Updated on 2024/02/01

写真a

 
TEBAKARI Taichi
 
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) ( 中央大学 )

  • 修士(工学) ( 中央大学 )

Education

  • 2006.3
     

    Chuo University   doctor course   completed

  • 2002.3
     

    Chuo University   master course   completed

  • 2000.3
     

    Chuo University   graduated

Research History

  • 2021.4 - Now

    The University of Tokyo   The Graduate School of Engineering   Visiting Researcher

  • 2021.4 - Now

    Chuo University   Faculty of Science and Engineering   Professor

  • 2020.4 - 2021.3

    Institute of Industrial Science, the University of Tokyo   Research fellow

  • 2018.4 - 2021.3

    Chuo University   Research and Development Initiative

  • 2014.4 - 2021.3

    Toyama Prefectural University   Faculty of Engineering   Associate Professor

  • 2017.4 - 2020.3

    The University of Tokyo   Institute of Industrial Science

  • 2013.4 - 2015.3

    Kyoto University   Disaster Prevention Research Institute

  • 2009.4 - 2014.3

    Toyama Prefectural University

  • 2007.4 - 2009.3

    Fukuoka University   Faculty of Engineering, Department of Civil Engineering   Assistant Professor

  • 2006.4 - 2007.3

    Fukuoka University   Faculty of Engineering, Department of Civil Engineering   Research Assistant

  • 2002.4 - 2006.3

    Public Works Research Institute

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Professional Memberships

  • JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES

  • JAPAN SOCIETY OF CIVIL ENGINEERS

  • American Geophysical Union

  • Japan Geoscience Union

Research Interests

  • Groundwater

  • Thailand

  • flood management

  • Water Resources

  • Hydrology

Research Areas

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

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

Papers

  • Proposed Flood Mitigation Using Backwater in Highly Developed Watersheds with Consideration of Crop Calendars and Spatial Resolution: Toward Consensus Formation Reviewed

    Yohei Ueno, Taichi Tebakari, Keigo Noda, Kazuhiro Yoshimi

    Water   15 ( 23 )   4139 - 4139   2023.11

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In this study, we examine the possibility of proactive floodwater diversion to fields via backwater in numerical experiments using multiple elevation data products with different spatial resolutions and explore the optimal timing of water diversion from the perspective of crop calendars. This study targeted the Ida River System Land Improvement District, which has beneficiary lands on both banks of the Ida River, one of the tributaries of the Jinzu River that flows through Toyama and Gifu Prefectures in the Hokuriku and Chubu Regions of Japan. First, a comparison of the elevation data products revealed that photogrammetric data can capture microtopography, such as the footpaths between rice paddies and drainage channels around a field. Numerical experiments using two elevation data products, 5m DEM and LP-derived approximately 5m DEM, showed that flood peaks were reduced downstream in both cases using 5m DEM and LP approximately 5m DEM by directing floodwaters. Interviews with land improvement districts and a review of previous studies revealed that the ear-burst period is particularly vulnerable to flooding. Although the effect of flood peak reduction is reduced due to flooding of the field, it is possible that floodwater can be channeled during the ripening period in August and in late September and October when the ears have been harvested.

    DOI: 10.3390/w15234139

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  • A new image segmentation model for precipitation estimation using meteorological satellite infrared images and geographic information Reviewed

    Kansei Fujimoto, Taichi Tebakari

    Hydrological Research Letters   17 ( 4 )   77 - 84   2023.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Hydrology and Water Resources  

    DOI: 10.3178/hrl.17.77

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  • Estimation of External Forces Causing Flood Damage to the Namezu River, Nagano Prefecture, Japan, Caused by 2019 Typhoon Hagibis Reviewed

    42   49 - 58   2023.9

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  • A macroscopic analysis of the demographic impacts of flood inundation in Thailand (2005–2019) Reviewed

    Hinako Tsuda, Taichi Tebakari

    Progress in Earth and Planetary Science   10 ( 1 )   2023.7

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

    Abstract

    In Thailand, floods are occurring more frequently due to climate change, and recent economic development and population growth may have altered the way in which people interact with floods, including migration to other regions. In this study, we analyzed the relationship between flooding and population distribution across Thailand from 2005 to 2019 to improve measures for minimizing flood damage. We used population distribution point data from 2009 to 2019 produced by Oak Ridge National Laboratory to analyze trends in population movement and distribution, by examining whether population sizes were greater than, less than, or equal to estimated values in regions throughout Thailand. The results suggest that floods in 2011 and 2017 caused temporary migration to areas that were not inundated or to the metropolitan Bangkok area. Flood responses changed after the 2011 floods, which have been described as the worst flood in Thai history. Next, we examined the relationship between the number of regions with lower than estimated population and flood data for the previous year including precipitation, inundated area, and deaths caused by flooding. Inundation area had a significant impact on population decline, with correlation coefficients of 0.426 and 0.501 for the north and northeast, respectively. The number of deaths caused by flooding in a given year also led to a population decline in the following year. However, precipitation did not exhibit the same trend. Therefore, population demographics after floods have shown regional characteristics in recent years, with Thai people shifting from a flood-tolerance lifestyle to a flood-avoidance lifestyle, mainly in local urban areas and the metropolitan Bangkok area.

    DOI: 10.1186/s40645-023-00569-9

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    Other Link: https://link.springer.com/article/10.1186/s40645-023-00569-9/fulltext.html

  • Catalogue of 33 Reservoirs’ Operation in Thailand Reviewed

    Shunta NAKAMURA, Taichi TEBAKARI

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   36 ( 2 )   139 - 146   2023.5

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    DOI: 10.3178/jjshwr.36.1756

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  • 水害版BCP策定時のボトルネックの考察と各種対策効果の明示方法の検討 Reviewed

    奥野佑太, 呉修一, 藤下龍澄, 手計太一, 九里徳泰

    土木学会論文集B1(水工学)   78   I_1189 - I_1194   2022.12

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  • TREND ANALYSIS OF LONG-TERM RADAR RAIN GUAGES DATA AND ITS APPLICABILITY TO RIVER PLANNING IN KANTO AREA, JAPAN Reviewed

    大橋史帆里, 吉見和紘, 手計太一

    土木学会論文集 B1(水工学)(Web)   78 ( 2 )   I_367 - I_372   2022.12

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    J-GLOBAL

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  • PROPOSAL FOR ESTIMATION METHOD FOR X-BAND MP RADAR REFRECTIVITY USING THE INFRARED BANDS OF THE HIMAWARI STANDARD DATA Reviewed

    藤本寛生, 吉見和紘, 手計太一

    土木学会論文集 B1(水工学)(Web)   78 ( 2 )   I_901 - I_906   2022.12

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    J-GLOBAL

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  • Use of deep learning to identify optimal meteorological inputs to forecast seasonal precipitation Reviewed

    Shingo Zenkoji, Taichi Tebakari, Kazutoshi Sakakibara

    Hydrological Research Letters   16 ( 3 )   67 - 72   2022.9

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Hydrology and Water Resources  

    DOI: 10.3178/hrl.16.67

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  • STUDY ON PROACTIVE FLOOD WATER DIVERSION TO AGRICULTURAL LANDS USING BACKWATER CONSIDERING AGRICULTURAL CALENDAR Reviewed

    Yohei UENO, Taichi TEBAKARI, Naoki KOYAMA, Takuya MATSUURA, Keigo NODA, Masashi KIGUCHI, Taikan OKI

    Advances in River Engineering   28   373 - 378   2022.6

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  • SOCIO-ECONOMIC CHANGES AND CLIMATE CHANGE ADAPTATION MEASURES BETWEEN JAPAN AND THAILAND IN THE WATER RESOURCES SECTOR Reviewed

    Yuta NAKAZAWA, Taichi TEBAKARI

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   78 ( 5 )   I_317 - I_328   2022

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

    DOI: 10.2208/jscejer.78.5_i_317

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  • A Comparison Between Global Satellite Mapping of Precipitation Data and High-Resolution Radar Data – A Case Study of Localized Torrential Rainfall over Japan Reviewed

    Yoshiaki Hayashi, Taichi Tebakari, Akihiro Hashimoto

    Journal of Disaster Research   16 ( 4 )   786 - 793   2021.6

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    Publishing type:Research paper (scientific journal)   Publisher:Fuji Technology Press Ltd.  

    This paper presents a case study comparing the latest algorithm version of Global Satellite Mapping of Precipitation (GSMaP) data with C-band and X-band Multi-Parameter (MP) radar as high-resolution rainfall data in terms of localized heavy rainfall events. The study also obliged us to clarify the spatial and temporal resolution of GSMaP data using high-accuracy ground-based radar, and evaluate the performance and reporting frequency of GSMaP satellites. The GSMaP_Gauge_RNL data with less than 70 mm/day of daily rainfall was similar to the data of both radars, but the GSMaP_Gauge_RNL data with over 70 mm/day of daily rainfall was not, and the calibration by rain-gauge data was poor. Furthermore, both direct/indirect observations by the Global Precipitation Measurement/Microwave Imager (GPM/GMI) and the frequency thereof (once or twice) significantly affected the difference between GPM/GMI data and C-band radar data when the daily rainfall was less than 70 mm/day and the hourly rainfall was less than 20 mm/h. Therefore, it is difficult for GSMaP_Gauge to accurately estimate localized heavy rainfall with high-density particle precipitation.

