重庆两江汇流水动力模型

The hydrodynamic numerical model of the confluence of Yangtze River and Jialing River in Chongqing

本文分析了长江、嘉陵江汇流的来流条件和河道自身地形特点,以EFDC水动力模型为基础,建立了重庆两江汇流水动力模型。该模型利用坐标变换技术,平面采用正交贴体网格,垂向采用Sigma坐标,利用干湿点法描述河道干湿地的变化．并对比实测资料校核模型参数。对于汇流比对流场影响和滨江路对流场影响等的模拟结果,表明该模型可用于模拟和分析天然河流水动力场的分布以及变化结果,对于预测洪水、城市建设、航道管理等有重要意义。

A two river confluence model is developed that describes the flow field and confluence characteristic of Yangtze river in Chongqing. Based on the EFDC, the hydrodynamic model of two river confluence is developed that the curvilinear and orthogonal coordination is used in the horizontal direction, and sigma coordination is introduced in the vertical direction. Compared with the measured data, the parameters are calibrated and verified. The phenomena of the confluence ratio, wetting and drying and the effect flood-control-projects are simulated using this model. The results show that this model is a useful tool for forecasting flood, studying the effect of the city building and managing the waterway.