中文摘要：

基于Saint—Venant方程组，建立了南方河网区引排水数学模型，运用Preissmann四点加权隐式有限差分格式对方程组进行时间和空间离散，采用双松弛迭代法求解河网非恒定流。重点分析了淹没条件下河网水闸边界的处理方法。以苏州古城区为例，利用原型观测资料率定数学模型，并采用率定后的模型模拟多个闸泵运行工况下的河网水流运动。结果表明，建立的模型具有较高的精度，能方便快速地模拟含有较多水闸、泵站的河网非恒定流动。

英文摘要：

According to Saint-Venant equations and Preissmann implicit finite difference format, water transfer mathematical model of river networks in the southern of China was established to simulate the wa- ter transfer process in old urban river networks of Suzhou city. A double relaxation iteration method was used to simulate the unsteady flow in river networks. Calculation methods of sluice discharge were dis- cussed in the river networks with many sluices. The mathematical model was calibrated by filed experi- mental data in order to simulate the water transfer process. The simulation results showed that the model had rapid calculation speed and high calculation accuracy and could simulate the transient flow characteris tics in river networks with many sluices and pumping stations.