

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  • 2010年Mentawai地震津波の現地被害調査 Reviewed

    富田孝史, 有川太郎, ほか

    土木学会論文集B2(海岸工学)   67 ( 2 )   1281 - 1285   2011.11

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    A tsunami generated by an earthquake of Mw 7.7 hit North and South Pagai Islands and Sipola Island of Mentawai Islands lying off the west coast of Sumatra Island. This paper reports results of a joint field survey on the tsunami disasters. In the survey tsunami inundation and runup heights were measured in North and South Pagai Islands, and interview investigation was also conducted to understand people's evacuation action in the islands. Averaged tsunami height was about 6 m in the islands, resulting in many losses of human lives and houses. However, there was a good example of evacuation. A person who heard sound of tsunami approaching run to hill with transmitting information of the tsunami coming to other residents, and therefore all residents could evacuate to save their lives.

    DOI: 10.2208/kaigan.67.i_1281

    DOI: 10.2208/kaigan.67.i_301_references_DOI_1BaWWUD2uyTgTMNqnCveASOZVac

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  • 数値波動水槽を用いた湾口防波堤における潜堤の安定性の検討 Reviewed

    作中淳一郎, 有川太郎

    土木学会論文集B2(海岸工学)   67 ( 2 )   716 - 720   2011.11

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    The baymouth breakwater is to protect the port area from tsunamis as well as storm waves. A submerged dike is built at the central opening section of the tsunami breakwater to close the bay mouth as much as possible. Because of narrowness, strong current is expected at the occasion of design tsunami attack. The submerged dike consisting of a rubble mound foundation and a crown caisson must be stable against the strong current. The present paper points out stability of the crown submerged caisson on the basis of the result of experiment and numerical wave tank (CADMAS-SURF/3D), and according to these results, verifies the validity of pressure coefficients calculated from hydrodynamic forces.

    DOI: 10.2208/kaigan.67.i_716

    DOI: 10.2208/proce1989.50.716

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  • 流体構造連成計算システムを用いた護岸上部工打ち継ぎ部の破壊変形計算 Reviewed

    浜口一博, 有川太郎, 北川和士

    土木学会論文集B2(海岸工学)   67 ( 2 )   771 - 775   2011.11

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    Recently, CFD and FEM analysis are being applied to design and disaster measures of port and harbor structures, and various reports have been performed so far. However, there are not many techniques for simulating accurancy good to the iteraction between wavefields and deformation and fracture of structures. So, we improved the system in the past by Arikawa(2009), and developed as a new Fluid-Structure coupled system, CADMAS-SURF/3D--STR3D, which can treat the large scale model and large scale deformation. And we verified the validity of this developed system, comparing with the water tank test in the past.

    DOI: 10.2208/kaigan.67.i_771

    DOI: 10.20965/jdr.2019.p0225_references_DOI_LP5tu45f4NKkIl2PhcJUPbj9Xtx

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  • 数値波動水槽とDEMのカップリングによる固気液3相計算システムの開発 Reviewed

    有川太郎, 秋山実, 山崎昇

    土木学会論文集B2(海岸工学)   67 ( 2 )   21 - 25   2011.11

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    It is important to develop the Solid-Gas-Liquid coupling system for analyzing the mechanism of failure of structures on land by Tsunami. At first, the numeric wave tank, whose name is CADMAS-SURF/3D, is improved to correspond to two phase incompressible fluid. This two phase flow tank is applied to the impulsive wave pressure problem. As a result, it is confirmed that a numeric noise, which is called Spike Noise, is removed and the accuracy of the result is good agreement with the single phase model. Next step, the coupling system with DEM method is developed. The wall destruction test by fluid is conducted. The appearance of the wall destruction adjusted the large-scale experiment, and the validity of three phase coupling system is confirmed qualitatively.

    DOI: 10.2208/kaigan.67.i_21

    DOI: 10.20965/jdr.2019.p0225_references_DOI_FQPYAPXtUg18U53U41JbiHxT4uh

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  • 海岸保全施設の被災とそのメカニズムと対策について

    ( 15 )   49 - 52   2011.10

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  • Development of Vertically Telescopic Breakwater and Its Practical Application Reviewed

    T. Takayama, T. Arikawa, S. Nakashima, F. Kurokawa, K. Obara

    Coastal Structures 2011   1263 - 1275   2011.9

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  • 特集 東日本大震災における港湾施設等の津波被害

    高橋 重雄, 下迫 健一郎, 有川 太郎

    CDIT : 一般財団法人沿岸技術研究センター機関誌   ( 35 )   12 - 15   2011.6

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  • 2010年ムンタワイ地震津波に関する現地被害調査—Field survey on the 2010 Mentawai tsunami disaster

    富田 孝史, 有川 太郎, 熊谷 兼太郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1235 )   2 - 23   2011.6

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  • 捨石傾斜堤におけるエネルギー損失量に関する実験的研究—Experimental study on energy dissipation at rubble mound breakwater

    関 克己, 有川 太郎, 水谷 雅裕

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1229 )   2 - 15   2011.3

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  • 津波による漂流木のコンクリート壁面破壊に関する大規模実験 Reviewed

    有川太郎, 鷲崎誠

    土木学会論文集B2(海岸工学)   66 ( 1 )   781 - 785   2010.11

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    The present study aimed to clarify the influence of the driftwood collision to the destruction of the concrete slab due to tsunamis. The applicability of the empirical formula based on Hertz theory was examined by the large scale collision experiments on the concrete slab with timber in the air and driftwood due to tsunami. The duration time calculated by the formula was good agreement with that obtained from the experimental record of the strain gauge when colliding. It indicated that the impulsive force due to drift wood collision could be estimated by using this formula. Moreover, it was clarified that the destructive force on the concrete slab increased by the collision of driftwood compared with only tsunamis.

    DOI: 10.2208/kaigan.66.781

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  • 消波ブロック被覆堤の消波工被覆状態と波の不規則性の波圧の出現確率分布への影響 Reviewed

    関口克己, 有川太郎

    土木学会論文集B2(海岸工学)   66 ( 1 )   841 - 845   2010.11

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    Reliability design of maritime structures based on the deformation level will be one of the most important future design tools. However, it has not been fully applied to actual design since it is very difficult to take the various design condition into account. The present paper points out on the basis of the experimental results in random wave field, the influences of the state of wave-dissipating blocks on the wave pressures at several cross sections of a breakwater, and the stochastic characteristics of obtained data was examined. The random wave experiment data and the regular wave data correspond well when the impulsive wave pressure is not generated, however when the impulsive wave pressure is generated, the wave pressure on still water level of both experiments are greatly different.

