Numerical simulation study for the operation procedure and flow and sediment transport in the Sanmenxia Reservoir
To reduce the error caused by overly simplified water and sediment calculation and their one-way coupling to the pool level calculation in most reservoir models,a water and sediment regulation model for reservoirs is established based on the finite volume method with shock-capturing capability and the river network algorithm.A quasi 2D algorithm solving the mass and momentum conservation equations for water and sediment phases is adopted injunction cells,which can take account of the influence of junction angle,and can be implemented with OpenMP to conduct parallel computation.In the reservoir operation module of the proposed model,an operation scheme is represented by a rule list,in which each rule is composed of a sufficient condition with five parameters and an operation command with four parameters.A flow and sediment transport model provides hydrological data at the monitoring location and stage-volume relationship that is updated in real time for the reservoir operation module,and the operation module provides downstream boundary conditions for the flow and sediment transport model,by which way the two-way coupling is achieved.The model is verified with field measured data in the Sanmenxia Reservoir in 2020,with the water level,discharge and sediment concentration in three reaches of the reservoir area being well predicted.During the sediment discharging period when the fastest dropping rate of pool level reaches 2.3 m/h,the numerical scheme keeps stable and succeed to predict the sediment concentration peak out of the reservoir.The model is then applied to investigate the trend of the Tongguan elevation.By simulating different operation schemes in flood and non-flood seasons,the period when the pool level has the most significant impact on the reservoir sedimentation process and the Tongguan elevation is preliminary identified,which can help to further improve the operation scheme for the Sanmenxia Reservoir.
reservoir operationnumerical simulationSanmenxia ReservoirTongguan elevationscour and deposition
万方数据
维普
