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ID 117859
Title Alternative
INFLUENCE ON THE RIVERBED'S BIOFILM BY THE CHANGE OF MAINTENANCE FLOW DISCHARGE
Author
Iseri, Yasushi
Yano, Shinichiro
Ishikawa, Taisuke
齋藤, 正徳
Simatani, Yukihiro
Ogata, Ken
Yamazaki, Masatoshi
Seino, Satoko
Keywords
maintenance flow discharge
attached algae
filamentous algae
microecosystem
Content Type
Journal Article
Description
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.
Journal Title
Advances in River Engineering
ISSN
24366714
Publisher
土木学会
Volume
12
Start Page
277
End Page
282
Published Date
2006-06
Rights
© 2006 社団法人 土木学会
EDB ID
URL ( Publisher's Version )
FullText File
language
jpn
TextVersion
Publisher
departments
Science and Technology