    DOI: 10.2208/kaigan.66.841

    DOI: 10.2208/proce1989.54.841

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  • 数値波動水槽における抵抗力算定手法の波力への影響 Reviewed

    琴浦毅, 川崎浩司, 秋山実, 有川太郎

    土木学会論文集B2(海岸工学)   66 ( 1 )   776 - 780   2010.11

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    CADMAS-SURF/3D is a three-dimensional numerical wave tank under development which has recently been applied to some studies of wave-structure interaction. However some problems have been pointed out: for example it is difficult to determine the reasonable drag coefficient and grid dependency of resistance is remarkable. In this study we clarified grid dependency of resistance using a conventional resistance calculation method and examined the influence of drag coefficient on wave force. Next the applicability of the CADMAS-SURF/3D with a Dupuit-Forhhimer method was investigated through the comparison between experimental and numerical results of wave pressures acting on the superstructure of sloping breakwater.

    DOI: 10.2208/kaigan.66.776

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  • 3次元数値波動水槽CADMAS-SURF/3Dへの造波ソースの導入とその妥当性 Reviewed

    山野貴司, 有川太郎, 川崎浩司, 小竹康夫, 秋山実

    土木学会論文集B2(海岸工学)   66 ( 1 )   6 - 10   2010.11

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    The purpose of the present study is to newly propose a numerical wave tank by introducing a wave generation source into a CADMAS-SURF/3D and verify the validity of the numerical wave tank. The numerical experiments with the change of the coefficient α, which is related to the strength and extensity of wave generation source, revealed that the most appropriate waves are able to be generated in the case of α=2. The applicability of the proposed numerical wave tank was confirmed by applying it to oblique wave generation problems and comparing the numerical results with the results of the laboratory experiment on wave deformation under Tsunami action.

    DOI: 10.2208/kaigan.66.6

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  • 直立浮上式防波堤に関するシステム機器の開発 Reviewed

    木原一禎, 有川太郎, 小林真, 永友久信

    海洋開発論文集   26   243 - 248   2010.7

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  • 津波の力について

    有川 太郎

    地震ジャーナル / 地震予知総合研究振興会 [編]   ( 49 )   30 - 39   2010.6

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  • Large Tsunami Experiments Reviewed

    T. Arikawa, S. Takahashi, K. Shimosako, M.mizutani

    The 32nd PIANC Congress   ( 210 )   2010.5

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  • Development of Urgently Emerging Tsunami Breakwater- Buoyancy Driven Vertical Piling System Reviewed

    T. Takayama, T. Arikawa, D. Nishimura, M. Hirasawa

    The 32nd PIANC Congress   ( 305 )   2010.5

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  • 2009年サモア諸島津波の現地調査—Field survey on 2009 Samoa Islands tsunami

    有川 太郎, 辰巳 大介, 松崎 義孝

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1211 )   2 - 26   2010.3

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  • 2010年チリ地震津波のチリ沿岸での現地調査

    今村 文彦, 藤間 功司, 有川 太郎

    津波工学研究報告 = Tsunami engineering = research report of tsunami engineering / 東北大学災害科学国際研究所(津波工学研究分野) 編   ( 27 )   83 - 89   2010.3

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  • 2010年チリ地震津波の被害調査速報—Preliminary report of field survey on the 2010 tsunami in Chile

    今村 文彦, 藤間 功司, 有川 太郎

    自然災害科学 = Journal of Japan Society for Natural Disaster Science   29 ( 1 )   97 - 103   2010

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  • 消波ブロック被覆堤における消波工被覆状態の波圧に及ぼす影響 Reviewed

    関克己, 有川太郎, 水谷雅裕

    土木学会論文集B2(海岸工学)   65 ( 1 )   816 - 820   2009.11

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    Reliability design of maritime structures based on the deformation level will be one of the most important future design tools. However, it has not been fully applied to actual design since it is very difficult to take the various design condition into account. The present paper points out on the basis of the experimental results, the influences of the state of wave-dissipating blocks on the wave pressures at several cross sections of a breakwater, and the stochastic characteristics of obtained data was examined. 1) The covering condition of wave-dissipating blocks makes a significant influence of the wave pressure acting on the block layer. 2) When the impulsive wave breaking is generated, wave pressure p1 on the still water level becomes proportional to the square of the wave height. Then the numerical wave flume (CADMAS-SURF/2D) was applied for the covering state of wave-dissipating blocks.

    DOI: 10.2208/kaigan.65.816

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  • 数値波動水槽と構造物変形計算との連成計算手法に関する研究 Reviewed

    有川太郎, 浜口一博, 北川和士, 鈴木智憲

    土木学会論文集B2(海岸工学)   65 ( 1 )   866 - 870   2009.11

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    This report describes development of the numerical wave tank, called CADMAS-SURF/3D, coupled with the structure analysis based on FEM. The objective of this research is to clarify the stability of this numerical system. In this system, FEM receives the pressure from CADMAS, on the other hand CADMAS uses the porosity changed from displacements of structures. At first, wave paddle model was tried for confirming the stability of variation of porosity. The results of numerical waves were good agreement with the results of experiments. Then, coupling model was tested by using the wall and sea wall model. Through these results, the stability of this numerical system was verified.

    DOI: 10.2208/kaigan.65.866

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  • 3次元数値波動水路を用いた防波堤堤頭部の被覆材移動による被災の検討 Reviewed

    近藤圭央, 有川太郎, 関克己, 村川はるみ

    土木学会論文集B2(海岸工学)   65 ( 1 )   861 - 865   2009.11

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    The rubble mound of composite breakwaters is usually covered with armor stones or armor concrete blocks. However the damage of armor units is almost appeared at the breakwater head. The minimum weights of the armor units at the breakwater head is 1.5 times the value of the breakwater trunk. This paper aims to elucidate the damage mechanism of armor units at the breakwater head of a composite breakwater by numerical simulation with a 2 or 3-dimensional numerical wave tank `CADMAS-SURF' under regular wave action. Numerical results are compared with experimental data. At the last, the numerical wave tank is applied to real disaster of the armor units of the composite breakwater.

    DOI: 10.2208/kaigan.65.861

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  • 消波工のノリ止め機能を有する堤頭部ケーソンの安定性に関する研究 Reviewed

    国栖広志, 田中和広, 吉田賀一, 田中健一郎, 迫節夫, 有川太郎, 村上啓介

    土木学会論文集B2 (海岸工学)   65 ( 1 )   811 - 815   2009.11

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    A new type structure of break water head covered with wave dissipation blocks was proposed to slash the construction cost. This structure is simply to set a caisson with longer width than a trunk caisson, which can decrease the number of wave dissipation blocks by making use of the longer end-wall of the head caisson. Three dimensional hydraulics model tests were carried out to solve various technical issues regarding the stability and safety of this structure. It was clarified that the current design standard of port facilities is partially applicable to determine the structural dimension, and careful attention must be paid to the depression of crown height of wave dissipation blocks.