    DOI: 10.20965/jdr.2021.p0786

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  • Geochemical study and fluid flow simulation of a groundwater system in Toyama and Joganji alluvial fans, central Japan, and assessment of suitability for heat utilization Reviewed

    Hiromichi Hirata, Seung-Youl Yoo, Kaname Iwatake, Taichi Tebakari, Nagisa Okakita, Jing Zhang, Akira Ueda

    Geothermics   93   102073 - 102073   2021.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.geothermics.2021.102073

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  • Flow characteristics of artesian groundwater in coastal area of Kurobe River basin, Toyama Prefecture, by long-term and spatial observation of water temperature and electric conductivity Reviewed

    Takuya Matsuura, Taichi Tebakari, Ayano Oda, Akira Ueda

    Groundwater for Sustainable Development   13   100555 - 100555   2021.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.gsd.2021.100555

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  • Impact Assessment of Reservoir Operation in the Context of Climate Change Adaptation in the Chao Phraya River Basin Reviewed

    Saritha Padiyedath Gopalan, Naota Hanasaki, Adisorn Champathong, Taichi Tebakari

    Hydrological Processes   2020.12

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

    DOI: 10.1002/hyp.14005

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  • A review of climate-change impact and adaptation studies for the water sector in Thailand Reviewed

    Masashi Kiguchi, Kumiko Takata, Naota Hanasaki, Boonlert Archevarahuprok, Adisorn Champathong, Eiji Ikoma, Chaiporn Jaikaeo, Sudsaisin Kaewrueng, Shinjiro Kanae, So Kazama, Koichiro Kuraji, Kyoko Matsumoto, Shinichiro Nakamura, Dzung Nguyen-Le, Keigo Noda, Napaporn Piamsa-nga, Mongkol Raksapatcharawong, Prem Rangsiwanichpong, Sompratana Ritphring, Hiroaki Shirakawa, Chatuphong Somphong, Mallika Srisutham, Desell Suanburi, Weerakaset Suanpaga, Taichi Tebakari, Yongyut Trisurat, Keiko Udo, Sanit Wongsa, Tomohito J. Yamada, Koshi Yoshida, Thanya Kiatiwat, Taikan Oki

    Environmental Research Letters   16 ( 2 )   023004 - 023004   2020.11

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

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    Thailand plays a central economic and policy-making role in Southeast Asia. Although climate change adaptation is being mainstreamed in Thailand, a well-organized overview of the impacts of climate change and potential adaptation measures has been unavailable to date. Here we present a comprehensive review of climate-change impact studies that focused on the Thai water sector, based on a literature review of six sub-sectors: riverine hydrology, sediment erosion, coastal erosion, forest hydrology, agricultural hydrology, and urban hydrology. Our review examined the long-term availability of observational data, historical changes, projected changes in key variables, and the availability of economic assessments and their implications for adaptation actions. Although some basic hydrometeorological variables have been well monitored, specific historical changes due to climate change have seldom been detected. Furthermore, although numerous future projections have been proposed, the likely changes due to climate change remain unclear due to a general lack of systematic multi-model and multi-scenario assessments and limited spatiotemporal coverage of the study area. Several gaps in the research were identified, and ten research recommendations are presented. While the information contained herein contributes to state-of-the-art knowledge on the impact of climate change on the water sector in Thailand, it will also benefit other countries on the Indochina Peninsula with a similar climate.

    DOI: 10.1088/1748-9326/abce80

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    Other Link: https://iopscience.iop.org/article/10.1088/1748-9326/abce80/pdf

  • SPECIAL ISSUE ON THE STORM AND FLOOD DAMAGE 2019 IN JAPAN Reviewed

    Hiromune YOKOKI, Tatsuhiko UCHIDA, Yoshihisa AKAMATSU, Shinta SETO, Shinichiro ONDA, Tomohito YAMADA, Satoshi NISHIMURA, Taichi TEBAKARI, Chikako FUJIYAMA, Hiroyuki SAKAKIBARA, Yoshinori SHIGIHARA, Satoshi YOKOJIMA

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   76 ( 1 )   153 - 158   2020.11

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    DOI: 10.2208/jscejhe.76.1_153

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  • ADCP観測における新たなノイズ除去アルゴリズムを用いた有効流速値算出手法の提案 Reviewed

    新井章珣, 手計太一, 橘田隆史, 吉川世里子, 笹川幸寛, 中村要介

    土木学会論文集B1(水工学)   76 ( 2 )   I_1015 - I_1020   2020.11

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  • 黒部川が沿岸表層水に与える影響に関する基礎的検討 Reviewed

    善光寺慎悟, 松浦拓哉, 手計太一, 千葉元, 福留研一, 畠俊郎, 新井章珣

    土木学会論文集B1(水工学)   76 ( 2 )   I_1423 - I_1428   2020.11

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  • Use of high-resolution elevation data to assess the vulnerability of the Bangkok metropolitan area to sea level rise Reviewed

    Taichi Tebakari

    Hydrological Research Letters   14 ( 4 )   136 - 142   2020.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Hydrology and Water Resources  

    DOI: 10.3178/hrl.14.136

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  • Inclusion of Jinzu River in Jinzu River Basin Public Elementary and Junior High School Songs Reviewed

    Taichi TEBAKARI, Natsuki YAMAKAWA, Osamu MAEKAWA, Tatsuo HAYASHI

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   33 ( 5 )   193 - 202   2020.9

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Hydrology and Water Resources  

    DOI: 10.3178/jjshwr.33.193

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  • タイ国家水資源マネジメント戦略20年(2018-2037)と新たな水資源法の施行 Reviewed

    手計太一

    水文・水資源学会誌   33 ( 4 )   301 - 308   2020.7

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Spatial Characteristics of Flooded Areas in the Mun and Chi River Basins in Northeastern Thailand Reviewed

    Zenkoji, Shingo, Oda, Shigehiko, Tebakari, Taichi, Archevarahuprok, Boonlert

    JOURNAL OF DISASTER RESEARCH   14 ( 9 )   1337 - 1345   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:FUJI TECHNOLOGY PRESS LTD  

    The objectives of this study are to conduct an analysis on rainfall change tendencies, calculate the inundation in the basins of Mun and Chi Rivers in the northeastern region of Thailand, and clarify the flood risk in the long term, taking the spatial characteristics of flooding into consideration. To grasp the rainfall change tendencies, two statistical analyses are conducted using the Mann-Kendall test and the generalized extreme value distribution. The inundation analysis is conducted using the Rainfall-Runoff-Inundation (RRI) model. As a result of the statistical analysis on the rainfall characteristics, it can be observed that the annual rainfall has significant increasing tendencies at the significance level of 5% in a wide area of the upper reaches. In addition, inundation calculation indicates that the maximum inundation depth and inundation area have increased in recent years.

    DOI: 10.20965/jdr.2019.p1337

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  • タイ国Chao Phraya川下流域の水理水質特性 Reviewed

    堀内雄介, 松浦拓哉, 手計太一, Sanit WONGSA

    土木学会論文集B1(水工学)   75 ( 4 )   I_415 - I_420   2019.11

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  • Characteristics of Gridded Rainfall Data for Thailand from 1981-2017 Reviewed

    Arai, Shojun, Urayama, Kazuya, Tebakari, Taichi, Archvarahuprok, Boonlert

    ENGINEERING JOURNAL-THAILAND   23 ( 6 )   461 - 468   2019.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CHULALONGKORN UNIV, FAC ENGINEERING  

    We used a spatially interpolated gridded dataset produced by the Thai Meteorological Department (TMD) to explore long-term rainfall trends. We placed data from 1981-2017 into a 0.5 grid using the Kriging method. Long-term trends in maximum daily and monthly rainfall, and total annual rainfall, were analyzed using the nonparametric Mann Kendall trend test. Chumphon, Lamphun, Nakhon, Sawan, and Buriram provinces exhibited significant positive trends in the annual maximum daily rainfall (p<0.05, p<0.01). The coastal area of Chachoengsao Province exhibited a significant negative trend (p<0.05). January rainfall showed a negative trend throughout Thailand. Annual rainfall showed a positive trend in many regions, especially in northern, northeastern, and southern areas. The eastern region exhibited a negative trend but statistical significance was not attained. The 10-, 30-, 50-, and 100-year daily rainfall probabilities were estimated using the Generalized Extreme Value method. The eastern side of the southern region exhibited remarkably high rainfall

    DOI: 10.4186/ej.2019.23.6.461

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  • 深層学習を用いた全球表面温度画像による降水量の季節予報モデルの開発 Reviewed

    善光寺慎悟, 手計太一, 榊原一紀, 松浦拓哉

    土木学会論文集B1(水工学)   75 ( 4 )   I_1207 - I_1212   2019.11

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  • In situ characteristics of bottom sediment in Ichkeul Lake, Tunisia Reviewed

    Suetsugu, Daisuke, Hata, Toshiro, Irie, Mitsuteru, Tebakari, Taichi, Kawachi, Atsushi

    EURO-MEDITERRANEAN JOURNAL FOR ENVIRONMENTAL INTEGRATION   4 ( 1 )   2019.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

    The supply of sediment to Ichkeul Lake has decreased due to the construction of several reservoirs in the upstream reaches of the rivers that flow into it. Furthermore, it is necessary to control lake sediment outflow in order to preserve the ecological balance of the lake. Soil stabilization methods could be used to prevent the erosion of bottom sediment. Therefore, this study explored the physical and mechanical condition of the lake bed in situ to aid the identification of an effective erosion prevention scheme based on solidification methods. Two locations on the lake bottom were investigated and compared: one where the sediment dried up in summer, and the other where the sediment was saturated with water throughout the year. Undisturbed samples were collected using a thin-walled stainless steel tube sampler. The shear strength and its depth distribution in the lake bed were measured using the vane shear test. The depth distributions of the shear strength at the two sampling locations studied were found to be rather different. The shear strength was highest in the surface layer at the location that was dry in summer, whereas the shear strength was lowest in the surface layer at the location that was always wet. The shear strength of the surface layer (20 mm depth) at the wet/dry location was 3.3 kPa and there was 93.1% moisture, while the shear strength at this depth at the permanently wet location was 1.8 kPa and there was 95.7% moisture. The strength of the wet/dry sediment, which underwent shrinkage when drying, was greater than that of the permanently wet sediment. This finding could facilitate the classification of areas that require soil improvement as well as the rational design of an erosion prevention plan.

