PROPOSAL OF CRITERIA TO EVALUATE CLIMATE CHANGE AND RESERVOIR SEDIMENTATION IMPACTS ON FLOOD CONTROL AND WATER UTILIZATION FUNCTIONS OF DAMS

Abstract

 It is required to evaluate climate change impacts on flood control and water utilization functions of dams after releasing ‘MLIT vision for dam upgrading under operation’. Furthermore, in the evaluation of the long-term dam function, the decrease of effective storage capacity by sedimentation progress is also an important factor. Up to now, however, there is no suitable evaluation methods to integrate these factors. In this research, we firstly predicted changes in flow regime curves and reservoir sedimentation under climate change impact. Secondly, several criteria have been proposed to select high priority existing dams for upgrading. Thirdly, we evaluated the appropriateness of the criteria for water utilization functions by examination at individual dams. Based on these evaluation criteria, we found that it is necessary to mitigate climate change impacts in order to maintain necessary functions at almost all dams.