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タイトル: | Effects of sediment replenishment on riverbed material size distribution and attached algal biomass in the downstream reaches of a dam |
著者: | Miyagawa, Yukio Sumi, Tetsuya https://orcid.org/0000-0002-1423-7477 (unconfirmed) Takemon, Yasuhiro Kobayashi, Sohei |
著者名の別形: | 角, 哲也 竹門, 康弘 |
キーワード: | attached algae sediment deficiency riverbed disturbance flow detachment tractive force |
発行日: | 2017 |
出版者: | Japan Society of Hydrology and Water Resources |
誌名: | Hydrological Research Letters |
巻: | 11 |
号: | 2 |
開始ページ: | 114 |
終了ページ: | 120 |
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. |
著作権等: | © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
URI: | http://hdl.handle.net/2433/234982 |
DOI(出版社版): | 10.3178/hrl.11.114 |
出現コレクション: | 学術雑誌掲載論文等 |
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