    DOI: 10.1007/s41207-019-0125-x

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  • Hydrological conditions surrounding the worst drought recorded in the upper Chao Phraya River basin, Thailand Reviewed

    Shingo Zenkoji, Taichi Tebakari, Kentaro Dotani

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   75 ( 5 )   I_115 - I_124   2019.9

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  • ADCP係留ボートの構造が流速プロファイルに与える影響評価 Reviewed

    新井章珣, 手計太一, 橘田隆史, 吉川世里子, 笹川幸寛

    河川技術論文集   25   231 - 236   2019.6

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  • 分布型水収支モデルを用いた土地利用変化と気候変化が富山県域の水資源量に与える影響評価 Reviewed

    松浦拓哉, 手計太一, 冨樫聡, 緒方陸

    土木学会論文集B1(水工学)   74 ( 4 )   I_37 - I_42   2018.11

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  • 富山県における降雪量と積雪深の長期トレンド解析 Reviewed

    尾田茂彦, 松浦拓哉, 下坂将史, 手計太一

    土木学会論文集B1(水工学)   75 ( 4 )   I_73 - I_78   2018.11

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  • 河川水文観測の発展 Reviewed

    手計太一

    水文・水資源学会誌   31 ( 6 )   568 - 570   2018.11

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  • A new method of operation for the Bhumibol reservoir in the Chao Phraya basin, Thailand based on the observed accumulated areal mean rainfall Reviewed

    Masashi Shimosaka, Taichi Tebakari, Kentato Dotani, Shuichi Kure

    Journal of Japan Society of Civil Engineers   74 ( 4 )   I_1363 - I_1368   2018.11

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  • EVALUATION OF A SATELLITE-BASED RAINFALL PRODUCT FOR A RUNOFF SIMULATION OF A FLOOD EVENT: A CASE STUDY Reviewed

    Danang Dwi ADMOJO, Taichi TEBAKARI, Mamoru MIYAMOTO

    Journal of Japan Society of Civil Engineers   74 ( 4 )   I_73 - I_78   2018.11

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  • Floods in Southern Thailand in December 2016 and January 2017 Reviewed

    Tebakari, Taichi, Wongsa, Sanit, Hayashi, Yoshiaki

    JOURNAL OF DISASTER RESEARCH   13 ( 4 )   793 - 803   2018.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:FUJI TECHNOLOGY PRESS LTD  

    A large scale flood disaster occurred in Southern Thailand in December, 2016 and January, 2017, resulting in 95 deaths. The majority of the 15 provinces in Southern Thailand suffered from the disaster and extensive, long-term damage was caused which distinguished this flood event from previous flood disasters. This paper reports the findings of a field survey conducted in February, 2017 and analyzes the precipitation phenomena by using ground rainfall data as well as satellite rainfall data because there were not enough ground rain gauges set in this region. Results revealed that this precipitation event had the highest intensity out of all precipitation events occurring over the last 11 years.

    DOI: 10.20965/jdr.2018.p0793

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  • Historical change in the flow duration curve for the upper Nan River watershed, northern Thailand Reviewed

    Taichi Tebakari, Kentato Dotani, Takuma Kato

    Journal of Japan Society of Hydrology and Water Resources   31 ( 1 )   17 - 24   2018.1

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  • Study on accuracy degradation in high intensity rainfall area observed by X-band MP radar

    Hayashi Yoshiaki, Tebakari Taichi, Nagashima Ken, Hashimoto Akihiro

    Proceeding of Annual Conference   31   136 - 136   2018

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    Language:Japanese   Publisher:THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    When X-band MP radar has observed high intensity rainfall area, QPE(Quantitative Precipitation Estimation) of X-band MP radar(X-MP) can't often observe with high accuracy. In fact, QPE of X-MP has underestimated against Rain-gauge data and C-band radar data at JMA Asakura by heavy rain in the Northern-Kyushu region on July 2017. So, this study is to clarify observation characteristics of X-MP using this event such as including high intensity rainfall area. This study has used horizontal polarization (Zh) and specific differential phase shift(Kdp) as polarization parameter of X-MP.

    DOI: 10.11520/jshwr.31.0_136

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  • Water Quantity and Quality from Flowing Wells in the Kurobe River Alluvial Fan Reviewed

    松浦拓哉, 手計太一, 北隆平, 溝口俊明

    水文・水資源学会誌   30 ( 6 )   373‐385 - 385   2017.11

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  • Combining Radar and Rain Gauge Rainfall Estimates for Flood Forecasting: A Case Study in The Jinzu River Basin, Japan Reviewed

    Danang Dwi ADMOJO, Taichi Tebakari, Mamoru Miyamoto

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   73 ( 5 )   I_251 - I_259   2017.9

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  • Study on river sediments using ground-penetrating radar and remanent magnetization Reviewed

    酒井英男, 泉吉紀, 手計太一, 福岡捷二

    自然災害科学   36 ( 2 )   143‐151   2017.8

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  • Identification of Rock Type of River Gravels Using Handheld XRF Reviewed

    南優平, 丸茂克美, 手計太一, 畠俊郎

    X線分析の進歩   48 ( 48 )   186‐202 - 202   2017.3

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  • Observation System and Temporal-Spatial Characteristics of the Japan Rain-Gauge Network Reviewed

    林義晃, 手計太一, 山崎惟義

    水文・水資源学会誌   30 ( 1 )   43‐53 - 53   2017.1

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    <p>&emsp;Rain-gauge stations have been operated by many agencies, but temporal and spatial characteristics of the rain-gauge network have not been studied sufficiently. We studied the observation system and some characteristics of the rain-gauge network throughout Japan using available observed data of the Japan Meteorological Agency (JMA), the Water and Disaster Management Bureau under the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), and local governments (L-Gov).<br>&emsp;Analysis results obtained using available observed data show different installed characteristics of rain-gauge networks among L-Gov observation systems. The JMA rain-gauge network decreased to 58 rain-gauge stations during 2008-2014. Most abandoned rain-gauge stations shared common features: rain-gauge stations were installed at high altitude, with high observation and maintenance costs. Regarding historical stored rainfall data of rain-gauge networks, approximately 90 % of JMA and MLIT rain-gauge stations have less than a 40-year historical store of data, with no missing rainfall data (hourly, daily, and annual).</p>

    DOI: 10.3178/jjshwr.30.43

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  • STUDY ON FLOOD HYETOGRAPH EXCEEDING AND AFFECT ON PUBLIC SHELTERS IN TOYAMA CITY Reviewed

    下坂将史, 尾田茂彦, 手計太一

    土木学会論文集 G(環境)(Web)   73 ( 5 )   I_149‐I_155(J‐STAGE) - 155   2017

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  • STUDY ON CHARACTARISTICS OF AREAL RAINFALL USING RAIN-GAUGE DATA AND RADAR DATA IN THE TEDORI RIVER BASIN BY SEVERAL ANALYSES Reviewed

    林義晃, 手計太一, 橋本彰博

    土木学会論文集 B1(水工学)(Web)   73 ( 4 )   I_235‐I_240(J‐STAGE)   2017

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  • ESTIMATION OF RESIDENCE TIME AND RECHARGE AREA IN THE KUROBE RIVER ALLUVIAL FAN USING ENVIRONMENTAL ISOTOPE AND DISSOLVED IONS Reviewed

    松浦拓哉, 手計太一, 北隆平, 溝口敏明

    土木学会論文集 B1(水工学)(Web)   73 ( 4 )   I_67‐I_72(J‐STAGE)   2017

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  • FACTOR ANALYSIS OF GROUNDWATER SALINIZATION IN THE KUROBE RIVER ALLUVIAL FAN BY NUMERICAL EXPERIMENT Reviewed

    松浦拓哉, 手計太一, 北隆平, 溝口敏明

    土木学会論文集 G(環境)(Web)   73 ( 5 )   I_31‐I_37(J‐STAGE) - 37   2017

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  • Comparison of the observation characteristics using rain-gauge, C-band radar, X-band MP radar and GSMaP data during snowfall

    Hayashi Yoshiaki, Tebakari Taichi, Hashimoto Akihiro

    Proceeding of Annual Conference   30   69 - 69   2017

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    Heavy snowfall is one of the natural disaster, and may seriously affect the human and social economic activity. So, we have to observed as snowfall data using some the observation method such as rain-gauge station, C-band radar, X-band Multi-Parameter radar and Global Satellite Mapping of Precipitation(GSMaP).<br />The purpose of this study is clarify to the observation characteristics using rain-gauge, C-band radar, X-band MP radar and GSMaP data during heavy snowfall. In particular GSMaP data, this study used GSMaP_MVK and GSMaP_Gauge.

    DOI: 10.11520/jshwr.30.0_69

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  • Evaluation of sediment solidification ability using in situ microbial functions in Ichkeul Lake, Tunisia Reviewed

    Toshiro Hata, Irie Mitsuteru, Kawachi Atsushi, Taichi Tebakari

    Euro-Mediterranean Journal for Environmental Integration   1 ( 2 )   2016.9

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  • 黒部川扇状地における長期の流量観測データを用いた河川―地下水交流関係の評価 Reviewed

    手計太一, 北隆平, 橋本充弘, 下坂将史

    水文・水資源学会誌   29 ( 4 )   219 - 226   2016.7

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  • Numerical Simulation for Saltwater Intrusion in the Western Uchikawa River Reviewed

    SASAKAWA Yukihiro, TEBAKARI Taichi

    Journal of Japan Society of Hydrology and Water Resources   29 ( 4 )   251 - 258   2016.7

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    &emsp;The Uchikawa River (UR), located in the Hokuriku region of Japan, has water pollution and odor annoyance caused by a density current. The UR connects to the Toyama Bay at three points. Therefore, almost no flow takes place in this river. Moreover, details of the flow mechanisms of the UR are poorly understood. The UR stream regime was observed using the Acoustic Doppler Current Profiler (ADCP), which has supported simulation of the UR current mechanism using computational fluid dynamics analysis. First, ADCP observations revealed a backward current of all layers immediately before a saline wedge run up in the Western UR (WUR). Second, a simulation model was produced using the three-dimensional volume of fluid (VOF) method. Numerical analysis results show partial reproduction of the backward current of all layers.

