Study on hydraulic characteristics and optimization of the combined weir and hole baffle fishway rest pool

According to the fish passage requirements of Cao’e River lock, a three-dimensional turbulent flow model of the fish passage with weir-hole combination bulkhead chamber was established, and the effects of lengthening the resting pool length and adjusting the bulkhead distribution on the resting pool were analyzed in terms of the flow pattern of the chamber, turbulent kinetic energy and the attenuation of the mainstream along the course. The results of the study show that: the three working conditions all have obvious mainstream against the wall phenomenon, two times the length of the fishway resting pool can basically meet the hydraulic requirements of fish on the resting pool, to three times the length of the pool, the resting pool reflux area increases insignificantly; for the straight section of the resting pool chamber, the heterolateral distribution than the same side of the distribution can produce more favorable flow patterns; resting pool length and the same side of the bulkhead heterolateral distribution on the resting pool turbulent kinetic energy effect is small.