    DOI: 10.2208/kaigan.65.811

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  • 消波ブロック被覆堤における消波工被覆状態の静水面波圧に及ぼす影響—Influence on wave pressures of wave-dissipating block state on breakwater with wave-dissipating block layer

    関 克己, 有川 太郎, 水谷 雅裕

    港湾空港技術研究所報告 = Report of the Port and Airport Research Institute / 港湾空港技術研究所 編   48 ( 3 )   3 - 21   2009.9

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  • Numerical Modeling of Hydrodynamics on A Salt Marsh Reviewed

    T. Suzuki, T. Arikawa, M. Stive

    Proceedings of Coastal Dynamics 2009   1 - 14   2009.9

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  • Structural Behavior Under Impulsive Tsunami Loading Reviewed

    有川太郎

    Journal of Disaster Research   4 ( 6 )   377 - 381   2009.8

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  • 遡上津波力によるコンクリート壁面の変形・破壊挙動に関する実験

    有川 太郎

    コンクリートテクノ = Journal of concrete technology   28 ( 8 )   15 - 18   2009.8

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  • Large Scale Simulations on Impulsive Wave Pressuress by using CADMAS-SURF/3D Reviewed

    T. Arikawa, T. Yamano, M. Akiyama

    Coasts, Marine Structures and Breakwaters 2009   2009.6

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  • スパイクノイズ処理を有する数値波動水槽による衝撃砕波圧の計算—Application of treatment for spike-noise in Numerical Wave Tank computing impulsive wave pressure

    有川 太郎, 山野 貴司

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1175 )   1 - 22   2009.3

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  • 緊急時浮上式津波防波堤の開発--浮力浮上式鉛直鋼管システム—Development of urgently emerging tsunami breakwater: buoyancy-driven vertical piling system

    高山 知司, 有川 太郎, 西村 大司

    沿岸技術研究センター論文集   ( 10 )   5 - 11   2009

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  • 津波による海岸被害の予測方法の改良 Reviewed

    山本吉道, Wibool Wutthiyan, 有川太郎

    海岸工学論文集   55   301 - 305   2008.11

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    The following improvements on tsunami damage predicting are examined in order to decrease the tsunami damage: 1) It is checked that the destructive evaluation of buildings of a wide area due to tsunami can be efficiently performed with the numerical model which can calculate a flood of only land area with good accuracy and the gate type Rahmen model. 2) The limit of inundation height that human-beings can stand up to tsunami is obtained using data of a large-scale model experiment. This limit is determined by a slide and changes in the range of 20cm-40cm with sex and height. 3) When the overflow of tsunami occurs on the land area of a steep slope, a strong back-flow will occur. Therefore, a calculating method which can be used for the stable examination against it is also proposed.

    DOI: 10.2208/proce1989.55.301

    DOI: 10.2208/kaigan.67.72_references_DOI_9JG9x4sjwlVhWWhSbyqXv9aZ1Uq

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  • 2007年ソロモン諸島沖の地震津波の現地被害調査と数値計算 Reviewed

    富田孝史, 有川太郎, 辰巳大介, 本多和彦

    海岸工学論文集   55   1406 - 1410   2008.11

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    The Solomon Islands Earthquake Tsunami was generated by a big earthquake of M8.1 on 2 April 2007, and caused severe damages particularly in western islands of the Solomon Islands, resulting in the death toll of 52. To understand tsunami characteristics and damages, a field survey was conducted. Measured tsunami inundation height was approximately 4-5 m at the north part of Simbo Island and at the south coast of Ghizo Island. Human losses were, however, mitigated by residents' evacuation to hills and high-floored houses soon after the earthquake occurrenceand as soon as they watched the tsunami travelling in the offshore. Numerical simulations were also conducted to estimate and understand the tsunami. The effect of reefs in coastal areas was additionally investigated from the numerical simulations.

    DOI: 10.2208/proce1989.55.1406

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  • 津波力による壁・柱部材の変形・破壊に関する大規模実験 Reviewed

    有川太郎, 中野史丈, 下迫健一郎, 山野貴司

    海岸工学論文集   55   261 - 265   2008.11

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    Indian Ocean Tsunami 2004 made us to recognize of the power of the huge tsunami. To clarify the mechanism of failure due to tsunami and to make the assessment tool are important not only for the forecast of damage but also for the evaluation of evacuation towers. If the large tsunami occurs, large impulsive bore force may attack on. the land structure near the coastline. But, the behavior of structures against such power is still unsolved. In this report, the physical model tests are conducted to clarify the mechanism of failure of concrete wall due to the impulsive tsunami power. Several types of concrete walls and brick typ.walls with column are tested. From the results, the failure mode of walls against the impulsive tsunami power was clarified qualitatively.

    DOI: 10.2208/proce1989.55.261

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  • 浮上型の模型を用いた直立浮上式防波堤に関する大規模実験 Reviewed

    有川太郎, ほか

    海岸工学論文集   55   906 - 910   2008.11

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    This report describes the results of the large scale model tests on the buoyancy-driven vertical piling breakwater by using the buoyancy-driven piles. This breakwater consists of rows of steel pip. piles and each pile consists of upper and lower steel pipes. The overall performance of this breakwater has been verified, but the relation between stress and wave power is not cleared at the part of lap joint between upper pipes and lower pipes, at which large stress may be occurred. So, the large scale model tests by using the buoyancy-driven piles were conducted. Main results of this paper are that movement of the upper pile under waves is confirmed and the relationship between the strain at the lap part and the wave power is clarified qualitatively.

    DOI: 10.2208/proce1989.55.906

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  • 数値波動水槽を用いた衝撃波圧に関する大規模計算 Reviewed

    有川太郎, 山野貴司

    海岸工学論文集   55   26 - 30   2008.11

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    This report describes large-scale simulations on impulsive wave pressures using CADMAS-SURF/3D (SUper Roller Flume for Computer Aided Design of MAritime Structure in 3D), which is a three-dimensional numerical wave tankunder development. This code is also adapted to the parallel computing system and multi grid size system. Prediction ofimpulsive wave pressure using empirical formula is one of difficult problems. So, the tool for the practical use is neededto solve this problem. In this report, the validity of this model for predictions of impulsive wave pressures is verified.Large scale simulations are conducted by using the field data and the occurrence of impulsive wave pressures is discussed. At the last, the calculation cost is reported for the practical use.

    DOI: 10.2208/proce1989.55.26

    DOI: 10.2208/jscejoe.67.i_625_references_DOI_QTQFvTCmXOBoPGmeOxlbwdOHdjV

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  • 避難途中に津波によって溺れる危険性の検討 Reviewed

    高橋重雄, 酒井洋一, 森屋陽一, 内山一郎, 遠藤公彦, 有川太郎

    海洋開発論文集   24   159 - 164   2008.7

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    The primary objective of tsunami disaster mitigation is to reduce the casualties. The major cause of the deaths is drowning by tsunami current, especially during evacuation. In the paper, the causes of deaths are discussed through reference to past experiences. A fault tree is presented to summarize the physical danger posed by tsunami waves to the human body, and the personal danger is discussed based on the tree. The stability of the human body against wave front collision and tsunami currents is discussed and threshold conditions are proposed. The time for evacuation is usually very limited and the risk of encountering a tsunami during evacuation is often high. Walking in inundated areas during a tsunami attack is especially dangerous. Vertical evacuation is highly recommended.