    DOI: 10.3178/jjshwr.29.251

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  • Review of Recent Water-Related Disasters and Scientific Activities in Southeast Asia: Lessons Learned and Future Challenges for Disaster Risk Reduction Reviewed

    Kure, Shuichi, Tebakari, Taichi, Miyamoto, Mamoru

    JOURNAL OF DISASTER RESEARCH   11 ( 3 )   394 - 401   2016.6

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    This article reports on the public forum conducted by the authors at the Third United Nations World Conference on Disaster Risk Reduction, held in Sendai City, Miyagi Prefecture, Japan, from March 14 to 18, 2015. The conference included case studies of recent water-related disasters in the Southeast Asia region, reviews of academic research, and a description of the current situation about measures for risk reduction. This article also clarifies the relationship between the various recommendations proposed in the public forum and the Sendai Framework for Disaster Risk Reduction 2015-2030 (the Sendai framework), in order to identify the efforts that are necessary for the implementation of the Sendai framework.

    DOI: 10.20965/jdr.2016.p0394

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  • 複列河道における小規模洪水時の流量把握手法の提案 Reviewed

    野間口芳希, 中村詩穂, 秋田麗子, 手計太一

    土木学会論文集G(環境)   72 ( 5 )   I_321 - I_328   2016.6

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  • 流木動態の解明手法の提案とH27年連携排砂時における黒部川下流域への適用 Reviewed

    手計太一, 佐々木謙吾, 角哲也, 竹門康弘, サメ カントシュ, 小林草平, 藤田士郎, 森田賢治

    河川技術論文集   22   493 - 498   2016.6

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  • 携行型蛍光X線分析の分析限界と河川砂礫元素の局所的分布特性 Reviewed

    手計太一, 南優平, 丸茂克美, 畠俊郎

    河川技術論文集   22   37 - 42   2016.6

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  • 中小河川流域における地上雨量データと高解像度レーダデータを用いた面積雨量の比較検討 Reviewed

    林義晃, 手計太一, 山﨑惟義

    土木学会論文集B1(水工学)   72 ( 4 )   I_1231 - I_1236   2016.2

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  • Characteristics of rainfall in the Nishi-Chugoku mountains in Japan

    Kaihotsu Ichirow, Tamagawa Ichiro, Tebakari Taichi

    Proceeding of Annual Conference   29   70 - 70   2016

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    We tried to know the&nbsp;rainfall characteristics in the<br>Nishi-Chugoku mountains in western Japan analyzing the long term and intensive observation<br>period data of stations (12 stations) of AMeDAS, Kitahiroshima town, and<br>Hiroshima University.&nbsp; As a result, we<br>obtained the following things:<br>1 The rainfall amount depends on the altitude and the geomorphological opening area ratio.<br>2 The drought year depends on the rainfall amounts in July and August.<br>3 The return period of the drought year was estimated to be within 10 years.<br>4 The higher altitude stations had the higher hourly rainfall intensity in a day.<br>5 There was no remarkable difference of the 10 minutes period rainfall among all the stations.&nbsp;<br>

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  • Water source in Kurobe River basin by multivariable analysis

    Matsuura Takuya, Tebakari Taichi, Mizoguti Toshiaki, Kita Ryuuhei

    Proceeding of Annual Conference   29   98 - 98   2016

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    This study clarify water source in Kurobe River basin by multivariable analysis. Ten dissolved ions data were used for analyze characteristics of water in Kurobe River basin. AS a result Kurobe River basin showed 96.8% of characteristics until 4st principal component.

    DOI: 10.11520/jshwr.29.0_98

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  • Proposal of the learning operation method derived by historical inflow for Bhumibol reservoir in Chao Phraya River basin, Thailand

    Dotani Kentaro, Tebakari Taichi, Kure Shuichi, Pongsthakorn Suvanpimol

    Proceeding of Annual Conference   29   108 - 108   2016

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    The Chao Phraya River basin (CPRB) in Thailand had a massive flooding in 2011, which affected on not only Thai socio-economics but also global supply-chain of industrial production. &nbsp;In order to propose a new reservoir operation system on science-based which can be easily put into practice, we studied a reservoir optimum operation for Bhumibol reservoir in the CPRB. &nbsp; This paper proposed a new reservoir management method which is based on historical largest inflow and flow capacity of downstream. In this paper, the Using historical hydrological data, a usefulness of the new reservoir operation method was verified. As a result, only the operation which has biggest flood control capacity could control the flood in 2011. However, all validation cases were not able to obtain both flood control and maintaining irrigation capacity.<br>

    DOI: 10.11520/jshwr.29.0_108

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  • Fundamental Study on Difference from the Areal Rainfall Using Rain-Gauge Data and Radar Data by Local Rainfall

    Hayashi Yoshiaki, Tebakari Taichi, Hashimoto Akihiro

    Proceeding of Annual Conference   29   73 - 73   2016

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    The areal rainfall using rain-gauge data have only to observed data by the rain-gauge station as point data.<br>However, for local rainfall, such as to pass a part of river basin, the areal rainfall using rain-gauge data may not be able to estimate high accuracy.<br>Although missing data of X-band Multi-Parameter radar have more than that of C-band radar, there are not to clarify affect the areal rainfall of that radar.<br>This study was compared the areal rainfall of rain-gauge data and radar data by local rainfall.<br>Moreover, this study also have clarify to the relationship between missing data of X-MP and difference value of C-band data and X-MP data.

    DOI: 10.11520/jshwr.29.0_73

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  • タイ国Chao Phraya川流域における多雨・少雨ポテンシャルに関する研究 Reviewed

    手計太一, 道谷健太郎, 下坂将史, スヴァンピモル ポンサコーン

    土木学会論文集G(環境)   71 ( 5 )   I_269 - I_276   2015.9

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  • 蛍光X線分析を利用した河川土砂礫のマクロ的な分布特性に関する基礎的検討 Reviewed

    手計太一, 南優平, 畠俊郎

    河川技術論文集   21   71 - 76   2015.6

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  • 北陸地方におけるXバンドMPレーダの偏波パラメータの観測特性に関する研究 Reviewed

    林義晃, 手計太一, 永島健, 山﨑惟義

    土木学会論文集B1(水工学)   71 ( 4 )   I_475 - I_480   2015.2

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  • PROPOSAL AND VERIFICATION OF A NEW SIMPLE RESERVOIR OPERATION FOR LARGE SCALE RESERVOIRS IN THE CHAO PHRAYA BASIN, THAILAND Reviewed

    DOUTANI Kentaro, TEBAKARI Taichi, KURE Shuichi, SUVANPIMOL Pongthakorn

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   71 ( 4 )   I_1423 - I_1428   2015.2

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    The Chao Phraya River basin (CPRB) in Thailand had a massive flooding in 2011, which affected on not only Thai socio-economics but also global supply-chain of industrial production. The Thai government is planning watershed management for the CPRB. In order to propose a new reservoir operation system on science-based which can be easily put into practice, we studied a reservoir optimum operation for Bhumibol and Sirikit reservoirs in the CPRB. This paper proposed the new reservoir operation method that daily release discharge were decided by using the day before storage volume data. A usefulness of the reservoir operation method was verified using historical hydrological data. As a result, the proposed reservoir operation method could contribute stabilization of storage volume.

    DOI: 10.2208/jscejhe.71.I_1423

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  • SALINIZATION OF ARTESIAN WELL IN THE EDGE OF THE KUROBE RIVER ALLUVIAL FAN Reviewed

    23   95 - 101   2015

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  • NUMERICAL SIMULATION FOR THE IMPACT OF LARGE SCALE RESERVOIR OPERATION ON RIVER FLOW REGIME Reviewed

    23   47 - 54   2015

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  • BACKFLOW PHENOMENON IN THE TIP OF SALT WEDGE IN TIDAL AREA OF THE NISHI-UCHIKAWA RIVER, TOYAMA Reviewed

    23   103 - 110   2015

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  • ESTIMATION OF GROUNDWATER FLOW SYSTEM IN THE KUROBE RIVER BASIN BASED ON GROUNDWATER LEVEL AND WATER QUALITY OBSERVATIONS Reviewed

    23   111 - 116   2015

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  • Estimating permeability using the parameter estimation method in a high-permeability area of the Kurobe River alluvial fan, Japan Reviewed

    T. Tebakari, R. Kita

    7TH GROUNDWATER SYMPOSIUM OF THE INTERNATIONAL ASSOCIATION FOR HYDRO-ENVIRONMENT ENGINEERING AND RESEARCH (IAHR)   235 - 242   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:ELSEVIER SCIENCE BV  

    The parameter estimation (PEST) method was used to estimate the spatial distribution of permeability coefficients in a high-permeability area of the Kurobe River alluvial fan in Toyama Prefecture, Japan. We considered spatial resolution, estimated period, soil structure, recharge source, and boundary conditions in the model. Numerical experiments produced estimated permeability coefficients that were consistent with the observed data and those of previous studies under all conditions. However, the estimated groundwater levels were lower than those of previous studies. Spatial resolution and the number of foundation layers did not have a large effect on estimates of the vertical permeability coefficient (k(z)). However, recharge source and boundary conditions were important for estimating permeability coefficients. Finally, the estimates of specific storage (S-s) and specific yield (S-y) were similar to the observed data under all conditions. (C) 2015 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.

    DOI: 10.1016/j.proenv.2015.04.032

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  • Temporal-Spatial Distribution Characteristics of Quantitative Precipitation Estimation Accuracy using X-band Multi-Parameter Radar over the Hokuriku Region Reviewed

    HAYASHI Yoshiaki, TEBAKARI Taichi, NAGASHIMA Ken, YAMASAKI Koreyoshi

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   28 ( 5 )   221 - 232   2015

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    &emsp;This study was designed to clarify the accuracy of X-band multi-parameter radar (X-MP) over the Hokuriku region using rain gauge data and quantitative precipitation estimation (QPE) by C-band radar. Moreover, this study used results of the correlation coefficient and estimate error for QPE accuracy analysis.<br>&emsp;Temporal analysis revealed that X-MPs provide observation data with high accuracy for short-term downpours, but results for long-term and light rainfall or regions distant from the radar site were less accurate.<br>&emsp;Spatial analysis showed the X-MP data accuracy was observable with sufficient accuracy within a range of 2.25 × 2.25 km as the center of each rain gauge station. The X-MP data accuracy has less than the C-band radar data accuracy beyond a 20 km radius from the radar site.<br>&emsp;Quantitative analysis of the rainy season and snowy season, total precipitation of X-MP and C-band radar were overestimated from that of the rain gauge station, it was especially overestimated significantly during the snowy season.

