国立研究開発法人土木研究所

論文・刊行物検索

利用者の方へ

詳細情報

発表 CHARACTERISTICS OF SEDIMENT RELEASE AND DEPOSITION UNDER THE ARASE DAM REMOVAL,KUMAGAWA RIVER,JAPAN

作成年度 2018 年度
論文名 CHARACTERISTICS OF SEDIMENT RELEASE AND DEPOSITION UNDER THE ARASE DAM REMOVAL,KUMAGAWA RIVER,JAPAN
論文名(和訳)
論文副題
発表会 12th ISE(International Symposiun on Ecohydraulics)
誌名 12th ISE(International Symposiun on Ecohydraulics)
巻・号・回
発表年月日 2018/08/19 ~ 2018/08/24
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 transport associated with the Arase dam removal, first challenge of dam removal in Japan, were investigated and its properties were compared with pioneering dam removal cases in United States. In the first year when the crest of Arase dam was removed, about 26% of trapped sediment (mainly sand and gravel, including cobble size stones) in the former reservoir was washed away, forming new sandbars and channels at the downstream. However, the sediment release sharply decreased in the second year (>3% of total) despite the large amount of sediment still remaining. Rocks constituting a rapid before the dam construction appeared along with sediment runoff and affected the resistance. In terms of suspended sediment, the significant impacts were not identified. A comparison of dam removal properties showed that sediment size in the Arase Dam removal was larger than those in the US cases, although hydraulic capacities of sediment transport in floods did not differ significantly. The gaps between sediment size and actual transportability affect both sediment release rate and recovery from the dam removal impact on downstream.
ページの先頭へ

この画面を閉じる

Copyright (C) 2022 Independent Administrative Institution Public Works Research Institute