気候変動と堆砂進行がダムの利水機能に及ぼす影響に関する検討

抄録

After releasing MLIT vision for dam upgrading under operation, it is required to evaluate climate change impacts on flood control and water use functions of dams. For long term reservoir sustainability, reservoir sedimentation has also the key effects almost equivalent to climate change impacts. Up to now, however, since there is no suitable evaluation method to clarify those impacts, it is important to establish appropriate screening criteria in order to select high priority existing dams for upgrading. In this study, we firstly predicted changes in flow regime curves and sedimentation progress under changing climate for two target dams. Secondly, we calculated the change of water use functions of dams in the future. Based on these results, we proposed simple criteria to associate climate change impacts with change of water use functions of dams.