    DOI: 10.3178/jjshwr.28.221

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  • OPTIMUM OPERATION SYSTEM OF LARGE-SCALE RESERVOIR FOR FLOOD CONTROL, IRRIGATION AND ENVIRONMENTAL PRESERVATION IN THE CHAO PHRAYA RIVER BASIN IN THAILAND Reviewed

    23   37 - 46   2015

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  • 土砂水路実験施設におけるハイドロフォンのノンフィルタデータ解析 Reviewed

    手計太一, 磯村慎吾, 鶴田謙次, 吉村暢也

    河川技術論文集   20   25 - 30   2014.6

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  • Accuracy of Quantitative Precipitation Estimation by X-band Multi-Parameter Radar Using Rain-Gauge Data over Hokuriku Region. Reviewed

    HAYASHI Yoshiaki, TEBAKARI Taichi, YAMASAKI Koreyoshi

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   27 ( 2 )   67 - 76   2014

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    &emsp;Most severe disasters have included extreme rainfall intensity. Consequently, it is necessary to develop rainfall observation technology that provides observations over a large area over a short-term, with high accuracy. This study was conducted to clarify the accuracy of X-band multi-parameter radar (X-MP) over the Hokuriku region using rain-gauge data collected by the Japan Meteorological Agency (JMA) and the Water and Disaster Management Bureau under the Ministry of Land, Infrastructure, Transport and Tourism (MLIT). Additionally, this study analyzed results in terms of installed altitudes of rain-gauge stations and distance from the radar site to the rain-gauge station.<br>&emsp;Results of statistical analyses show that the distance from the radar site engenders lower accuracy of the X-MP.However the X-MP data accuracy was equal to that of rain-gauge data within a 20 km radius from the radar site. Although the X-MPs provide observations with high accuracy for rainfall observation, snowfall observation was less accurate. Therefore,quantitative snowfall estimation might improve the observation accuracy of the X-MP. Examination of the Z-R relation and the KDP-R relation shows that Z-R might provide better accuracy than KDP-R beyond a 30 km radius from the radar site. Results suggest the necessity of using and analyzing more observation data.

    DOI: 10.3178/jjshwr.27.67

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  • 4種類の観測手法を用いた同時流速観測,河川技術論文集 Reviewed

    手計太一, 江蔵拓, 笹川幸寛, 小川厚次

    河川技術論文集   19   135 - 140   2013.6

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  • Effect of Tsunami induced by the 2011 off the Pacific coast of Tohoku Earthquake on groundwater Reviewed

    NAKAGAWA Kei, WADA Naoyuki, KAIHOTSU Ichiro, TOKUNAGA Tomochika, KONDO Akihiko, ONODERA Shinichi, HAYASHI Takeshi, TEBAKARI Taichi, SHIMADA Jun, KATSUMI Takeshi, MURATA Masatoshi

    Journal of Groundwater Hydrology   55 ( 1 )   21 - 28   2013.2

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    DOI: 10.5917/jagh.55.21

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  • A New Flood Hydrograph Exceeding the Designed Level Model and Problems of Unregulated Peak Discharge Reviewed

    EZO Taku, OGAWA Koji, TEBAKARI Taichi

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   69 ( 5 )   I_131 - I_136   2013

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    &nbsp;In recent years, water related disaster risks have increased all over the world, therefore both non-structural and structural measures for flood management have been carried out. However, it is difficult to take thorough measures; therefore appropriate watershed management is being reconsidered. The unregulated peak discharge that used as important value for watershed management especially flood management is calculated using historical heavy rainfall data. Quantity of rainfall data is more plenty than river discharge data, however the hyetograph need to extend for making design flood discharge and hydrologic model has uncertainty issues. This paper proposes a new making method for flood exceeding the designed level using waveform of historical flood discharge data. The Jinzu River basin was selected for this study, which is basis of social and economic in Toyama prefecture. As a result of numerical simulation, high flood risk area was clarified in this basin. Finally, the existing design flood discharge 9700 m3/s was 1/150 return period; however the value was 1/500 return period estimated using the GEV distribution in this study. As the result of comparison between 10 probability distribution functions, the calculated probable discharges had large differences.

    DOI: 10.2208/jscejer.69.I_131

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  • DISCHARGE AND WATER QUALITY CHARACTERISTICS OF FLOWING ARTESIAN WELLS IN THE KUROBE RIVER ALLUVIAL FAN, JAPAN Reviewed

    TEBAKARI Taichi, MIZOGUCHI Toshiaki, MOTOYOSHI Yuka, ZHANG Jing

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   69 ( 4 )   I_589 - I_594   2013

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    To understand the characteristics and seasonal changes in flowing artesian wells in the Kurobe River alluvial fan (KRAF), the discharge, water quality, and isotope ratio of 23 flowing wells were observed for 18 months from March 2011. This paper newly reports the monthly discharge and water quality of these flowing wells. Variation in water flow at 10-minute intervals is also presented. All wells exhibited the same seasonal changes, and no spatial difference in water quality was found. Analysis of isotope ratios indicated that three wells located on the left bank of the KRAF were recharged from difference sources than the other wells that were recharged by the Kurobe River. Comparison with previous water quality measurements taken 10 to 20 years ago showed that the water quality had not changed. However, further research is needed to clarify long-term trends of the flowing water discharges.

    DOI: 10.2208/jscejhe.69.I_589

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  • SPATIAL AND SEASONAL DIFFERENCES IN THE RESPONSE OF FLOW TO CLIMATE CHANGE IN THE CHAO PHRAYA RIVER BASIN, THAILAND Reviewed

    KURE Shuichi, TEBAKARI Taichi, OKABE Masato

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   69 ( 4 )   I_55 - I_60   2013

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    Climate changes induced by global warming are a worldwide concern. In some regions, the risk of serious floods is expected to increase under a changing climate during the 21st century. This study examined the potential impacts of climate change in the Chao Phraya River Basin (CPRB), Thailand, using the MRI-AGCM3.1 and 3.2 datasets, developed by the Meteorological Research Institute (MRI) of the Japan Meteorological Agency, as inputs to a watershed hydrologic model. The results indicated that future river discharges will increase owing to increased rainfall in the upper mountainous region and in the Nan, Yom, and Wang river basins. Furthermore, a significant increase in annual inflow to the Bhumibol reservoir was projected in the late 21st century, whereas drought conditions may occur in the Pasak River Basin in the future.

    DOI: 10.2208/jscejhe.69.I_55

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  • Impact of large-scale reservoir operation on flow regime in the Chao Phraya River basin, Thailand Reviewed

    Taichi Tebakari, Junichi Yoshitani, Pongthakorn Suvanpimol

    HYDROLOGICAL PROCESSES   26 ( 16 )   2411 - 2420   2012.7

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    The Chao Phraya River basin, the largest basin in Thailand, is located in the centre of the northern part of the country. This basin has two large-scale reservoirs: the Bhumibol Reservoir on the Ping River and the Sirikit Reservoir on the Nan River. A comparison of the annual and monthly flow regimes downstream from the reservoirs before and after reservoir development showed a constant increase in low flow and a drastic decrease in high flow. The spectrum of the daily discharge was analysed using the fast Fourier transform on data collected in the area of Nakhon Sawan and immediately downstream from the Bhumibol Reservoir after the reservoir was constructed. The flow at Nakhon Sawan had a periodic characteristic of 7? days. The water released from the Bhumibol Reservoir at hydrological station P.12 also had a periodic characteristic of 7?days. Reservoir operations have a significant impact on the hydrological cycles. The effect of human activities is evident in the spectrum analysis of recorded historical discharge data. Copyright (C) 2012 John Wiley & Sons, Ltd.

    DOI: 10.1002/hyp.9345

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  • Hydrological impact of regional climate change in the Chao Phraya River Basin, Thailand Reviewed

    Shuichi Kure, Taichi Tebakari

    Hydrological Research Letters   6   53 - 58   2012.6

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  • 洪水時高濁度下におけるADCPによる流量把握の試み Reviewed

    高椋恵, 岩本演崇, 秋田麗子, 手計太一

    河川技術論文集   18   387 - 392   2012.6

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  • HYDRAULIC CHARACTERISTICS IN TIDAL AREA OF THE UCHIKAWA RIVER DURING SALINITY INTRUSION Reviewed

    TEBAKARI Taichi

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   68 ( 4 )   I_1327 - I_1332   2012

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    To grasp the temporal change of hydraulic phenomena in tidal area of the Uchikawa River during saltwater intrusion into the river, a long-term observation was carried out using the ADCP. As a result, detailed vertical velocity distributions of two-layer flows with salt-wedge type in tidal area of the Uchikawa River were observed. It was found that saline water with weakly-mixed type made intrusions into the Uchikawa River regardless of seasonal and/or tidal effects. Especially, time series of flow velocity had periodicities during salinity intrusion. Furthermore, flows in both upper and lower layers were laminar flow and showed Fd1&asymp;0.4 in the front part of saline wedge, and then turbulent flow zone within Fd1&le;0.4, 104&le;Re1,2&le;105 was observed when fresh and saline two layers had been stable. It can be inferred from previous studies that it is possible to estimate the interfacial resistance coefficient fi using the proposed Iwasaki number &phi; function for the tidal area of the Uchikawa River.

