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Studies on Management of Riverbed Geomorphology for Restoration ofReservoir Dam Impacts on Tail Water Ecosystem

Yasuhiro TAKEMON, Kentaro NAKAI* and Tetsuya SUMI
* Faculty of Engineering, Kyoto University
Synopsis
Reservoir dams are known to degrade the ecological functions of riverbed in the tail water reaches byintercepting sediment in the reservoir. This paper aims at finding out a target image of riverbed
geomorphology to recover the ecological functions in the reaches. An ability of riverbed for retention oflentic plankton was adopted as an indicator for the ecological functions of riverbed and the contribution rateof plankton to suspended particulate organic matter was measured using the stable isotope techniques in thefour dam tail water reaches different in riverbed geomorphology. The result showed that the retention
efficiency was higher in the Nunome and Kumokawa River than the Kozagawa and Managawa River.
Relations of the retention efficiency to the channel configuration indicated that more meandering and narrow
channel with longer shoreline would increase the retention efficiency.
Keywords: suspended particulate organic matter, plankton, riverbed geomorphology, POM retention
efficiency, carbon and nitrogen stable isotope䇷㻌㻣㻣㻞㻌䇷