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論文投稿 Effects of sediment replenishment on riverbed material size distribution and attached algal biomass in the downstream reaches of a dam

作成年度 2017 年度
論文名 Effects of sediment replenishment on riverbed material size distribution and attached algal biomass in the downstream reaches of a dam
論文名(和訳)
論文副題
発表会
誌名 Hydrological Research Letters
巻・号・回 11 2
発表年月日 2017/11/01
所属研究室/機関名 著者名(英名)
Aqua Restoration Research Center, Public Works Research Institute, JapanYukio Miyagawa
Disaster Prevention Research Institute, Kyoto University, JapanTetsuya Sumi
Disaster Prevention Research Institute, Kyoto University, JapanYasuhiro Takemon
Disaster Prevention Research Institute, Kyoto University, JapanSohei Kobayashi
抄録
Sediment replenishment is an effective method for resupplying depleted sediment and detaching overgrown algae in the downstream reaches of a dam. In this study, we used empirical data to examine the effects of sediment replenishment on bed material size and algal biomass in the downstream reaches of the Futase Dam, Chichibu City, Saitama Prefecture, Japan. Assuming that algae detach from bed materials when they are moved by water flow, we calculated the tractive force on the riverbed (τ) and allotted a threshold bed material size in motion (Dcri) for each given τ. The resulting bed material in the downstream reaches of the dam in any year was typically finer than that in the previous year when flooding in the rainy season transported a large volume of sediment. Algal biomass was lower when monthly Dcri exceeded 2 mm, versus when it was less than 2 mm. These results suggest that replenishment of fine bed materials accelerates algal detachment and restricts the accumulation of algal biomass by reducing bed stability.
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