    DOI: 10.2208/prooe.24.159

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  • 波の遡上に対するCADMAS-SURFの適用性の検証 Reviewed

    桜庭雅明, 榊山 勉, 有川太郎, ほか

    海洋開発論文集   24   867 - 872   2008.7

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    CADMAS-SURF is a useful numerical model to design maritime structure. Applicability of CADMAS-SURF for predictions of breaking waves or irregular waves has been studied. However, there are not many studies about the wave run-up problems. It is necessary to investigate the applicability of CADMAS-SURF for predictions of wave run-up.<BR>This paper presents an investigation for applicability of CADMAS-SURF for predictions of wave run-up. In order to verify the accuracy of CADMAS-SURF, CADMAS-SURF was applied to several wave run-up conditions. The computational results are compared with the experimental results to show the validity and efficiency of CADMAS-SURF. In order to compare the numerical results using different mesh size, several numerical studies were carried out. The present study proposed the calculation conditions for numerical simulation.

    DOI: 10.2208/prooe.24.867

    DOI: 10.2208/kaigan.75.i_733_references_DOI_Jb5Mv10gw3tyvDpTmssSPoeeFYc

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  • 直立浮上式防波堤の実海域実証試験 Reviewed

    有川太郎, ほか

    海洋開発論文集   24   93 - 98   2008.7

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    An innovative ‘buoyancy-driven vertical piling breakwater’ is under development to protect harbor facilities against high waves and tsunamis. This breakwater consists of rows of steel pipe piles and each pile consists of upper and lower steel pipes. The movable performance and hydraulic characterisitics of the breakwater have been verified by the large scale hydraulic model tests. In addition, the performance of the breakwater in the sea has to be clarified for its realization.<BR>This paper reports the results of the field experiment by a real scale structure. The results clearly demonstrate that: 1) The fabrication accuracy and the placing accuracy of the steel pipes were excellent; 2) The rising time of the breakwater in the waves was within a few minitues; 3) The transmission mechanism of the wave force from the upper pipe to the lower pipe has been proven; 4) The marine growth around the upper pipe was little.

    DOI: 10.2208/prooe.24.93

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  • 2007年ソロモン諸島津波の現地調査報告—Report of field survey on 2007 Solomon Islands Tsunami

    富田 孝史, 有川 太郎, 辰巳 大介

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1179 )   2 - 41   2008.6

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  • Tsunami Damage in Solomon Islands in April 2007 Reviewed

    T. Tomita, T. Arikawa, D. Tatsumi, K. Honda

    31st International Conference on Coastal Engineering   ( 910 )   1300 - 1312   2008.6

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  • Structural Performance Test of Walls against Tsunami Reviewed

    T. Arikawa, K. Shimosako, S. Takahashi

    International Conference on Port Ccastal and Ocean Engineering   2007.12

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  • 遡上津波によるコンテナ漂流力に関する大規模実験 Reviewed

    有川太郎, 大坪大輔, 中野史丈, 下迫健一郎, 石川信隆

    海岸工学論文集   54   846 - 850   2007.11

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    This report investigates the impact force of drifting container due to surge front tsunamis. Because the impact force depends on the material and rigidity of the objects, the 1/5 scale model experiments are conducted with container made of steel and concrete wall. First, effect of the material and rigidity, impact force tests in the air are conducted. Then, the velocity of drifting container is checked. Finally, the drifting container impact force tests due to surge front tsunami are conducted. The empirical formula based on Hertz theory is applied to the impact force results. It indicates that this formula can evaluate the impact force under this report condition.

    DOI: 10.2208/proce1989.54.846

    DOI: 10.20965/jdr.2021.p1045_references_DOI_XbTgBZ3d926awcpSxcqk7V9pMPt

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  • 混成堤における滑動を考慮した信頼性設計法の高精度化に関する検討 Reviewed

    下迫健一郎, 千田奈津子, 有川太郎, 山野貴司

    海岸工学論文集   54   901 - 905   2007.11

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    While the research on the deformation-based reliability design of composite breakwaters has been carried out for many years, sliding phenomena including rocking motion have not been carefully examined. In this study, hydraulic model experiments were conducted in a wave flume to investigate the characteristics of wave forces and sliding phenomena of the breakwater caisson. The difference of static friction coefficient and dynamic one should be considered in order to improve the estimation accuracy. Numerical simulation (CADMAS-SURF) can reproduce the time series of wave forces more precisely compared to the practical model used in the current calculation method, especially in deep water area.

    DOI: 10.2208/proce1989.54.901

    DOI: 10.2208/jscejb.65.246_references_DOI_IWmhrKsSoOfaT1wvjHzMJzpGxJq

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  • 数値波動水槽における砕波変形計算の高精度化 Reviewed

    有川太郎, 山野貴司, 秋山実

    海岸工学論文集   54   71 - 75   2007.11

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    This report describes advanced deformation scheme for breaking waves, and the results of breaking wave simulation. A three-dimensional numerical wave tank was developed. This code is also adapted to the parallel computing system and multi grid size system, so that the problem is more efficiently solved. This code is called ‘CADMAS-SURF/3D’(SUper Roller Flume for Computer Aided Design of MAritime Structure in 3D). At first, the accuracy of prediction of breaking point was checked in the wave flume, and the validity was verified due to comparison of the Goda's breaking index. Then, the performance of 3 dimensional breaking problems was tried. Two types of submerged breakwater were installed in our Tank. Results were qualitatively good agreement with experiments.

    DOI: 10.2208/proce1989.54.71

    DOI: 10.20965/jdr.2021.p1286_references_DOI_YAmwOe4EewUvHoEhMF3Bi2tFII5

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  • 遡上津波力による構造物の変形・破壊挙動の検討 Reviewed

    有川太郎, 中野史丈, 大坪大輔, 下迫健一郎, 石川信隆

    海岸工学論文集   54   841 - 845   2007.11

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  • 直立浮上式防波堤による現地津波防護効果に関する検討 Reviewed

    有川太郎, ほか

    海岸工学論文集   54   936 - 940   2007.11

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    This research investigates the protection performance against tsunami with the buoyancy- driven vertical breakwater by using the numerical simulations. Macro-Micro scale interlocked tsunami simulator named STOC (Storm surge and Tsunami simulator in Oceans and Coastal areas) has been applied to the series of simulations. Results of comparison of tsunami height in the Wakayama-shimotsu port and Fukura port due to Tokai, Tonankai and Nankai earthquakes indicates that this new breakwater decreases tsunami height and inundation area. Although the dissipating rate is depending on the position of this breakwater, the breakwater with 10% opening brings a 33% decrease in the maximum tsunami height.