    DOI: 10.2208/jscejhe.68.I_1327

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  • A STUDY ON SPATIAL CHARACTERISTICS OF RAIN-GAUGE NETWORK OVER JAPAN USING DIGITAL NATIONAL LAND INFORMATION Reviewed

    HAYASHI Yoshiaki, TEBAKARI Taichi, YAMASAKI Koreyoshi

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   68 ( 4 )   I_415 - I_420   2012

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    To clarify the spatial characteristics of rain-gauge network over Japan, we studied some characteristics of rain-gauge network over Japan using available data observed by the Japan Meteorological Agency (JMA), the Water and Disaster Management Bureau under the Ministry of Land, Infrastructure, Transport and Tourism (WDMB-MLIT) and Local Government (L-Gov). Additional spatial analysis was also used available digital national land information (DEM, topographical slop, land use, surface geology, major road, natural park). As a result of spatial analysis using some digital national land information and observation blank zone, more than altitude 500m area couldn't be installed rain-gauge stations. Some observation blank zones have been topographical slop were rich in ups and downs. Rain-gauge stations weren't installed in only limited land use or surface geology. Moreover, many rain-gauge stations tend to be installed near the major road. Therefore, some observation blank zones could install rain-gauge stations.

    DOI: 10.2208/jscejhe.68.I_415

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  • A FUNDAMENTAL STUDY ON WATER ENVIRONMENT IN UCHIKAWA RIVER: COMPLICATED SYSTEM OF SEAWATER AND PURIFICATION WATER Reviewed

    TEBAKARI Taichi, OKUGAWA Koji, SAKAMOTO Masaki, YASUDA Ikuko

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   67 ( 4 )   I_1663 - I_1668   2011

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    To clarify the present situation of water environment in the Uchikawa River in Toyama, field observations (water quality, flow velocity distribution and plankton sampling) have been carried out continually since 2009. Water quality in the Uchikawa River had been aggravated due to the development of well-drained paddy fields and new ports in and around the river basin from 1960s. Regardless of a water reclamation program, water quality in the Uchikawa River does not show a drastic improvement.Due to the effect of purification water from the Nishi-Uchikawa River, upward flows of seawater and vertical water quality changes in the Higashi-Uchikawa River were found from the investigation results of water quality. It was also found that the spatial distribution of plankton was influenced by the water flows. The existence of both freshwater and marine (brackish) algae in the river indicates that the resources subsidizing food web are provided through the multi-directional water flow.

    DOI: 10.2208/jscejhe.67.I_1663

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  • A FUNDAMENTAL STUDY ON OBSERVATION DENSITY OF RAIN-GAUGE NETWORK OVER JAPAN USING MULTIPLE EVALUATION INDEX Reviewed

    HAYASHI Yoshiaki, TEBAKARI Taichi, YAMASAKI Koreyoshi

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   67 ( 4 )   I_295 - I_300   2011

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    Rain-gauge stations have been operated by many agencies, thus temporal and spatial characteristics of rain-gauge network have not been studied. We studied the observation density of rain-gauge network over Japan using available data observed by Japan Meteorological Agency (JMA), the River Bureau under Ministry of Land, Infrastructure, Transport and Tourism (RB-MLIT) and local governments (L-Gov). As a result of analysis of elevation, rain-gauge stations have been installed at a constant rate by each elevation class of the topography, and Japan has no rain-gauge stations over altitude 2500m. As a result of observation density by mesh analysis, approximately 70% of rain-gauge stations could observe rainfall data. In addition, we analyzed between DID and flood/drought disaster in recent years and observation density over Japan.

    DOI: 10.2208/jscejhe.67.I_295

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  • 拡張カルマンフィルタを用いたタンクモデルパラメータの不確実性に関する研究 Reviewed

    藤本雄大, 手計太一

    水工学論文集   54   535 - 540   2010.2

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  • 黒部川扇状地における地下水位の漸減現象に関する基礎的研究 Reviewed

    手計太一

    水工学論文集   54   565 - 570   2010.2

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  • A Study on Thermal Environment Properties of the Water-Retentive Artificial Turf System Reviewed

    TEBAKARI Taichi, MARUYAMA Tatsuya, INUI Masahiro

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   23 ( 1 )   18 - 31   2010.1

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    To clarify the properties of the thermal environment of a water-retentive artificial turf system (W-ATS), we estimated the hydrologic parameters of thermal conductivity, heat capacity, and surface albedo of the W-ATS and natural grass. We measured surface temperature and evaporation of the W-ATS and natural grass using a model experiment. <BR>As the results, the properties of the thermal environment of the W-ATS were as follows. Thermal conductivity of the W-ATS was lower than that of natural grass and it is difficult for the W-ATS to convey a radiant heat to the ground. Heat capacity of the W-ATS was lower than that of natural grass, and it contributed that surface temperature change of the W-ATS is larger. Therefore, surface temperature of the W-ATS was higher than that of natural grass in the daytime and lower at the nighttime. Albedo of the W-ATS was one fourth of that of natural grass and reflected shortwave radiation from the WATS surface was lower than that from natural grass surface. These results indicate that the WATS leads to the rise of soil temperature. Furthermore, it was found that evaporation of the W-ATS was one fourth of evapotranspiration of natural grass.

    DOI: 10.3178/jjshwr.23.18

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  • 硬い底泥の巻き上げおよび浸食速度に関する実験的研究 Reviewed

    渡辺亮一, 山﨑惟義, 手計太一, 北野義則, 林義晃

    河川技術論文集   14   25 - 30   2008.6

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  • FUNDAMENTAL STUDY ON HYDRO-METEOROLOGICAL ENVIRONMENT OVER A NEW-TYPE ARTIFICIAL TURF FIELD Reviewed

    TEBAKARI Taichi, WATANABE Ryoichi, YAMASAKI Koreyoshi, INUI Masahiro

    PROCEEDINGS OF HYDRAULIC ENGINEERING   ( 52 )   265 - 270   2008

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    Fukuoka University constructed a football field using a new-type artificial turf with improved soil on May 2007 in order to mitigate urban heat-island phenomenon and urban flooding. To clarify hydrometeorological environment in the football field, we installed the hydro-meteorological observation system inside the football field. Furthermore, potential evaporation from the football field was measured using the model experiment.<BR>As a result of the hydro-meteorological observation, meteorological environment over the artificial turf was analogous with environment over natural grass. In the nighttime, air temperature over the artificial turf was about 5 degree Celsius lower than in urban area. Moreover, runoff ratio of the field was 12%-14.5% and a lag time between peaks of a flood and a maximum rainfall was 4hours. As a result of the evaporation model experiment, evaporation rate from our proposed artificial turf system was slowly and continuously during 10 days. The new-type football field contributes to the mitigation of urban heat environment and urban flooding.

    DOI: 10.2208/prohe.52.265

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  • Mitigation Effects of Thermal Environment by Watering Reviewed

    KATO Takuma, TEBAKARI Taichi, TSUCHIYA Shuichi, YAMADA Tadashi

    PROCEEDINGS OF HYDRAULIC ENGINEERING   ( 52 )   277 - 282   2008

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    We carry out the microclimate field observation collaborated closely with local residents in the downtown of Tokyo in order to study the effect of watering on urban climatic environment. Local residents sprinkled recycled water which was rainfall and/or bath water in summer. Then we measured air temperature, humidity, solar radiation, aerosol number, wind velocity and wind direction all the day. We could observe atmospheric phenomena before/after watering. The following conclusions were obtained: 1) Air temperature at almost all observation stations were started to decrease immediately after watering started. Area-averaged air temperature declined by 0.5 deg. C. After Watering, it took an average time of 60 minitues to relapse to the air temperature immediately before the sprinkling. 2) Surface temperature of roadway decreased from 50 deg. C to 40 deg. C compared between before and after Watering. Assuming the surface of roadway could be black body, long-wave radiation declined from 620 W/m^2 to 510 W/m^2 compared between before and after watering. Heat environment mitigation action by watering could be divided into &ldquo;fall of air temperature&rdquo; and &ldquo;restraint of radiation&rdquo;.

    DOI: 10.2208/prohe.52.277

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  • Assessment of Flood Control and Water Supply Abilities of Large Scale Reservoir using Numerical Experiment : A Case Study in the Chao Phraya River Basin, Kingdom of Thailand Reviewed

    TEBAKARI Taichi, YOSHITANI Junichi, SUVANPIMOL Chanchai, MIYAMOTO Mamoru, YAMADA Tadashi

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   20 ( 3 )   145 - 155   2007.5

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    We have estimated natural runoff independent of human activities using a watershed hydrological model for the Chao Phraya River basin, Kingdom of Thailand. In order to assess the flood control and water supply capacities of two large scale reservoirs, the observed daily river discharge have been compared to the estimated values. We observed that the reservoirs' operation affected not only the increase of low flow but also the stabilization of river discharge. We estimated that the peak discharge at Hydrological Station C.2 (Nakhon Sawan city), which is the most important station for water related policies, would decrease by a maximum of 57.8% of maximum discharge and an average of 42.4 % of maximum discharge due to reservoir operations. Moreover, small and middle scale flooding was decreased by about 40 % and large scale flooding was decreased by about 35 % due to the development of the two large scale reservoirs.

    DOI: 10.3178/jjshwr.20.145

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  • FUNDAMENTAL STUDY ON PROPOSAL OF A NEW FLOW DURATION CURVE Reviewed

    MANAGO Takeshi, TEBAKARI Taichi, HIRANO Fumiaki

    PROCEEDINGS OF HYDRAULIC ENGINEERING   51 ( 51 )   379 - 384   2007

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

    To understand the long term change in river flow is basic information in order to estimate water resources in region and/or watershed. One of ways to obtained above mentioned information from river flow data is the flow-duration curve. It is too difficult to grasp the condition of the watershed using the flow-duration curve because the flow-duration curve depends on rainfall. <BR>In this paper, we propose a new flow-duration curve which does not depend on rainfall. This new flow-duration curve was estimated by runoff ratio using moving average runoff and rainfall. <BR>As a result of new flow-duration curve, the difference among three case study watershed's flow regime can be observed clearly. A new flow-duration curve, which we proposed, could clarify the watershed conditions like land use and/or soil characteristics using only historical river flow and rainfall data.

