階段型魚道を組み込んだ砂防ダムに関する研究
1994 年 47 巻 4 号 p. 39-43
詳細
1994 年 47 巻 4 号 p. 39-43
Fish ladders for low drop structures; groundsels have been relatively successful. Those for sabo dams are not as easy to construct because of their height. It is impossible to prepare fish ladders that work not only after sedimentation but also before dams become filled with sediment. A new idea for sabo dams with fish ladders is proposed, in which the ladders work both before and after sedimentation of the sabo dams. The key is the availability of fish ladders with steep gradients. The flow in fish ladders was examined through hydraulic test models with and without feeding sediment. The idea looks promising though it has not yet to be examined with real fish in the field.
