To address the problem of sediment accumulation in the intake area of the river intake and to explore the effectiveness of different sediment trapping structures,a three-dimensional mathematical model for flow and sediment transport are established in the intake area of the Jinping Second-Level Hydropower Station in the Yalong River.The model is based on the RNG k-ε turbulence model and the mass particle model.The simulation results are in good agreement with field measurements.The study simulates the flow and sediment transport processes in the intake area after the installation of a single sediment deflecting sill and a combined sediment deflecting sill.The results indicate that the addition of a single sediment deflecting sill in front of the intake can alter the flow direction at the bottom layer of the river,but its effectiveness in sediment control is limited.On the other hand,the installation of a combined sediment deflecting sill redirects most of the flow downstream at the riverbed,eliminates the vertical-axis recirculation of the middle and surface layers,and significantly increases the flow width entering the intake.The combined sediment deflecting sill can generate a continuous and strong helical flow,effectively preventing sediment particles from reaching the intake and introducing clear water from the upper layer,thus achieving desirable sediment control and water intake effects.The findings of this study can provide valuable insights for the design of river intake projects.
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