尾闾河段的数值模拟研究

尾闾河段是否畅通，直接关系到河流能否安全泄洪、排沥，是水利部门十分关注的问题。本文阐述了采用一、二维耦合数学模型进行尾闾河段洪水与潮波的模拟的基本理论，对耦合模型的交界面条件及耦合方式进行了详细说明，并以某河尾闾段为例建立一、二维耦合模型。一维数学模型研究计算的范围为河口区上游的河段，平面二维数学模型研究计算的范围为近挡潮闸河段以及至河口外近海区域。模型以历史洪水和实测潮波分别进行了验证，计算结果与观测结果吻合良好，表明耦合模型可以较好地反映模拟河段及近海区的洪水与潮汐特性，解决河流尾闾段的水力模拟计算。

Study on numerical simulation of river sink

A coupled model composed of 1-D and 2-D model for simulation of flood and tide current in river sink area is developed. The basic theory for establishment of the model is presented. Interface conditions and the coupling modes are discussed in detailed. The 1-D model is applied to calculate the upstream section of the river mouth area, while the 2-D model is used for the calculation of the area including the tide lock and estuary. The validity of the model is verified by using the historical recorded flood and measured tide. The calculated results are in good agreement with the observation data.