Elucidation of sediment transport by sediment bypass and ecological change downstream of dam

2017 Fiscal Year Final Research Report

• Project/Area Number: 26257304
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Hydraulic engineering
• Research Institution: Kyoto University
• Principal Investigator: SUMI TETSUYA 京都大学, 防災研究所, 教授 (40311732)
• Co-Investigator(Kenkyū-buntansha): 堤 大三 京都大学, 防災研究所, 准教授 (40372552) ; 竹門 康弘 京都大学, 防災研究所, 准教授 (50222104) ; カントウシュ サメ・アハメド 京都大学, 防災研究所, 准教授 (70750800) ; 渡辺 幸三 愛媛大学, 理工学研究科(工学系), 教授 (80634435) ; 山上 路生 京都大学, 工学研究科, 准教授 (80362458)
• Research Collaborator: Boes Robert スイス連邦工科大学, チューリッヒ校水理水文氷河学研究所(ETH-VAW), 教授
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 排砂バイパストンネル / スイス / 流砂観測技術 / ハイドロフォン / 摩耗対策 / 河川環境 / 底生動物群集 / 遺伝子評価

Outline of Final Research Achievements

1. Regarding sediment bypass tunnels in Japan and Switzerland, data of the shape of tunnel, design flow velocity, gran size distributions of passing gravel, rock quality, yearly operation days, passing sediment volume, etc. were collected.
2. (1) Data on abrasion performance of Asahi Dam of Kansai Electric Power Co., Inc. was collected. We compared the prediction accuracy of abrasion prediction formula widely used in Japan (Ishibashi formula) and Swiss Federal Institute Technology. (2) In the observation technique of sediment transport rate, a plate type hydrophone has been developed which can withstand the impact of high flow velocity and large particle diameter. By physical experiments, we have determined the measurable sediment particle size range and the signal (gain) optimum for estimating sediment load. It was revealed that the detection rate of passing gravel by hydrophone is represented by saturation rate and collision rate.

Free Research Field

水工水理学