Study and Application on Flow-Sediment Mathematical Model of Dongzhuang Reservoir Area in Jinghe River

摘要

Hyperconcentrated flows have a significant influence on sediment carrying capacity and settling velocity of sediment particles,which leads to the sediment transport problem being more complex than common sediment-laden flows.Taking the influences above into account,packet sediment carrying capacity formula reflecting different states of riverbed erosion and deposition is established,and a mathematical model of reservoir sediment scour and deposition for silt calculation of hyperconcentrated flows is developed by applying correction method for settling velocity proposed by Zhang Hongwu to revising free settling velocity of a sediment particle and utilizing corresponding saturation recovery coefficient for different particle size based on the condition of erosion and deposition.The mathematical model is verified with measured data of Xiaolangdi Reservoir on the Yellow River and Bajiazui Reservoir on the Puhe River,the calculation of the reservoir siltation and deposition features agree well with measured data,and the process of sediment scour and deposition on the high sediment-laden river with reservoirs built is also well reflected.The mathematical model is adopted on the Dongzhuang Reservoir scheduling of water and sediment regulation for the calculation of reservoir sediment scour and deposition with using data of three series of flow and sediment.The results provide essential technical support for Jinghe river basin planning and reservoir planning and design.