    DOI: 10.2208/proce1989.54.936

    DOI: 10.2208/kaigan.75.i_805_references_DOI_H62efivBwebYaJ0DtM3eF8RyCh1

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  • 津波力について

    ( 6 )   13 - 18   2007.7

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  • 直立浮上式防波堤の津波・風波に対する水理特性—Hydraulic characteristics of buoyancy-driven vertical piling breakwater for tsunami and wind wave

    有川 太郎, 中野 史丈, 野村 逸人

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1156 )   2 - 21   2007.6

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  • Large Model Tests and Numerical Simulation of Surge Front Tsunami Force Reviewed

    T. Arikawa

    Fourth International Conference on Urban Earthquake Engineering   2007.3

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  • 津波力に関する研究

    有川 太郎

    港湾空港技術講演会講演集 / 国土交通省国土技術政策総合研究所, 港湾空港技術研究所 監修   2007年度   21 - 27   2007

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  • HYDRAULIC CHARACTERISTICS OF BUOYANCY-DRIVEN VERTICAL PILING BREAKWATER FOR TSUNAMI AND WIND WAVE BY LARGE SCALE MODEL TEST

    ARIKAWA Taro, SHIMOSAKO Kenichiro, KOBAYASHI Makoto, TORAISHI Tatsuhiko, ARAI Kiyoshi, KIHARA Kazuyoshi

    PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN   23   117 - 122   2007

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    An innovative ‘buoyancy-driven vertical piling breakwater’ is under development to protect harbor facilities behind the breakwater against tsunamis and high waves. This breakwater consists of rows of steel pipe piles and each pile consists of upper and lower steel pipes. Upper steel pipe is normally encased in lower steel pipe which driven into seabed and thus there small gap exists between upper pipes. When tsunami or high wave is predicted, the upper pipes quickly rise up to the water surface driven by the buoyancy of air supplied into the upper pipes.<BR>A few experimental researches have been conducted on the hydraulic characteristics of this type of breakwater with gaps. In this study, hydraulic model experiments and numerical simulations were carried out to investigate the wave transmission through the breakwater and wave pressures acting on the upper pipes. As a result of the study, the breakwater's performance against tsunamis and high waves has been verified.

    DOI: 10.2208/prooe.23.117

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  • 遡上津波力に関する大規模実験 Reviewed

    有川太郎, ほか

    海岸工学論文集   53   796 - 800   2006.11

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  • 護岸・陸上構造物に対する津波力の大規模実験 Reviewed

    有川太郎, 池辺将光, 山田文則, 下迫健一郎, 今村文彦

    海岸工学論文集   52   746 - 750   2005.11

  • 3次元数値波動水槽における津波波力に対する適用性の検討 Reviewed

    有川太郎, 山田文則, 秋山実

    海岸工学論文集   52   46 - 50   2005.11

  • インド洋大津波のスリランカ南西部における津波実態・被害調査報告 Reviewed

    富田孝史, 有川太郎, 安田誠宏, 今村文彦, 河田惠昭

    海岸工学論文集   52 ( 52 )   1406 - 1410   2005.11

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    DOI: 10.2208/proce1989.52.1406

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  • Damage Caused by the 2004 Indian Ocean Tsunami on the Southwestern Coast of Sri Lanka Reviewed

    富田孝史, 有川太郎, 安田誠宏, 今村文彦, 河田惠昭

    Coastal Engineering Journal   48 ( 2 )   99 - 116   2005.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:World Scientific  

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  • インド洋地震津波の被害例について--タイにおける事例を中心として

    平石 哲也, 有川 太郎, 南 靖彦

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1106 )   2 - 20,図巻頭2p   2005.9

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  • 備える 可動式防波堤開発への取組み--フラップ式構造物および直立浮上式防波堤

    シモサコ ケンイチロウ, アリカワ タロウ

    46 ( 8 )   50 - 55   2005.8

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  • 直立浮上式防波堤の開発 Reviewed

    山根隆行, 有川太郎, ほか

    海洋開発論文集   21   115 - 120   2005.7

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    Buoyancy-driven vertical piling breakwater-a new type of breakwater formed by upper and lower steel pipes rises above sea level by feeding the air into the upper pipe when high waves or tsunamis are imminent, whereas it normally rests inside the lower pile installed below seabed so that navigation is undisturbed. This paper outlines the results of a series of experiments by a large scale physical model and of the numerical analyses with regard to the rising/sinking behavior of the breakwater. The results clearly demonstrate that: 1) The time required for raising the upper pipe is just a few minutes, being rapid enough to prevent tsunamis from attacking harbors; and 2) The numerical model gives good approximation and is fairly applicable.

    DOI: 10.2208/prooe.21.115

    DOI: 10.2208/jscejoe.75.i_7_references_DOI_NLnMzgMfvxT26hO9vmaJ88G4HAQ

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  • 消波ブロックによるケーソン壁面押し抜きせん断破壊に関する研究

    有川 太郎, 池辺 将光, 大嵜 菜々子

    港湾空港技術研究所報告 = Report of the Port and Airport Research Institute / 港湾空港技術研究所 編   44 ( 1 )   43 - 83   2005.3

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  • 人工津波実験について

    有川 太郎

    港湾荷役   50 ( 6 )   609 - 614   2005

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    Language:Japanese   Publisher:港湾荷役機械システム協会  

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  • ケーソン壁面の押し抜きせん断破壊に対する設計手法の提案および対策の検討 Reviewed

    有川太郎, 池辺将光, 大嵜菜々子, 下迫健一郎

    海岸工学論文集   51   741 - 745   2004.11

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    DOI: 10.2208/proce1989.51.866

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  • 消波工衝突によるケーソン壁面破壊に関する実験的研究 Reviewed

    有川太郎, 大嵜菜々子, 池辺将光, 下迫健一郎

    海岸工学論文集   51   866 - 870   2004.11

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    DOI: 10.2208/proce1989.51.741

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  • CADMAS-SURFを用いた衝撃波力計算への適用性

    有川 太郎, 下迫 健一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute / 港湾空港技術研究所 編   ( 1081 )   2 - 13   2004.6

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  • 消波工によるケーソン壁面衝突力に関する大規模実験 Reviewed

    有川太郎, 織田朋哉, 黒田豊和, 下迫健一郎

    海岸工学論文集   50   716 - 720   2003.11

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    DOI: 10.2208/proce1989.50.716

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  • Numerical simulation of hydraulic overflow pressure acting on the structures behind the seawall Reviewed

    T. Arikawa, K. Shimosako

    Coastal Structures 2003   606 - 618   2003.8

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  • 非線形緩勾配方程式を用いた計算手法の解説と計算事例

    平成14年度 ブシネスクモデルによる波浪変形計算に関する勉強会 勉強会資料   pp. 46-50   2003

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  • コンピュータによるバーチャル水槽の実現に向けて

    雑誌「作業船」   No.265,pp.20-25   2003

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  • 越波時における護岸後背地構造物に作用する流体力に関する実験的研究 Reviewed

    有川太郎, 田中信行, 黒田豊和, 下迫健一郎

    海岸工学論文集   49   656 - 660   2002.11

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    DOI: 10.2208/proce1989.49.656

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  • 非線形緩勾配方程式を用いた屈折・回折・砕波変形モデルの開発 Reviewed

