航道整治工程泥沙数学模型的构造及计算方法

Structure and Calculating Method of Sediment Mathematical Model for Waterway Regulation Engineering

建立了正交曲线坐标系下二维紊流全沙数学模型，水流模型采用紊动动能和紊动耗散率闭合雷诺方程，把悬移质输沙概化为单纯淤积、单纯冲刷和淤粗冲细三种情况，依据悬沙与床沙交换机理建立了挟沙能力和非均匀沙分组挟沙能力的表达式．在水流输运及分组含沙量输运方程的离散过程中，采用守衡性较好的控制体积法和SIMPLEC计算程式，以提高计算稳定性和加快收敛．本模型对复杂条件的河床适应性较强，为平面二维长河段的河床变形计算进一步创造了条件．

A two dimensional turbulence and total sediment mathematical model is developed with theboundary-fitted coordinates in this paper. The states of sediment transport are distinguished into three types:sole deposition, sole erosion and deposition of the rough and erosion of the fine. The different formulas ofcarrying capacity of non-uniform suspended load transport are established at the same time. The finite volumemethod and SIMPLEC-algorithms is adopted, and it improves the convergence and stability of compution. Themodel can solve problems of flow and sediment in long rivers and complicated boundaries.