土砂管理の軽減を目的とした治水利水分離型ダム事業のライフサイクルコストに関する研究

抄録

In Japan, many multipurpose dams have been constructed. A multipurpose dam attains flood control and storage for water use functions on a single dam site. However, multipurpose reservoirs should be dammed up all the time and inflow sediments during flood periods also easily deposit in the reservoirs. From this point of view, constructing only a flood control dam which has gateless bottom outlets at the original river bed level in the main stream is under planning to reduce necessary sedimentation management for a long period. If water storage function is necessary, e.g. multipurpose project, additional water storage dam for water use out of river channel or on the tributary, e.g. off-stream reservoir, with a conveyance facility can be constructed almost without sedimentation management.

In this paper, we study on the life cycle cost of dam projects that have flood control and storage for water use functions separately, and have presented conditions such that these projects can be applicable in Japan.