    有川太郎, 岡安章夫

    海岸工学論文集   49   26 - 30   2002.11

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    DOI: 10.2208/proce1989.49.26

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  • Wave Runup Modeling Using Velocity Potential Based on Nonlinear Mild-Slope Equations Reviewed

    T. Arikawa, A. Okayasu, M. Isobe

    28th International Conference on Coastal |rn|Engineering   pp. 942-954   942 - 954   2002.7

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  • Hydrodynamic pressures by overtopping waves over seawalls with low crown height

    TECHNO-OCEAN 2002   2002

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  • PIV解析を用いた現地海浜流の計測システムの開発 Reviewed

    有川太郎, 鈴木高二朗

    海岸工学論文集   48   101 - 105   2001.11

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    DOI: 10.2208/proce1989.48.101

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  • VOF法を用いた衝撃砕波圧の計算と適用性 Reviewed

    有川太郎, 磯部雅彦, 高橋重雄

    海岸工学論文集   48   831 - 835   2001.11

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    DOI: 10.2208/proce1989.48.831

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  • Numerical Simulation of Stem Waves Along Wave-Dissipating Breakwater Reviewed

    T. Arikawa, M. Isobe

    4th International Symposium on Ocean Wave Measurement and Analysis   864 - 873   2001.9

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  • 非線形緩勾配方程式を用いた砕波・遡上計算モデルの開発 Reviewed

    有川太郎, 磯部雅彦

    海岸工学論文集   47   186 - 190   2000.11

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    DOI: 10.2208/proce1989.47.186

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  • 多方向不規則波の砕波8条件に関する研究 Reviewed

    大橋弘明, 有川太郎, 磯部雅彦, 渡辺晃

    海岸工学論文集   47 ( 56-60 )   66 - 70   2000.11

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    DOI: 10.2208/proce1989.47.66

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  • 非線形緩勾配方程式を用いた任意反射率を持つ構造物周辺の入・反射波浪共存場の解析 Reviewed

    有川太郎, 磯部雅彦

    海岸工学論文集   46   56 - 60   1999.11

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    DOI: 10.2208/proce1989.46.56

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  • 非線形緩勾配方程式を用いた砕波モデルの構築 Reviewed

    有川太郎, 磯部雅彦

    海岸工学論文集   45   141 - 145   1998.11

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    Language:Japanese   Publisher:土木学会  

    DOI: 10.2208/proce1989.45.141

    CiNii Research

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  • 非線形緩勾配方程式を用いた砕波判定法の適用性 Reviewed

    有川太郎, 磯部雅彦

    海岸工学論文集   44   91 - 95   1997.11

  • 非線形緩勾配方程式に基づく屈折・回折・砕波変形モデルの開発

    東京大学 学位論文、2000, P.115.  

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Books

  • どうする!?巨大津波

    有川太郎( Role: Sole author)

    日本評論社  2015.3 

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    Total pages:388   Language:Japanese   Book type:Scholarly book

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  • Post-Tsunami Hazard, Advances in Natural and Technological Hazards Research Vol.44

    Santiago-Fandi?o Vicente, rn|Kontar Yevgeniy, Kaneda Yoshiyuki( Role: Joint authorChapter 14:A Consideration Aimed at Improving the Resiliency of Protective Structures against Tsunami)

    Springer  2014.11 

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  • 津波から生き残る その時までに知ってほしいこと

    土木学会津波小委員会( Role: Joint author1章1.2節:津波の破壊力を知っていますか)

    土木学会  2009.11 

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    Responsible for pages:6-9   Language:Japanese   Book type:Scholarly book

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  • TSUNAMI─津波から生き延びるために

    一般財団法人, 沿岸技術研究センター 「TSUNAMI, 出版編集委員会( Role: Joint author1章1.2節(5):カハワの災害)

    沿岸センター丸善プラネット  2008.12 

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    Responsible for pages:37-41   Language:Japanese   Book type:Scholarly book

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  • 津波辞典

    首藤伸夫, 佐竹健治, 松冨英夫, 今村文彦, 越村俊一( Role: Joint author4-1-1 波力|rn|(a)波圧と波力|rn|(c)衝撃段波波圧)

    朝倉出版  2007.11 

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    Responsible for pages:162,163-166   Language:Japanese   Book type:Scholarly book

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MISC

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Presentations

  • Development and Application of High Refining Tsunami Inundation Simulation

    T. Arikawa, T. Tomita

    The 1st International Conference on Computational Engineering and Science for Safety and Environmental Problems  2014.4 

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  • Accuracy and effectiveness of tsunami inundation analysis by using coupling method named STOC-CADMAS

    T. Arikawa, T. Abe, S. Koshimura, T. Tomita

    26th International Tsunami Symposium  2013.9 

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  • Development of Solid-Gas-Liquid 3-Phase Calculation System Coupling CADMAS-SURF/3D and DEM

    T. Arikawa

    The 3rd International Conference Nonlinear Waves  2013.6 

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    Language:English   Presentation type:Oral presentation (general)  

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  • Development of high refining tsunami inundation simulation

    T. Arikawa

    The 17th Workshop on Sustained Simulation Performance - Toward Future HPC Technologies  2013.3 

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  • 東日本大震災を踏まえた防護施設のあり方

    有川太郎

    第17回「震災対策技術展」  2013.2 

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  • 津波防災・減災としての防護施設のあり方とHPCIに期待すること

    有川太郎

    第2回 HPCI戦略プログラム分野3シンポジウム| 防災・減災に資する地球変動予測  2012.12 

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  • Tsunami and Damage to Coastal Facilities|rn|of the March 11, 2011, Tohoku, Japan Earthquake

    T. Arikawa

    15th World Conference on Earthquake Engineering  2012.9 

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  • Tsunami power |rn|-Lessons from The Great East Japan Earthquake-

    T. Arikawa

    STREPS ペルー・チリ合同シンポジウム  2012.8 

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  • Development of Urgently Emerging Tsunami Breakwater |rn|- Buoyancy-Driven Vertical Piling System -

    T. Arikawa

    I-STORM annual expert meeting  2011.10 

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  • Numerical simulation of impulsive breaking-wave pressures based on gas-liquid two phase VOF method

    T. Arikawa, M. Akiyama

    Coastal Structures 2011  2011.9 

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  • Tohoku Tsunami Damage

    T. Arikawa

    フィリピン土木学会年次大会  2011.8 

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  • Human Body Flowing Experiments by Tsunami

    T. Arikawa

    2010 International Conference on Disaster Management  2010.11 

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Awards

  • 優秀論文賞

    2013.4   港湾空港技術研究所   津波越流時における混成堤の被災メカニズムと腹付工の効果

Research Projects

  • Innovative storm surge risk assessment for coastal areas and development of adaptation strategies considering social and climate change

    Grant number:23H00215  2023.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)  Tokyo University of Marine Science and Technology

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    Grant amount: \46280000 ( Direct Cost: \35600000 、 Indirect Cost: \10680000 )

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  • インドネシアにおける災害復興で現地の学術研究機関が果たす媒介機能の活用に向けて

