考虑橡胶坝影响的水动力学模型

Hydrodynamic model with consideration of rubber dam effects

为提高含堰坝河段水动力模拟精度,建立考虑橡胶坝复杂调度条件的水动力学模型。基于Preissmann四点隐式差分格式离散方法,构建橡胶坝数值模拟计算流程并进行逻辑判断,采用替代法思想处理含有橡胶坝的河道,求解一维河道水动力学离散方程组。用淠河流域下游六安城区河道橡胶坝的实际洪水过程对模型进行验证,针对近年来淠河流域发生的典型洪水过程,分别对橡胶坝塌坝与不塌坝两种不同工况进行数值模拟。结果表明:考虑橡胶坝塌坝模拟的计算结果可以较好地拟合淠河流域的实测数据,模型可以有效模拟橡胶坝调度影响下的洪水演进过程,提高洪水期间的模拟精度。

To improve the hydrodynamic simulation accuracy of river sections with weirs,a hydrodynamic model considering the complex operation of rubber dams was established.Based on Preissmann four-point finite difference implicit scheme discretization method,a rubber dam numerical simulation calculation process was constructed to make logical judgments,and the substitution method was used to handle the river channel containing rubber dams.One-dimensional hydrodynamic discretized equations of the river channel were then solved.The model was verified using the actual flood process of the rubber dam in the Pihe River Basin,and two different working conditions of dam collapsing and non-dam collapsing were simulated in view of a typical flood process in the Pihe River Basin in recent years.The results show that considering the rubber dam collapsing simulation,the measured data of the Pihe River Basin can be better fitted.The model can effectively simulate the flood evolution process under the influence of rubber dam scheduling and the simulation accuracy during the flood period can be improved.