Model Test And Numerical Simulation Research On Hydraulic Characteristics Of Fish Passing Facility In Gujun Reservoir

The sluice and dam buildings block the way for fish to go back to spawning.The fishway project provides an important channel for the reproduction,migration and migration of ecological fish.Among them,the vertical slit fishway is a fishway style widely used at home and abroad,and the fishway layout is reasonable.Sex affects the actual fishing effect.Aiming at the planned vertical slot fishway of Gujun Reservoir,this paper establishes a three-dimensional model for multiple parts of the proposed fishway plan through numerical simulation and analyzes the flow pattern of the water,and optimizes the parts that are not conducive to fish migration to improve the fishway.The ability to pass the fish is then verified by a local fishway model test based on the optimized fishway model.The main research results are as follows:(1)The flow pattern of the fish passage in the numerical simulation and the model experiment is similar.The main flow is in the middle part of the tank,and the flow velocity of the main flow decreases along the way.There are backflow zones of equal size and opposite rotation directions on the left and right sides.The area of the zone occupies 80%of the area of the pool room,and the flow velocity in the center of the reflux zone is close to 0 and shows an increasing trend to the surroundings.(2)According to the local model test,the measured discharge coefficient range of vertical joints is 0.632?0.689,and the average discharge coefficient is 0.66,which is basically consistent with the discharge coefficient 0.68 determined by numerical simulation,indicating that the deduced vertical slit fishway flow formula is suitable for fishway design.(3)The flow rate of the fishway outlet is 0.226m3/s when the water depth is 1m,the flow rate is 0.450m3/s when the water depth is 2m,the velocity range of the vertical slit is 0.5m/s?1.1m/s,and the velocity range of the pool chamber is 0.1m/s?0.3 m/s,the water level on the upstream and downstream of the fishway baffle,and the vertical seam velocity distribution all show that the design and simulation are in good agreement.(4)The flow rate of the fishway outlet is 0.226m3s when the water depth is 1m,the flow rate is 0.450m3/s when the water depth is 2m,the velocity range of the vertical slit is 0.5m/s?1.1m/s,and the velocity range of the pool chamber is 0.1m/s?0.3 m/s,the water level on the upstream and downstream of the fishway baffle,and the vertical seam velocity distribution all show that the design and simulation are in good agreement.(5)Observing the prototype of the fishway and model experiments,it was found that the water flow in the vertical slotted fishway was in a non-uniform stepped water surface flow pattern,and the water surface in the pool was horizontal.The water surface line was extracted through numerical simulation and the water level before and after the long partition measured by the experiment Basically agree.