| 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 |
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| Section | 一般 |
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| Review Section |
Basic Section 17030:Human geosciences-related
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| Research Institution | Kyoto University |
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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 |
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| 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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