ID | 117859 |
タイトル別表記 | INFLUENCE ON THE RIVERBED'S BIOFILM BY THE CHANGE OF MAINTENANCE FLOW DISCHARGE
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著者 |
井芹, 寧
西日本技術開発
矢野, 真一郎
九州大学
石川, 泰助
九州大学
齋藤, 正徳
九州大学
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
attached algae
filamentous algae
microecosystem
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資料タイプ |
学術雑誌論文
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抄録 | In the Ohyama River located in the upper Chikugo River, the maintenance flow discharge has been regulated to be 4.5m3/s from mid-March to early October and 1.8m3/s in the remaining term since 2002. To assess the influence on the river ecosystem by the change of discharge, we sampled river water for analysis of nutrients and biofilm at an early development stage for identification and counting of periphyton under a microscope, at flat shallow before and after decreasing the discharge. The results show a difference of periphyton composition between not only flow conditions, but also positions, that is, the center line of stream and the side pool. Several species of Planktonic algae which are found in the upper dam was identified, and the most were dead or broken down. Thus, they would influence the ecosystem in the biofilm as an organic load. In the dead water zone, filamentous algae glowing greatly caused nutrients depletion for the short term.
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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 | 277
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終了ページ | 282
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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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