河川技術論文集
Online ISSN : 2436-6714
火山麓に見られる強酸性河川の 水質変換過程の解析:御嶽山南麓の濁川水系における現地観測から
宇佐見 亜希子田代 喬松本 嘉孝谷口 智雅八木 明彦岩月 栄治
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2020 年 26 巻 p. 7-12

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The Nigori River is strongly acidic because it has influenced by volcanic activities of Mount Ontake in Japan. In order to understand processes of water quality changes through the mixing of slightly alkaline river, the Denjo River, pH, element concentrations and flow of these rivers were observed. By joining of the Denjo River, pH was raised to near neutrality and Al, Mn, S and Fe concentrations were decreased. In contrast, the contents of these Al, Mn, S and Fe were increased. It is confirmed that at the confluence of the rivers, two effects play roles in changing the element contents. The element contents are changed due to two effects such as the precipitation of elements and the adding of elements from springs and sediments around the rivers. We found that the adding affects contents of Al, Mn, S and Fe more significantly than the precipitation does.

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© 2020 土木学会
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