2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 2:30 PM - 2:45 PM | RESTORATION EFFECTS OF SEDIMENT SLUICING WITH DAM OPERATION ON MACROINVERTEBRATES IN THE MIMI RIVER, JAPAN | 150 G
RESTORATION EFFECTS OF SEDIMENT SLUICING WITH DAM OPERATION ON MACROINVERTEBRATES IN THE MIMI RIVER, JAPAN
Sediment regime is recognized to determine structure and function of river ecosystems, but natural sediment regime has been lost in many rivers with dams. Dam operation of sediment sluicing that reservoir drawdown to pass sediment-laden floods through the impoundment at a high velocity to minimize deposition and provide sediment downstream the dam expects to improve sediment regime in dammed rivers. The operation has been conducted at the Saigou and Ohuchibaru dams in the Mimi River since 2017. We have investigated the restoration effects of sediment supply by the dam sluicing on lotic community including macroinvertebrates. After dam sluicing operation, case-building caddisfly Glossosoma that was little before the operation increased in several sites downstream in the Saigou dam. This genus was reported to decline downstream dams probably due to lack of very fine gravel (particle size 2-4 mm) that is suitable for building case. Sediment supply by dam sluicing could recover Glossosoma population downstream the dam. On the other hand, Glossosoma was little downstream the Ohuchibaru dam even after the operation, probably because sediment provision was not sufficient there by only one operation.
- Sediment
- Restoration
- Invertebrate
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Presenters/Authors
Daisuke Nakano
(), Central Research Institute of Electric Power Industry, d-nakano@criepi.denken.or.jp;
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Junpei Suzuki
(), Central Research Institute of Electric Power Industry, jumpei@criepi.denken.or.jp;
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Ryosuke Yamamoto
(), Central Research Institute of Electric Power Industry, r-yama@criepi.denken.or.jp;
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Masahiro Imamura
(), Central Research Institute of Electric Power Industry, mima@criepi.denken.or.jp;
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