Characteristics of Water and Sediment Movement in the Intake of Diversion Type Hydropower Station
To investigate the water and sediment movement characteristics at the intake of the diversion type hydropower station,the physical modelling experiment was conducted taking a large-scale diversion type hydropower station as an example.The velocity distributions in the longitudinal section and the sediment erosion and deposition distribution in riverbed were analyzed,and the velocity distributions in the entrance section under different operating conditions were compared emphatically.The results indicated that when the inflow rate was low,the lateral velocity distribution in the river channel was relatively uniform,and the longitudinal velocity of the longitudinal section decreased faster as it was farther from the intake.Whereas,the opposite trend was observed at higher inflow rates.Additionally,the smaller inflow rates,the more uniform and similar distributions of flow velocities across the entrance sections,and the lower water levels,the closer to the downstream of the peak flow velocity of the entrance sections.The position of sediment deposition in front of the sand barrier was consistent with the position of peak flow velocity at the entrance section,and the sediment crossing the barrier would be carried by the flow to the side platform upstream of the intake.In practical engineering,the topography of the river channel would have a significant impact on the water and sediment movement process in the intake area.The research results can provide a reference for the planning and design similar engineering.
diversion type hydropower stationwater intakecharacteristics of water and sediment movementphysical modelling experiment
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