| Project/Area Number |
60850101
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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 |
ASHIDA Kazuo Disaster Prevention Research Institute,Kyoto University, 防災研究所, 教授 (30027205)
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| Co-Investigator(Kenkyū-buntansha) |
SAWADA Toyoaki Disaster Prevention Research Institute, Kyoto University, 防災研究所, 助手 (60027258)
TAKAHASHI Tamotsu Disaster prevention Research Institute, Kyoto University, 防災研究所, 教授 (40027230)
EGASHIRA Shinji Disaster Prevention Research Institute, Kyoto University, 防災研究所, 助教授 (00027286)
MIZUYAMA Takahisa Public Works Research Institute, Ministry of Construction, 土木研究所, 主任研究員
矢沢 昭夫 建設省, 土木研究所, 室長
YAZAWA Akio Public Works Research Institute, Ministry of Construction
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Sabo-Dam / Open Type Dam / Design of Debris Dam / Sediment Control / Bed Load / Debris Dam / Debris Flow / 土石流の制御 / 山地河道 / 流路水理 / 流路侵食 / 流路形態 / ダムの侵食防止 / 土砂流出調節機能 / ダムの配置計画 |
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| Research Abstract |
This project has been made to analyze the sediment control mechanism of debris dam in terms of sediment hydraulics. Three subjects, which are concerning the data analysis of actual river, the erosion control mechanism of debris dam and the mechanism of sediment transportation upstream and downstream of the dam, are chosen for consideration. The results show
(1) Data on bed variation of the Koshibu River, tributary of the Tenryu River, are collected and analyzed, and give a valuable information of bed variations in rivers where debris dams are constructed. Observational study is made in the Ashiarai River, a tributary of the Jintsu River, for the behavior of debris flow in the crib dam, and clarifies the sediment deposition from the flow.
(2) The relation between bed variations upstream of dams and sediment discharge rates from dams is discussed experimentally and theoretically in terms of widths of opening and heights of dams. A mathematical model, which is useful for the predictions of bed variation as well as of the ratio of outflowing sediment discharge to the inflowing one, is presented.
(3) The mechanisms of debris flow control are discussed in terms of open type debris dams of various kinds, and are clarified.
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