抄録
Slope type fishways are more suitable for various species than classic types : “pool fish ladders”. However, in many cases, they need discharge control to maintain fish passage conditions. In this situation, experiments related to fish behavior with various “discharges” and “pool lengths” have been scrutinized to extract the basic information. Following the former study, the desirable minimum flow depth for swimming and critical flow velocity are studied. Finally, the critical relationship for the swimming behavior between flow depth and velocity was obtained, and it was also found that the enough pool existence along slope type stream is needed.
With these results, hydraulic conditions in sample slope type fishways are investigated in situ by mean of velocity, water depth, turbulent intensity “It”, and pool length. A sample fishway with concrete blocks doesn't have suitable hydraulic conditions for the passage of fish, but the turbulence intensity was found below the natural habitat conditions.