    DOI: 10.2208/prohe.51.379

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  • Fundamental Study on the Effect of Controlled Landfill System on Hydrological Cycle in a Watershed Reviewed

    FUJIMOTO Yudai, TANAKA Motohiro, TEBAKARI Taichi, HIRANO Fumiaki, MATSUFUJI Yasushi

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   20 ( 6 )   530 - 538   2007

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    Human activities such as urbanization, reservoir development and deforestation affect on the watershed hydrological circulation. The purpose of this study is to clarify the impact of controlled landfill system on the watershed hydrological circulation. In this paper, the Seibu landfill system and the Zuibaiji River basin in Fukuoka prefecture was selected for this study. <BR>As a result, we observed that outflow rate of leachte treatment plant was fairly constant independent of precipitation variation. Moreover, we estimated the rain-runoff mechanism at Fukuoka Seibu (Nakata) landfill site. We suggest that the controlled landfill system is going to affect on the watershed hydrological circulation in the near future.

    DOI: 10.3178/jjshwr.20.530

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  • 社会変動を考慮した河川流量予測モデルの構築 Reviewed

    手計太一, 吉谷純一

    水文・水資源学会誌   19 ( 3 )   171 - 182   2006.5

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  • Development and Validation of Hydrological Circulation Model using MIKE11 in the Chao Phraya River Basin, Kingdom of Thailand Reviewed

    TEBAKARI Taichi, YOSHITANI Junichi, SUVANPIMOL Chanchai, MIYAMOTO Mamoru, YAMADA Tadashi

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   19 ( 3 )   212 - 220   2006.5

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    In order to assess the effect of human activities, such as land use change and large-scale reservoir development on river flow regime, we have developed a hydrological circulation model using MIKE11 for the Chao Phraya River basin. We have tested the effectiveness of this model. River discharge and water level during 1956-1962 when large-scale development had not been carried out in the Chao Phraya River basin yet were simulated using MIKE11.This model was able to estimate the river discharge and water level with a high degree of accuracy. Comparisons with the actual measurements have proved the validity of our model.

    DOI: 10.3178/jjshwr.19.212

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  • Vertical and Horizontal Structure of Air Temperature and Humidity in Urban Park Forest and its Surrounding Reviewed

    KATO Takuma, TEBAKARI Taichi, YAMADA Tadashi, HINO Mikio

    PROCEEDINGS OF HYDRAULIC ENGINEERING   50 ( 50 )   505 - 510   2006.2

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    In order to the mitigation effect on urban heated environment of urban park, the microclimate observations have been carried out in an urban park and its surrounding in Tokyo since 1998. We have installed the 17m height observation tower with the sensors to measure air temperature and humidity at each 2m within the forest during 1st-30th July 2005. And also 19 measurement systems for air temperature and humidity were installed inside and outside the forest. As a result, the existence of clearly high- temperature and humidity layers were caught in canopy layer during the daytime. This means the exchanges of latent and sensible heat were very active in the canopy layer. In night, specific humidity near the ground was higher than that of upper layer because of continued evaporation from the ground surface. Moreover, when the flux of solar radiation was less than 300W/m2 (e.g. cloudy day and nighttime), air temperature inside the forest was lower than outside the forest; maximum difference was 5 degrees Celsius. However, there was stark difference air temperature between inside and outside the forest during the sunshine daytime. We can not clearly identify the mitigation effect on urban heated environment of urban park in this field observation.

    DOI: 10.2208/prohe.50.505

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  • 大ダム建設が流況に与えた影響-タイ王国・Chao Phraya川流域を対象として- Reviewed

    手計太一, 吉谷純一

    水文・水資源学会誌   18 ( 3 )   281 - 292   2005.5

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  • Time-space trend analysis in pan evaporation over Kingdom of Thailand Reviewed

    Taichi Tebakari, Junichi Yoshitani, Chanchai Suvanpimol

    Journal of Hydrologic Engineering   10 ( 3 )   205 - 215   2005.5

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    To grasp the temporal and spatial distribution characteristics of the pan evaporation amount in the Chao Phraya River basin, in the Kingdom of Thailand, the writers performed an analysis over a period of 19 years, from 1982 to 2000, where data related to the target area were available. Geographic, seasonal, and annual changes were studied. As a result of performing trend tests on annual changes, negative trends were found in 24 out of 27 observation stations. Furthermore, nine of those locations had a significant negative trend. As a result of performing tests of concurrent rainfall over the same period, although there were positive trends in 8 locations and negative trends in 19 locations, no significant trend - either positive or negative - was obtained. This result does not match a finding that precipitation increase decreases pan evaporation in the United States, a finding that can be derived from the complementary relationship. Journal of Hydrologic Engineering © ASCE.

    DOI: 10.1061/(ASCE)1084-0699(2005)10:3(205)

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  • Mitigation Effects of Thermal Environment of Urban Area by Watering Reviewed

    TSUCHIYA Shuichi, KATO Takuma, TEBAKARI Taichi, YAMADA Tadashi

    PROCEEDINGS OF HYDRAULIC ENGINEERING   49 ( 49 )   367 - 372   2005

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

    The social experiment was carried out for the purpose of the mitigation of the heat island effect by watering on August 18th to 25th. The microclimate observation has been carried out at watering area in Eastern Tokyo. As the results, the effect of the watering on the thermal environment in urban area was evaluated as decreasing effect on temperature. The following results were obtained; 1) The temperature variation in the daytime is included to be different every site because of the dispersion of surface temperature. 2) The air temperature in the experiment area is from 2 to 9 [degree] higher than temperature in thermometer shelter by the effect of long radiation. 3) The temperature decrease instantaneously when watering starts. 4) The temperature decreases 0.66 [degree] on average, 1.93 [degree] on maximum after the watering. 5) Total amount of decreasing temperature is decreased linearly by the distance from the point of watering.

    DOI: 10.2208/prohe.49.367

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  • Foundational Study on Water Use and Flood Control Effect by the Large Scale Reservoir:A Case Study in Upper Chao Phraya River Basin, Kingdom of Thaiand Reviewed

    TEBAKARI Taichi, FUKAMI Kazuhiko, SUVANPIMOL Chanchai, MIYAMOTO Mamoru, YAMADA Tadashi

    PROCEEDINGS OF HYDRAULIC ENGINEERING   49 ( 49 )   457 - 462   2005

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

    The goal of our study is to clarify the effect of the human activities on water resources and water circulation. The Chao Phraya River basin was selected for this study. The Chao Phraya River basin, the largest basin in Kingdom of Thailand is located in central and northern part of Thailand. This basin has two large-scale dams named Bhumibol Dam across the Ping River and Sirikit Dam across the Nan Riven This large storage dams are beneficial to the country for generating electricity and discharging water for the irrigation project areas and flood mitigation on both banks of the Ping, Nan and the Chao Phraya rivers.<BR>This paper has evaluated the water usage and flood control facilities of Bhumibol Dam. As the results of comparing the annual change of monthly runoff before and after dam construction, the minimum runoff increased drastically and the maximum runoff decreased.<BR>As the results of numerical analysis, it is clarified the water usage has become stable and the high water has decreased by the operation of Bhumibol Dam.

    DOI: 10.2208/prohe.49.457

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  • Flood in 2002 in the Chao Phraya River basin, Kingdom of Thailand Reviewed

    TEBAKARI Taichi, YOSHITANI Junichi, SUVANPIMOL Chanchai

    Journal of Japan Society for Natural Disaster Science   23 ( 2 )   215 - 228   2004.2

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    The second largest flood in 2002 occurred in the Chao Phraya River basin, Kingdom of Thailand. The field survey was carried out in the middle and lower part of the Chao Phraya River basin two weeks after the peak of the flood terminated. The result indicated that middle basin, especially Ang Thong, Ayutthaya and Sing Buri cities had suffered a heavy damage. In the meantime, there was little serious damage from the inundation by river water in Bangkok city that is located in the lower basin area. The following two factors are mentioned as the reason; (1) In Bangkok, the flood discharge had been reduced by the time it reached the lower basin area because of the overtopping in the middle basin. (2) The flood discharge has been degreasing in the downstream of the Chao Phraya River basin year by year since the Bhumibol and the Sirikit dams were constructed in the upper basin. In addition, the evaluation of the provability was carried out on the flood in 2002 using the generalization extreme value distribution. The flood was estimated under the 10-year return period discharge and it turned out the flood with the high possibility of occurrence.

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  • Study on Temporal and Spatial Distribution of Pan-evaporation in the Chao Phraya River Basin and its Circumference, Kingdom of Thailand Reviewed

    TEBAKARI Taichi, YOSHITANI Junichi, SUVANPIMOL Chanchai

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   17 ( 5 )   468 - 481   2004

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    This paper aims to find out changes with temporal and spatial distribution in pan-evaporation in the Chao Phraya River in Kingdom of Thailand. The monthly pan-evaporation data during the 1982-2000 period was obtained from all-available observatories and analyzed. The following results were obtained: (1) the pan-evaporation value is the highest in the lower Chao Phraya River basin which is closer to the ocean, and its value is gradually degreases in upper basin; (2) the March-May period sees much evaporation than other months of the year; (3) and trend tests show significant decrease in pan-evaporation in 24 out of 27 observatories.<br>The trend tests on annual precipitation over the Chao Phraya River Basin in the corresponding period show that no significant decreasing or increasing trends at any stations. This result does not match a finding that precipitation increase decreases pan-evaporation in the U.S.A. (Lawrimore and Peterson; 2000), which finding can be derived from the complementary relationship (Brutsaert and Parlange; 1998). The reason for decrease in pan-evaporation without any precipitation change could be degrease in the solar radiation, which cannot be confirmed because of lack of data.

