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発表 荒瀬ダム撤去事業における堆積土砂・浮遊土砂の動態に関する研究

作成年度 2017 年度
論文名 荒瀬ダム撤去事業における堆積土砂・浮遊土砂の動態に関する研究
論文名(和訳)
論文副題
発表会 河川技術に関するシンポジウム
誌名 河川技術論文集
巻・号・回 23 
発表年月日 2017/06/15 ~ 2017/06/16
所属研究室/機関名 著者名(英名)
土木研究所自然共生研究センター大槻順朗
福岡大学伊豫岡宏樹
東京理科大学二瓶泰雄
抄録
Sediment release and deposition due to a dam removal were investigated in the Arase Dam, Kumagawa River, Japan. In the first year of dam removal, about 26% of trapped sediment were washed away and it formed new sand bar and riffle on the downstream of dam but the sediment release were sharply decreased in the second year (>3% of total). The river bed stability seems to be affected by the dominant gravel and cobble size sediment and rock framework effect at the rapid which existed before dam construction. In terms of impact on suspended sediment supply, we could not monitor significant changes assumed by the dam removal. The dam removal properties were compared at the point of relation between sediment size and actual tractive force and it showed that sediment size treated in the Arase dam relatively large and it made difference of resilience for the unusual sediment supply.
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