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発表 平衡水温を用いた流域スケールの河川水温管理指標の提案

作成年度 2021 年度
論文名 平衡水温を用いた流域スケールの河川水温管理指標の提案
論文名(和訳)
論文副題
発表会 2021年度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 27 
発表年月日 2021/06/10 ~ 2021/06/11
所属研究室/機関名 著者名(英名)
河川生態チーム溝口裕太
山口大学赤松良久
芝浦工業大学宮本仁志
河川生態チーム中村圭吾
抄録
Two indices based on the equilibrium water temperature (Teq) are proposed to characterize the spatialdistribution of water temperatures in a river basin. One index is the deviation (Tw?Teq) between the annualaverages of the observed temperature (Tw) and Teq, and the other is the gradient (dTw/dTeq) obtained fromthe regression line with their monthly averages. When these indices were applied to three rivers in theChugoku region of Japan, the gradient showed a clear increasing trend from the headwaters to the rivermouth (or confluences of the main river in the case of tributaries) with little influence of river structures.In addition, the gradient could detect effects such as spring water and water released from dams, whichhave low seasonal variations in temperature. The deviation showed a decreasing trend along to the rivermouth, but in some cases, it increased when Teq changed more than Tw.
本文表示【https://doi.org/10.11532/river.27.0_289】
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