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合理的水沙数值模式可为水流运动、河床演变的分析提供依据。基于通用河网二维水流的计算模式,将流域二维河网划分为单一河道、树状河道、环状河道和十字形河道等河网二维基本计算单元,采用二维浅水方程和悬移质输沙基本理论建立节点水位和悬沙控制方程,通过不规则稀疏矩阵的求解获得所有节点上的水位、流速及含沙量,实现全流域的二维水沙耦合计算。通过长江下游澄通河段的验证,在汊道处的计算能很好地体现流场间的相互作用,该模型能满足精度要求。
The reasonable numerical model of water and sediment can provide basis for the analysis of water flow and river bed evolution. Based on the calculation model of two-dimensional flow in the common river network, the two-dimensional river network in the river basin is divided into two-dimensional basic calculation units of river networks such as single river channel, dendritic river channel, circular river channel and cruciform river channel. Two- Based on the basic theory of sediment transport, the water level and suspended sediment control equations of nodes are established. The water level, flow velocity and sediment concentration of all nodes are obtained by solving irregular sparse matrix. Through the verification of the Chengtong reach of the lower reaches of the Yangtze River, the calculation at the Tao Road can well reflect the interaction between the flow fields, and the model can meet the accuracy requirements.