2001 Fiscal Year Final Research Report Summary
Design Method of Main Channel Bank Protection Using Riverine Vegetation
| Project/Area Number |
11555136
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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 | HIROSHIMA UNIVERSITY |
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Principal Investigator |
FUKUOKA Shoji Hiroshima University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (30016472)
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| Co-Investigator(Kenkyū-buntansha) |
SUETUGU Tadashi National Institute for Land and Infrastructure Management, River Division, Head, 国土技術政策総合研究所・河川部河川研究室, 室長(研究職)
TAMURA Hirotoshi Hiroshima University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (10335705)
WATANABE Akihide Hiroshima University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (00240474)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Vegetation groin / Reed bank / Riparian design / Cohesive soil bank / Field test / Bank widening process / Numerical |
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| Research Abstract |
(1) Hydraulic experiments were performed for various arrangements of vegetation groins. Effect of vegetation groins was proved by assessing the degree of water level rise and reduction of bed scouring. The usefulness of ripraps was investigated to prevent from washing away of vegetation groins due to scouring of their foundation.
(2) Three dimensional numerical simulation model was developed to clarify the installation effect of vegetation groins. The model was applied for laboratory and field tests of vegetation groins and showed fairly good explanation for the tests.
(3) Three years field observations of bank erosion rate showed that reed covered bank reduced considerably the rate of bank erosion during floods.
Erosive resistance of soil blocks containing reed roots put in the laboratory stream was assessed as functions of hydraulic quantities, soil property and density of reed root.
(4) The widening process of cohesive soil bank was investigated by laboratory experiments. The computation method of flow in channels with erosive bank was presented by modeling widening mechanism of cohesive bank.
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