Study on the Influence of Waterproof Curtain Wall on Discharged Water Temperature in Sananxi Hydropower Station

Abstract In order to solve the problem of low discharged water temperature of the hydropower station, the engineering of waterproof curtain for low-temperature water treatment has been built in Sanbanxi power station.The low-temperature waterproof curtain is adapted to the variation of 50m water level. The operating conditions are quite different, and the force of each structure is complex, which is characterized by the coupling of solid structure and fluid flow field, the geometric nonlinear and large structural displacement of the soft structure system such as waterproof curtain and cable.The waterproof curtain accelerates the mixing of different water temperature layers through the surface water, and finally changes the water temperature structure in front of the dam to achieve the purpose of increasing the discharge water temperature. The implementation of the temperature control curtain changes the water intake elevation of the power station, making the thermocline height of the reservoir area change with the change of the top elevation of the waterproof curtain. According to the monitoring data throughout the year, the thermocline formed in the reservoir area after the implementation of the waterproof curtain is higher than that before the implementation, and the mainstream flow rate of the reservoir area in spring increases significantly compared with that before the implementation of the waterproof curtain, which can accelerate the water body at the end of the reservoir to reach the dam and improve the discharge water temperature. The application of water-proof curtain effectively guarantees the reproduction and growth of downstream aquatic organisms, which is of great significance to protect the downstream aquatic ecological environment of the reservoir.The research findings have high reference value for improving the adverse effects of low-temperature water on the reproduction and growth of aquatic organisms in hydropower station.