Numerical Simulation and Analysis of Different Side Vertical Seam Fishway in a Project

The different side vertical seam fishway has the characteristics of better adapting to the change of water level, obvious energy dissipation effect and good flow pattern. Through the method of numerical simulation, taking the bottom slope ratio of fishway and the length width ratio of pond chamber as variables, this paper explores the influence of the structural change of pond chamber on the hydraulic characteristics of different side vertical seam fishway, which plays a reference role for the design of related fishway projects. The results are as follows. After the length width ratio of the chamber is determined, the change of the bottom slope ratio does not affect the plane shape of the mainstream area, the location distribution of the maximum velocity in the mainstream area along the way and the area size distribution of the reflux area, but when the bottom slope ratio is determined, the change of the length width ratio of the chamber has a great impact on the hydraulic characteristics of the chamber. The ratio of each bottom slope to the length width of each cell. Due to the influence of jet action at the vertical j oint, the value of the maximum velocity in the main flow area along the way is changing within a certain range from the position of the vertical joint, but the position of the maximum velocity does not change. When L/B=1.00, i=1∶70,1∶80 and 1∶90, the attenuation rate of the maximum velocity along the way in the pool chamber reaches the maximum, and the maximum velocity in the pool chamber is less than the design velocity. The plane shape of the main flow area between the partitions of the adjacent two stages of the pool chamber is small, the area difference between the two sides of the reflux area is small, and there is no wall attached flow in the main flow area of the pool chamber. Therefore, L/B=1.00, i=1∶70,1∶80 and 1∶90 can be selected as the design parameters of the fishway in the study area.