    Grant number:21H03680  2021.4 - 2025.3

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)  東北大学

    佐々木 大輔, 有川 太郎, 地引 泰人, 石渡 幹夫, 原 裕太

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    Grant amount: \17160000 ( Direct Cost: \13200000 、 Indirect Cost: \3960000 )

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  • Urgent and comprehensive study of 2022 Tonga submarine eruption and associated tsunami

    Grant number:21K21353  2022.2 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Special Purposes  The University of Tokyo

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    Grant amount: \24349000 ( Direct Cost: \18730000 、 Indirect Cost: \5619000 )

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  • Basic study on the advancement of the resistance law and wave force evaluation of tsunami inundation flow with sediment

    Grant number:20K05041  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)  Akita University

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    Grant amount: \4290000 ( Direct Cost: \3300000 、 Indirect Cost: \990000 )

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  • 令和元年台風19号及び台風21号による広域災害に関する総合研究

    Grant number:19K24678  2019.12 - 2022.3

    日本学術振興会  科学研究費助成事業 特別研究促進費  特別研究促進費  東京理科大学

    二瓶 泰雄, 中北 英一, 竹見 哲也, 山田 朋人, 三隅 良平, 飯塚 聡, 鈴木 真一, 仲江川 敏之, 柳瀬 亘, 立川 康人, 田中 茂信, 佐山 敬洋, 田中 智大, 朝位 孝二, 前野 詩朗, 田中 仁, 吉谷 純一, 田中 規夫, 泉 典洋, 矢野 真一郎, 森脇 亮, 赤松 良久, 内田 龍彦, 重枝 未玲, 岩崎 理樹, 清水 義彦, 小山 毅, 長谷川 兼一, 西嶋 一欽, 藤本 郷史, 毛利 栄征, 前田 健一, 岡村 未対, 卜部 厚志, 森口 周二, 蝦名 裕一, 松四 雄騎, 王 功輝, 竹林 洋史, 鈴木 素之, 田島 芳満, 佐々木 淳, 信岡 尚道, 森 信人, 有川 太郎, 鈴木 崇之, 下園 武範, 松井 正宏, 小林 文明, 畑山 満則, 牛山 素行, 佐藤 健, 梶谷 義雄

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    Grant amount: \38090000 ( Direct Cost: \29300000 、 Indirect Cost: \8790000 )

    令和元年台風19号及び台風21号(低気圧)による広域災害の被害状況・メカニズムの全容を明らかにすることを目的とし,多角的・総合的に多くの分野の専門家からなる研究グループを結成し,調査研究を行った.ここでは,①台風・低気圧による豪雨・流出現象の気象学的解明,②広域にわたる洪水氾濫災害を引き起こしたメカニズムの解明,③多発した土砂災害・土構造物破壊におけるメカニズムの解明,④強風や高潮による被害実態の解明,⑤住民の避難行動の実態と防災情報の伝達状況の把握,の5つのテーマに焦点を絞って研究を行った.その結果,①様々な降水・気象観測データ解析による 台風・低気圧の構造, 発生環境,極端豪雨発生のメカニズムを調べると共に,台風シミュレーションによる感度実験を通して極端豪雨のメカニズム・要因解明を行った.また,降水の確率評価や広域分布型流出解析による洪水発生将来予測を行った.②広域の洪水氾濫状況を明らかにするとともに,河川被害・建築物被害・農業被害について,防災,河川工学,構造,材料,環境の観点から分析した.③斜面崩壊発生状況や河川堤防等の被災状況を把握するため、踏査、原位置試験、UAV等を活用した現地調査を行い,地球物理・地形学・地盤工学など学際的視点から地盤災害メカニズムを解明した.④台風19号に伴う高潮・高波の発生・浸水状況や,家屋等の被災状況を調べると共に,近年の高潮・高波災害との比較を通じ,今次台風の特徴を抽出した.強風被害についても台風19号と台風15号の調査を通じて,今次台風の特徴を明らかにした.⑤アンケート調査などに基づいて,台風19号による避難行動の実態や人的被害の発生状況・要因や避難所対応の実態を明らかにした.
    これらの成果に関する報告書を作成・公開すると共に,報告書の中に今後の災害対策のための提言を取りまとめた.

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  • Investigation of the effects of long-term power outage due to the 2019 typhoon Faxai

    Grant number:19K24677  2019.10 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Special Purposes  Grant-in-Aid for Special Purposes  Chiba University

    Yoshihisa Maruyama

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    Grant amount: \30810000 ( Direct Cost: \23700000 、 Indirect Cost: \7110000 )

    A powerful typhoon Faxai, the 15th typhoon in 2019, made landfall in Tokyo’s neighboring Chiba Prefecture around 5:00 a.m. on September 9. It caused severe structural damage especially in the southwestern part of Chiba Prefecture. It also triggered extensive and continued power outage in Chiba Prefecture. Power supply was disrupted at approximately 640 thousand houses in Chiba Prefecture as of 10:30 am on September 9. The power failure continued for about two weeks mainly in the southern part of Chiba Prefecture. In this study, various functional and structural damage caused by this typhoon was investigated. In Japan, it is anticipated that extensive power outages may occur after the Tokyo Inland and the Nankai Trough earthquakes in the near future. This study will be helpful to establish a resilient water supply system against future earthquakes.

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  • Development of a numerical method of fluid-structure interaction for elucidation of fracture mechanism of structure by tsunami

    Grant number:18K04665  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)  Chuo University

    Kashiyama Kazuo

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    Grant amount: \4420000 ( Direct Cost: \3400000 、 Indirect Cost: \1020000 )

    In this study, we developed a solid-fluid interaction analysis system that can evaluate a series of behaviors from the generation and propagation of tsunami to the generation and propagation of cracks in structures, and the destruction of structures. For the tsunami analysis method, we applied the hybrid method developed by the authors, which uses a two-dimensional analysis method for offshore area and a three-dimensional analysis method for land area. For the analysis of concrete structures. the fragility at the interface between mortar and coarse aggregate is considered in order to simulate the generation and propagation of cracks accurately. Furthermore, in order to realize the large scale simulation, a parallel computational method is introduced. The validity of this system has been verified by comparing with the experimental results.

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  • Design and social implementation of integrated mitigation system for tsunami disasters

    Grant number:17H01293  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  Tokyo University of Marine Science and Technology

    Okayasu Akio

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    Grant amount: \44070000 ( Direct Cost: \33900000 、 Indirect Cost: \10170000 )

    The purpose of this research is to propose a comprehensive disaster prevention and mitigation policy by performing benefit evaluation that takes into account the long-term changes in the local economy and society associated with the measures as well as the direct risk reduction measures such as coastal seawalls/dykes and town relocation. A review of the concept of examination of seawall height, quantification of the relationship between tsunami scale and occurrence frequency, probabilistic estimation method of storm surge, inundation depth estimation by flood simulation, evaluation of resilience of protective facilities, quantification of the effects of hard and soft measures, social implementation issues in the decision process of measures, economic evaluation, externality evaluation, etc. were examined with case studies. The results are being compiled as "Technical Guidelines for Coastal Conservation Facility Development Plan against Tsunami".

