| Project/Area Number |
61850097
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
TAKAHASHI Tamotsu Professor of the Disaster Prevention Reaerch Institute, Kyoto University, 防災研究所, 教授 (40027230)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGAWA Hajime Instructor of the Disaster Prevention Research Institute, 防災研究所, 助手 (80144393)
EGASHIRA Shinji Associate professor of the Diaster Prevention Research Institute, 防災研究所, 助教授 (00027286)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1987: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1986: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | Sediment hazard / Landslide / Debris flow / Prediction of hazardus area / 数値シミュレーション |
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| Research Abstract |
This study aims to present the methods to predict the hazardous area due to sediment runoff, which will be used to determine the areas to be evacuated or prohibitted to live.
In respect to the prediction of the quantity of sediment runoff, a seepage flow simulation method which is usable to predict the time and place of occurrence of landslides is preseeted. Scale and form of a natural dam produced by the inflow of slided sediment into the stream channel and the hydrohraph of a debris flow which is generated by collapse of the natural dam are discussed. These discussions together with so far presented debris flow hydrograph prediction method will be made good use in determining the quantity and quality of sediment runoff in the hazardous zone delineating processes.
Numerical simulation methods to predict the flooding and deposition of debris flow and mud flow are given. The applicability of these methods are proves by analysing the actual Horadani debris flow and Mt. Nevade del Ruiz huge mud flow as well as the laboratory experiments. As the hazard due to the erosion of the debris cone thus produced and redeposition downstream is another important problem to be taken into account in the hazard risk assessment, a numerical simulation model is developed. A method which can predict the particle size distribution on the surface as well as inside of debris fan is also presented.
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