1999 Fiscal Year Final Research Report Summary
Counter Measures for Debris and Flood Flows Disasters by Using Natural Woods
| Project/Area Number |
10555176
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
水工水理学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
HASHIMOTO Haruyuki Kyushu University, Department of Civil Engineering, Associate Professor, 大学院・工学研究科, 助教授 (70117216)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Yoshiharu Kyoto Huritsu University, Department of Agriculture, Associate Professor, 農学部, 助教授 (70285245)
HAYASHI Kenjiro The National Defense Academy, Department of Civil Engineering, Associate Professor, 土木工学科, 助教授
HIRANO Muneo Kyushu University, Department of Civil Engineering, Emeritus Professor, 名誉教授 (50037850)
YAMASHITA Sampei Kyushu Sangyo University, Department of Civil Engineering, Associate Professor, 工学部, 助教授 (50230420)
TAKAHAMA Junichiro Gifu University, Department of Civil Engineering, Research Associate, 工学部, 助手 (40303507)
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| Project Period (FY) |
1998 – 1999
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| Keywords | Trees / Woods / Debris Flows / Flood Flows / Sediment Flows / Natural Disasters / Natural Environments / Landscape |
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| Research Abstract |
Natural woods along the rivers and at the base of mountains have been used as the counter measures for flood and debris flows disasters. Recently, the roles of woods is noticed form the point of natural environments. It is important in river management work to take into account the influence of trees in the flow.
The results obtained in this study are as follows :
(1) Transport rate of bed and suspended loads were investigated in an open channel with cylinders installed across the whole channel width. The cylinders were placed in stagger with their equal spacing on the bed. Measurements of their transport rate agree with that without cylinders by using effective frictional velocities.
(2) Drag forces on a single cylinder of the model woods was measured in this open channel. It is found that drag coefficient of a single cylinder in the model woods becomes larger than that in a uniform flow without woods.
(3) Critical conditions for break of trees were investigated by using the debris-flow disaster reports.
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