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  • Collapse mechanism of buildings by Tsunami waves after response to earthquake motions

    Grant number:26249079  2014.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  The University of Tokyo

    Kabeyasawa Toshimi, MATSUYAMA MASAFUMI

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    Grant amount: \39650000 ( Direct Cost: \30500000 、 Indirect Cost: \9150000 )

    Hydraulic collapse tests were conducted on scaled specimens of reinforced concrete building structures including the effects of seismic vibration and floating wreckage. Soft first-story structures were tested under soliton wave with or without preceding shake table tests in 2014. It was experimentally verified that residual damages due to the prior ground shaking could increase the possibility of collapse by tsunami loading later on. Open frame structures were tested under continuous waves and with floating wreckage in 2016. The wave loads were measured and analyzed from the tests which increased drastically due to obstruction by the wreckage against the wave flow through openings. Static loading tests were also conducted to measure the rigorous capacities of the specimens in 2015 and 2017. A method of evaluating design wave loading on tsunami evacuation buildings is proposed reflecting the experimental results and associated analyses.

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  • A STUDY ON EVALUATION METHOD OF TSUNAMI LOAD BASED ON THE COLLAPSING LOAD OF THE STRUCTURES

    Grant number:25289192  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)  National Institute for Land and Infrastructure Management

    Kabeyasawa Toshikazu, KABEYASAWA Toshimi, INOUE Namihiko, ARIKAWA Taro

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    Grant amount: \18200000 ( Direct Cost: \14000000 、 Indirect Cost: \4200000 )

    The hydraulic test and the static loading test is carried out on the 1/20 scaled reinforced concrete standing wall specimens in order to evaluate the nonlinear response of the structure under the wave load. The different overturning moment strength is given by the position of the tensile rebar, while the specimen has identical shape. The strong specimen shows elastic response, and the weak specimen overturned by the identical tsunami wave load. The standard specimen deformed, but restore its original position after the yielding of the tensile rebar. The impulsive load was observed at the tip of the wave, and it was not effective to the strain of the tensile steel rebar. The overturning moment is consistent with the moment calculated with the hydrostatic wave pressure of water height in front of the specimen at lower water level, but it saturates the constant value when the water height shows three times higher than the inundation depth of wave without the object.

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  • Comprehensive Research for Quantification of Tsunami Load and Improvement of Tsunami Resistanse of Building Structures

    Grant number:24246093  2012.10 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  The University of Tokyo

    NAKANO Yoshiaki, ARIKAWA Taro, CHOI Ho, MATSUKAWA Kazuto, FUJIMA Koji, OKUDA Yasuo, TAKAHASHI Noriyuki, FUKUYAMA Hiroshi

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    Grant amount: \43940000 ( Direct Cost: \33800000 、 Indirect Cost: \10140000 )

    1) Experimental and analytical studies of structural responses due to tsunami debris impacts were carried out and its practical evaluation method was established. 2) An evaluation formula for residual axial capacity of reinforced concrete column damaged by tsunami debris impacts was proposed and its accuracy was verified. 3) Numerical translation methods of damage, crack width and length, observed in scaled reinforced concrete specimen to those in full-scale members were proposed to apply laboratory test results for predicting material deterioration after tsunami inundation.

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  • damage mechanism of bridge structures by huge tsunami and the proposal of countermeasures

    Grant number:24246079  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  Nagaoka University of Technology

    MARUYAMA Kyuichi, ARIKAWA Taro, MIZUTANI Norimi, HAYASHI Kazuhiko, TANAKA Yasushi, WATANABE Ken, FUJIMA Koji, HOSODA Akira, CHIJIWA Nobuhiro, SHIGIHARA Yoshinori

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    Grant amount: \46280000 ( Direct Cost: \35600000 、 Indirect Cost: \10680000 )

    Acting force on bridge structures due to huge tsunami was studied through large scale hydraulic test, 3D computational fluid dynamics and tsunami wave propagation analysis. In addition to lift by staircase wave and solitary wave, hydrodynamic force both in steady and unsteady flow is evaluated quantitatively. Evaluation equation was verified with data set of bridge structures attacked by the 2011 off the Pacific coast of Tohoku Earthquak tsunami. Limitation of evaluation equation was also recognized.
    Computational fluid dynamic program which is able to simulate the movement of bridge structures was developed with use of coupling technique between solid, gas, and liquid phase. The effect of strengthening method is able to be evaluated by the AEM software which deals with fracture and large deformation of structures.

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  • 「海岸構造物に作用する波力の数値解析手法の開発」 構造物に波が作用する際、空気塊を巻き込み、非常複雑な場となる。 そういった場合に精度良く解析できる数値計算手法を開発する。

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    Grant type:Competitive

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  • "Development of Numerical Method for Calcutationg Waves Pressure Acting on Coastal Structures" When Waves are Acting on Coastal Atructures, There are Large Amount of Aeration the Accurate Numerical Method for Calculating Waves Pressure Under Such Co・・・

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    Grant type:Competitive

    "Development of Numerical Method for Calcutationg Waves
    Pressure Acting on Coastal Structures"
    When Waves are Acting on Coastal Atructures, There are Large
    Amount of Aeration the Accurate Numerical Method for Calculating
    Waves Pressure Under Such Complex Fields in Developed.

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Allotted class

  • 2023   力学実験   Department

  • 2023   卒業研究Ⅰ   Department

  • 2023   卒業研究Ⅱ   Department

  • 2023   固体・流体の科学   Department

  • 2023   数学演習   Department

  • 2023   流体力学   Department

  • 2023   流体力学演習   Department

  • 2023   海岸・港湾工学   Department

  • 2023   海岸水理学   Department

  • 2023   環境解析   Department

  • 2023   Global Sustainability Science特別演習Ⅰ   Graduate school

  • 2023   Global Sustainability Science特別演習Ⅱ   Graduate school

  • 2023   チャレンジプログラム   Graduate school

  • 2023   沿岸防災学   Graduate school

  • 2023   海岸水理学   Graduate school

  • 2023   都市人間環境学特殊論文研修Ⅰ   Graduate school

  • 2023   都市人間環境学特殊論文研修Ⅱ   Graduate school

  • 2023   都市人間環境学特殊論文研修Ⅲ   Graduate school

  • 2023   都市人間環境学特殊論文研修Ⅳ   Graduate school

  • 2023   都市人間環境学特殊論文研修Ⅴ   Graduate school

  • 2023   都市人間環境学特殊論文研修Ⅵ   Graduate school

  • 2023   都市人間環境学特論A   Graduate school

  • 2023   都市人間環境学論文研修第一   Graduate school

  • 2023   都市人間環境学論文研修第三   Graduate school

  • 2023   都市人間環境学論文研修第二   Graduate school

  • 2023   都市人間環境学論文研修第四   Graduate school

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