한국수자원학회:학술대회논문집 (Proceedings of the Korea Water Resources Association Conference)
- 한국수자원학회 2011년도 학술발표회
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- Pages.17-17
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- 2011
Numerical analysis on erosion process of replenished sediment on rock bed
- Takebayashi, Hiroshi (Disaster Prevention Research Institute, Kyoto University) ;
- Yoshiiku, Musashi (Department of Hydraulic Engineering, Yachiyo Engineering CO., LTD.) ;
- Shiuchi, Makoto (Nakagawa River Office, Shikoku Development Bureau, MLIT) ;
- Yamashita, Masahiro (Nakagawa River Office, Shikoku Development Bureau, MLIT) ;
- Nakata, Yasusuke (Department of Hydraulic Engineering, Yachiyo Engineering CO., LTD.)
- 발행 : 2011.05.19
초록
As a method of countermeasure to bed degradation and armoring phenomena of bed material in the downstream area of dam reservoirs, sediment augmentation (replenished sediment) has been carried out in many Japanese rivers. In general, bed of the replenished sediment site is composed of rocks, because the site is located in the downstream area of the dams and sediment supply is very small. Bed deformation process has been researched by many researchers. As a method of countermeasure to bed degradation and armoring phenomena of bed material in the downstream area of dam reservoirs, sediment augmentation (replenished sediment) has been carried out in many Japanese rivers. In general, bed of the replenished sediment site is composed of rocks, because the site is located in the downstream area of the dams and sediment supply is very small. Bed deformation process has been researched by many researchers. However, most of them can treat movable bed only and cannot be applied to the bed deformation process of sediment on rocks. If the friction angle between the sediment and the bed surface is assumed to be the same as the friction angle between the sediment and the sediment, sediment transport rate must be smaller without sediment deposition layer on the rocks. As a result, the reproduced bed geometry is affected very well. In this study, non-equilibrium transport process of non-cohesive sediment on rigid bed is introduced into the horizontal two dimensional bed deformation model and the model is applied to the erosion process of replenished sediment on rock in the Nakagawa, Japan. Here, the Japanese largest scale sediment augmentation has been performed in the Nakagawa. The results show that the amounts of the eroded sediment and the remained sediment reproduced by the developed numerical model are
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