河道及河口一维及二维嵌套泥沙数学模型

1-D and 2-D nesting sediment transport model for rivers and estuaries

建立了一种河道及河口一、二维嵌套的泥沙数学模型 ,对基本的控制方程、方程的离散和求解方法、嵌套连接条件以及非均匀沙的处理等问题进行了研究 .以非恒定非均匀不平衡输沙理论作为本文建模的基础 ,为方便处理二维计算域的不规则边界 ,采用有限元数值离散格式 .验证算例对河道做一维简化 ,对口外海域做二维处理 ,通过交界面的水位、流量和含沙量等的传递 ,在每一迭代步内进行耦合计算 .数值模拟结果与实测资料吻合较好 ,且计算省时 ,表明本文建立的嵌套模型是一种解决某些实际工程问题的可靠的和高效的工具 .

A 1\|D and 2\|D combined sediment transport model for rivers and estuaries is presented.The basic equation,the numerical method,the coupling conditions and the treatments for non\|uniform sediment are studied.The model is based on unsteady non\|uniform and non\|equilibrium sediment transport theory.The finite element method is abopted to solve the governing equations for its capability of accepting complex geometry.The model is verified by the simulations of the flow and sediment transport in the estuaries of the Zhangweixin River,in which the river area is treated as 1\|D and the sea area is treated as 2\|D.By transferring the water level,discharge and sediment concentration at the interface,the coupling calculations are conducted in each iterative step.The results are in good agreement with the measured data and a lot of CPU time is saved,which shows that the proposed model is reliable and high efficiency in solving practical engineering problems.