ID | 117860 |
タイトル別表記 | FIELD SURVEYS OF EFFECTS OF THE MAINTENANCE FLOW DISCHRAGE CHANGE ON RIVER ENVIRONMENT IN THE OHYAMA RIVER
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著者 |
矢野, 真一郎
九州大学
齋藤, 正徳
九州大学
井芹, 寧
西日本技術開発
島谷, 幸宏
九州大学
緒方, 健
福岡県保健環境研究所
山崎, 正敏
福岡県保健環境研究所
清野, 聡子
東京大学
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キーワード | maintenance flow discharge
hydraulic condition
attached algae
ayu
stable isotope ratio
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資料タイプ |
学術雑誌論文
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抄録 | The maintenance flow discharge of the Ohyama River, which is located in the upper Chikugo River, had been restricted to 1.5m3/s by a hydroelectric dam. To improve the river environment, the river administrator has changed the maintenance flow discharge to 4.5m3/s in summer and to 1.8m3/s in winter. In this study, we aim at proposing an optimal control of the maintenance flow discharge for the river environment. Firstly, we carried out field surveys before and after reducing the river discharge in order to figure out effects on hydraulic conditions and attached algae. The results of the surveys show that hydraulic conditions become worse for ayu (plecoglossus altivelis) and attached algae. Also, there is a tendency to stagnate at the pool when the maintenance flow discharge decreases. Secondly, because it was reported that the length of ayu became larger than before changing the maintenance flow discharge, we attempted to analyze carbon and nitrogen stable isotope ratio of ayu and attached algae. We confirmed an obvious difference in food web structure between natural and cultured ayu.
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掲載誌名 |
河川技術論文集
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ISSN | 24366714
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出版者 | 土木学会
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巻 | 12
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開始ページ | 443
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終了ページ | 448
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発行日 | 2006-06
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権利情報 | © 2006 社団法人 土木学会
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EDB ID | |
出版社版URL | |
フルテキストファイル | |
言語 |
jpn
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著者版フラグ |
出版社版
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部局 |
理工学系
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