    DOI: 10.3178/jjshwr.17.468

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  • SOCIAL EXPERIMENT OF WATARING AND NUMERICAL VERIFICATION Reviewed

    KANO Manabu, TEBAKARI Taichi, KINOUCHI Tsuyoshi, SAKAKI Shigeyuki, YAMADA Tadashi

    PROCEEDINGS OF HYDRAULIC ENGINEERING   ( 48 )   193 - 198   2004

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    The large-scale social experiment, which many citizens including media representative participated for evaluating the effects of the watering on the &ldquo;Heat Island Effect&rdquo;, was carried out in Tokyo Metropolitan in Aug. 25 2003. About 14000l. water were sprinkled for about 20 minutes from noon. Air temperature and humidity were measured by moving observation system and fixed observation system at watering area in Eastern Tokyo. After the watering, the air temperature difference between outside and inside of watering area increases, and its difference was about 0.5&deg;C. Temperature of watering area is lower than the temperature of outside area of watering after the watering. The effect of the watering was verified using the numerical simulation based on MM5. As a result of this analysis, air temperature degreased 2-2.5&deg;C in watering area after the watering.

    DOI: 10.2208/prohe.48.193

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  • Effect of Large Scale Dams on Hydrological Regime in the Chao Phraya River Basin, Kingdom of Thailand Reviewed

    TEBAKARI Taichi, YOSHITANI Junichi, SUVANPIMOL Chanchai

    PROCEEDINGS OF HYDRAULIC ENGINEERING   ( 48 )   481 - 486   2004

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

    The purpose of this paper is to evaluate the effect of the human activities on water resourcesand hydrological cycle. The Chao Phraya River basin was selected for this study. The Chao Phraya River basin, the largest basin in Kingdom of Thailand is located in central and northern part of Thailand. This basin has two large-scale dams named Bhumibol Dam across the Ping River and Sirikit Dam across the Nan River. This large storage dams are beneficial to the country for generatingelectricity and discharging water for the irrigation project areas and flood mitigation on both banks of the Ping, Nan and the Chao Phraya rivers.<BR>There is no the long-term increase and decrease tendency of the precipitation. As the results of comparing the annual change of monthly runoff before and after dam construction, the minimum runoff increased and the maximum runoff degreased.<BR>As the results of spectrum analysis using FFT, after the Bhumibol dam was constructed, the daily runoff in Nakhon Sawan had period characteristics in 3.5days and 7days and the released water from the Bhumibol dam had period characteristics in 2.5days, 3.5 days and 7days. Dam operation effected on the hydrological cycle considerably.

    DOI: 10.2208/prohe.48.481

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  • Trend analysis of land use change effect on discharge in the Chao Phraya river basin Reviewed

    TEBAKARI Taichi, YOSHITANI Junichi, Khao-Uppatum Virat, Suvanpimol Chanchai

    PROCEEDINGS OF HYDRAULIC ENGINEERING   47 ( 47 )   205 - 210   2003

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    Publisher:Japan Society of Civil Engineers  

    Local scientists and engineers in Thailand have recognized and pointed out a decreasing trend in discharge in the Chao Phraya river in recent years. However, no solid data or analysis to show a decline has been reported. This study is to find trends in river discharge data and to analyze significant causes of the trend. The following results were obtained:(1) As a result of examining discharge at 10 gauging stations in the Chao Phraya river basin, the significant decline of the annual discharge is found at 8 stations out of the ten;(2) 17 out of 18 sub-basins of the Chao Phraya river basin have no tendency in annual rainfall change, but the only one sub-basin in the upper Yom river basin has tendency of declining rainfall according to the Kendall rank test at 95% significance level;(3) and it is considered that major cause of the discharge decline is a change of the land use to cropland such as the orchard from paddy field rather than rainfall.

    DOI: 10.2208/prohe.47.205

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  • 渡良瀬川上流域および裏筑波流出試験地における流出の長期的変化と森林変化との関係に関する一考察 Reviewed

    深見和彦, 手計太一, 廣瀬葉子, 松浦直, 吉谷純一

    第6回水資源に関するシンポジウム   597 - 602   2002

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    Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)  

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  • STUDY ON THE RELATIONSHIP BETWEEN LEAF TEMPERATURE OF FROREST TREES AND MICROCLIMATE IN A GREENLAND OF URBAN AREA Reviewed

    TEBAKARI Taichi, SHIMURA Koichi, YAMADA Tadashi, HINO Mikio

    PROCEEDINGS OF HYDRAULIC ENGINEERING   45 ( 45 )   265 - 270   2001

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    Publisher:Japan Society of Civil Engineers  

    The purpose of this study is to clarify the role of forest in urban area from a viewpoint of urban environment by observing the leaf temperature and micrometeorological factors, such as air temperature, wind speed, humidity, solar radiation, soil heat, and CO2 concentration. In the midsummer of August 2000, the micrometeorological observation was carried out at Koishikawa Korakuen Gardens (in Bunkyo-ku Tokyo, Japan) for a week. The following results were obtained: 1) In the daytime, the leaf temperature rapidly lowered, when some critical conditions were exceeded. In the nighttime, the air and leaf temperature were almost the same. 2) When the flux of solar radiation increased above about 400W/m2, the leaf temperature lowered linearly with it. 3) Within VPD (vapor pressure deficit) became higher than 4hPa, the leaf temperature rapidly lowered further than the air temperature. 4) Simultaneously with this, the carbon dioxide concentration began to lower.

    DOI: 10.2208/prohe.45.265

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Books

  • Handbook of Hydrology Water Resources

    ( Role: Joint editor)

    2022.9  ( ISBN:9784254261745

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    Total pages:xii, 615p, 図版 [8] p   Language:Japanese  

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  • 全世界の河川事典

    手計太一( Role: Contributor)

    丸善出版  2013.7 

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  • タイ王国の水資源開発 : 歴代為政者たちの水資源政策

    手計 太一( Role: Sole author)

    現代図書, 星雲社 (発売)  2008  ( ISBN:9784434117268

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    Language:Japanese  

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MISC

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Awards

  • 第27回地球環境シンポジウム優秀ポスター賞

    2019.9   土木学会地球環境委員会  

  • 平成17年度全国大会第60回年次学術講演会優秀講演者賞

    2005.9   土木学会  

  • 平成11年度全国大会第54回年次学術講演会優秀講演者賞

    1999.9   土木学会  

  • ベストポスター賞

    1999.8   水文・水資源学会  

Research Projects

  • Development of the optimal operation method of dam reservoirs according to national situation in the Chao Phraya River basin, Thailand

    Grant number:15H05222  2015.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  Toyama Prefectural University

    TEBAKARI TAICHI, Shimosaka Masashi, Dotani Kentaro, Horiuchi Yusuke, Zenkouji Shingo

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    Grant amount: \17290000 ( Direct Cost: \13300000 、 Indirect Cost: \3990000 )

    In 2011, massive floods occurred in the Chao Phraya River basin (CPRB) in Thailand. There is also a risk of droughts in the CPRB during the dry season. The aim of this study was to develop a science-based reservoir operation system that can easily be put into practice. To accomplish this aim, we studied the optimum operation of these two reservoirs. On the basis of our observations, we propose a new reservoir operation method for reducing the risk of droughts and floods. This method was developed and validated with the aid of historical hydrological and rainfall data. The volume of water to be released is determined by the accumulated daily rainfall data, daily inflow data, and storage volume. The reservoir operation method proposed provides better stabilization between the reservoir’s water discharge and storage volume. This reduces the risk of drought and allows for water discharge without increasing the risk of flooding in the lower section of the basin.

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  • Proposal of sustainable environmental restoration and management technology using material cycle of World Heritage Ishkeul

    Grant number:15H02634  2015.4 - 2019.3

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

    Hata Toshiro

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    Grant amount: \31460000 ( Direct Cost: \24200000 、 Indirect Cost: \7260000 )

    Ichkeul Lake which located in northern Tunisia is a UNESCO World Heritage site. In this project, we proposed a lakebed sediment surface solidification with functional liquid or functional granular materials. These solidification methods focused on the enhancement of natural urease production, which can accelerate the calcite precipitation on the lakebed surface. The main outcomes of this project as follows,1) Ishkeul Lake and inlet rivers sediment is inhabiting the specific microbes that can precipitate the calcite with urease enzyme reaction,2) Engineering control of nutrient concentration etc. can enhance the number of microbes and urease activities with target species,3)Field restration work can be carried out with two techniques such as addition of cementation solution with In-situ microbes or functional granular matial addition,4)These proposed method can be expectate with the nitrogen source slow release effect that will be occer with lakebed surface solificiation.

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  • STUDY ON GRADUAL DECREASE IN GROUNDWATER LEVELS OVER THE KUROBE ALLUVIAL FAN

    Grant number:22760376  2010.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)  Toyama Prefectural University

    TEBAKARI TAICHI

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    Grant amount: \3900000 ( Direct Cost: \3000000 、 Indirect Cost: \900000 )

    To understand the characteristics and seasonal changes in flowing artesian wells in the Kurobe River alluvial fan (KRAF), the discharge, water quality, and isotope ratio of 23 flowing wells were observed for 18 months from March 2011. This paper newly reports the monthly discharge and water quality of these flowing wells. Variation in water flow at 10-minute intervals is also presented. All wells exhibited the same seasonal changes, and no spatial difference in water quality was found. Analysis of isotope ratios indicated that three wells located on the left bank of the KRAF were recharged from difference sources than the other wells that were recharged by the Kurobe River. Comparison with previous water quality measurements taken 10 to 20 years ago showed that the water quality had not changed. However, further research is needed to clarify long-term trends of the flowing water discharges.

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Allotted class

  • 2023   インターンシップ   Department

  • 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   応用解析Ⅱ   Department

  • 2023   水文学   Department

  • 2023   水理学および構造力学演習1   Department

  • 2023   水理学1   Department

  • 2023   河川工学   Department

  • 2023   自然環境論   Department

  • 2023   都市水循環   Department

  • 2023   Global Sustainability Science特別演習Ⅰ   Graduate school

  • 2023   Global Sustainability Science特別演習Ⅱ   Graduate school

  • 2023   インターンシップ   Graduate school

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

  • 2023   地球環境モデリング概論   Graduate school

  • 2023   水と社会   Graduate school

  • 2023   河川管理論   Graduate school

  • 2023   環境の数理とモデリング   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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