Mechanism of debris flow investigated by a novel measurement technique of sediment concentrations
Project/Area Number |
18K03759
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 17030:Human geosciences-related
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Research Institution | Kyoto University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
長谷川 祐治 広島大学, 総合科学研究科, 准教授 (60342664)
中谷 加奈 京都大学, 農学研究科, 助教 (80613801)
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Project Period (FY) |
2018-04-01 – 2021-03-31
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Project Status |
Completed (Fiscal Year 2020)
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Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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Keywords | 水路実験 / 細粒土砂 / 液相 / 間隙流体 / 比誘電率計測 / 土砂濃度鉛直分布 / 構成則 / TDR / 土砂災害 / 山地渓流 |
Outline of Final Research Achievements |
We developed a technique of measuring sediment concentrations in a sediment laden flow. The measurement method was improved throughout a flume experiment. The sediment concentration measurement system was installed in a creek with frequent debris flows. Direct evidence of high ratio of sediment (0.5-0.7) in the pore fluid of a debris flow was obtained by our observation. Based on a flume experiment and simulations, we proposed a method to estimate spatiotemporal density of the pore fluid in a debris flow. Debris flow experiments with various bed conditions revealed that deposition was enhanced under conditions of unsaturated stream bed rather than saturated stream beds.
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Academic Significance and Societal Importance of the Research Achievements |
本研究で新たに明らかとなった土石流の流動中および堆積に関する知見は土石流シミュレーションの改良に資すると期待される。特にこれまでのシミュレーションで想定された到達範囲を超えるような土石流に対するシミュレーションが改善されると考えられ,ハザードマップの高度化を図ることができる。
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Report
(4 results)
Research Products
(46 results)
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[Journal Article] Advanced Hazard Information and Methods for Appropriate Evacuation during Sediment Disasters2018
Author(s)
Nakatani, K., Yamanoi, K.,, Hasegawa, Y., Hayashi, S., Miyata, S., Fujita, M
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Journal Title
Proceeding of 13th Congress INTERPRAEVENT 2018 in the Pacific Rim
Volume: -
Pages: 327-335
Related Report
Peer Reviewed / Open Access
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[Journal Article] Temporal changes of rainfall-runoff relationship after the 1984 eruption of Mt. Merapi, Indonesia2018
Author(s)
Gonda, Y., Miyata, S., Fujita, M., Legono, D., Tsutsumi, D.
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Journal Title
Proceedings of 21th IAHR-APD Congress
Volume: -
Pages: 1277-1283
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] Sediment dynamics in glacierized catchments: a comparison study from two proglacial streams in the Sulden catchment (Eastern Italian Alps)2020
Author(s)
Michael Engel, Velio Coviello, Anuschka Buter, Ricardo Carillo, Sushuke Miyata, Giulia Marchetti, Andrea Andreoli, Sara Savi, Christian Kofler, Vittoria Scorpio, Lindsey Nicholson, and Francesco Comit
Organizer
EGU General Assembly 2020
Related Report
Int'l Joint Research
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[Presentation] 現地データを用いたTDRによる浮遊砂濃度計測の検証2020
Author(s)
Shusuke Miyata, Francesco Comiti, Michael Engel, Velio Coviello, Gianluca Vignoli,Andrea Andreoli,Ricardo Carrillo, Rudi Nadalet, Masaharu Fujita
Organizer
第132 回日本森林学会大会プログラム
Related Report
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[Presentation] Advanced Hazard Information and Methods for Appropriate Evacuation during Sediment Disasters2018
Author(s)
Nakatani, K., Yamanoi, K., Hasegawa, Y., Hayashi, S., Miyata, S., Fujita, M.
Organizer
INTERPRAEVENT2018 in the Pacific Rim
Related Report
Int'l Joint Research
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[Presentation] Experimental Studies for Applicability of a Bedload Sensor with A Communicating Tube2018
Author(s)
Matsuda, S., Itoh, T., Nagayama, T., Tsutsumi, D., Miyata, S., Fujita, M., Mizuyama, T.
Organizer
INTERPRAEVENT2018 in the Pacific Rim,
Related Report
Int'l Joint Research
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[Presentation] Flash Flood Model Behavior and Model Calibration of Kali Putih and Nasiri Watershed2018
Author(s)
Rahardjo, A.P., Widowati, A.P.A., Miyata, S., Legono, D., Sujono, J.
Organizer
INTERPRAEVENT2018 in the Pacific Rim,
Related Report
Int'l Joint Research
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[Presentation] Temporal changes of rainfall-runoff relationship after the 1984 eruption of Mt. Merapi, Indonesia2018
Author(s)
Gonda, Y., Miyata, S., Fujita, M., Legono, D., Tsutsumi, D.
Organizer
21th IAHR-APD Congress
Related Report
Int'l Joint Research
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