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発表 Impacts of Sediment Supply from a Dam Reservoir on Heavy Metals Concentrations in Downstream River Water

作成年度 2018 年度
論文名 Impacts of Sediment Supply from a Dam Reservoir on Heavy Metals Concentrations in Downstream River Water
論文名(和訳)
論文副題
発表会 第17回世界湖沼会議 (17th World Lake Conference)
誌名 世界湖沼会議 (World Lake Conference) プログラム・抄録集
巻・号・回
発表年月日 2018/10/15 ~ 2018/10/19
所属研究室/機関名 著者名(英名)
水質チームYuji SUZUKI
産総研(元水質チーム)Hiroyuki MANO
水質チームSatomi Mizukami-MURATA
水質チームFumiaki OGAWA
抄録
Sedimentation in a dam reservoir is one of the important issues to overcome for utilizing the reservoir over a long term[1]. In addition, interrupting continuity of sediment transport by dams may cause downstream river flows to be sediment-starved (so-called hungry water), resulting in incision of river channels and/or coarsening of the bed materials[2]. In order to solve these situations, in Japan, sediment supply from reservoirs to their downstream rivers has been attempted using approaches such as sediment augmentation, sediment flushing and sediment bypass. However, there is limited knowledge on the impacts on the water quality just after the sediment supply operation despite the assumption that chemicals such as heavy metals are accumulated on the deposited sediment at the bottom of dam reservoirs.In this study, leaching tests of heavy metals from dam reservoir sediments were conducted to evaluate the occurrences of heavy metals in river water just after sediment supply. In addition, a short-term toxicity test was conducted to determine the toxicity of manganese (Mn) to Japanese medaka (Oryzias latipes).
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