含泄水建筑物的复杂缓流河网水动力数值模拟

Numerical simulation of complex subcritical flows in channel networks with structures

由于存在回水效应,复杂缓流河网的水动力数值模拟一直是个难题,河网中常存在各种建筑物,这也增加了河网模拟的难度。本文应用JPWSPC(汊点水位预测校正)法来统一处理汊点以及河网中建筑物的连接条件,通过水位预测和校正,使各河道离散方程组封闭并保持系数矩阵的带状特征,物理上相互联系的各河道被数值解耦,同时利用特征线理论使各河道间的连接条件得到满足,文中采用典型的算例对方法进行了验证,计算结果表明JPWSPC方法可以很好地应用于含建筑物的复杂缓流河网水动力模拟。

Due to backwater effects, it has long been a challenging problem to numerically simulate complex subcritical flows in channel networks. The often existing structures in networks make the problem more difficult. In this paper the junction-point water stage prediction and correction （JPWSPC） method is utilized to treat both the connecting conditions at the junctions and structures, and the physically interconnected reaches are numerically decoupled. The algorithm is verified using a benchmark example and the results demonstrate it is capable of modelling complex suberitical flows in channel networks with structures.