2025 Volume 81 Issue 16 Article ID: 24-16130
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. Additionally, “Dam Upgrading” that maximizes the use of the CO2-free energy and “Sediment Environment Restoration” that both extends the life of dams and improves rivers and coasts are important. In this paper, we considered the relationship between sediment transportation and habitat environments in downstream of a dam, with the aim of improving reservoir sediment management that consider the river environment downstream of a dam. The study focuses on the Futatsuno Dam, where sediment replenishments is planned, we conducted 1D riverbed variation analysis, and analyzed the result of environmental research of the river. As a result, we found that it is possible to formulate an optimal sediment replenishment plan by understanding the required sediment grain size for a river.
