2024 Volume 80 Issue 16 Article ID: 23-16086
Hydropower is important as a CO2-free energy source that can maintain stable output in the long run. On the other hand, reservoir sedimentation management is one of the most important issues in ensuring the sustainability of hydropower operation. As sedimentation management in hydropower dams, sediment sluicing operation has been introduced in some dams. However, sufficient knowledge for optimizing the operation has not been obtained. In this study, we summarize effects of sediment sluicing operation obtained so far at the Setoishi Dam, which has been conducted the operation in stages. we also study on the impact of the heavy rainfall in July 2020 that occurred during the oparation. In this paper, we discusse the ratio of flood water depths above river bed and spillway crest elevation, which is an index for easily estimating effects of the operation. we also elucidate reservoir sediment transportation due to the operetion including the heavy rain in July 2020 with numerical analysis and field data.
