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発表 The Function of Spur Dike on Maintenance at The Immediately Upstream of Fishway in Sabo Dam after Flood Stages

作成年度 2010年度
論文名 The Function of Spur Dike on Maintenance at The Immediately Upstream of Fishway in Sabo Dam after Flood Stages
論文名(和訳) 洪水後の魚道直上流部の維持における水制の効果
論文副題
発表会 8th International Symposium on Ecohydraulics
誌名(No./号数) International Symposium on Ecohydraulics
発表年月日 2010/09/13 ~ 2010/09/16
所属研究室/機関名 著者名(英名)
水環境保全チーム森田 茂雄(MORITA Shigeo)
日本大学理工学部安田 陽一(YASUDA Youichi)
水環境保全チーム桑原 誠(KUWAHARA Makoto)
水環境保全チーム山下 彰司(YAMASHITA Shoji)
抄録
This study aims to clarify the transport of sediment and driftwood immediately upstream from fishway in mountain streams、 physical model experiments were conducted under the unsteady flow、 and the transport of sediment and driftwood immediately upstream from fishway was investigated (Figure 1.).[*][*]In this study、 we found in the ancillary experiments that when the water level was higher than the top of inlet section of the fishway、 the flow rate passing through the inlet decreased、 and the final experiment was conducted based on an inlet section with an open structure ((H-s)/h=1.00).[*][*]The major findings of this study are as follows.[*][*]・The transport of sediment was shown immediately upstream from the fishway. In particular、 in the case of (l-ba)/b=2.0、 when L/b=1.5 was compared with L/b=4.5、 the sediment condition immediately upstream from the fishway was considerably different、 and sediment was not confirmed immediately upstream from the fishway in the case of L/b=1.5 (Figure 2.).[*][*]・The transport of driftwood was shown immediately upstream from the fishway. In particular、 in the case of (l-ba)/b=2.0、 when L/b=1.5 was compared with L/b=4.5、 the velocity vector of the water surface and trace of the driftwood were considerably different. In the case of L/b=1.5、 the separated flow at the toe of the spur dike approached the overflow section directly、 because the spur dike was near the side wall of the Sabo dam、 and all driftwood models were discharged from the overflow section (Figure 3.).
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