黄茅海围垦工程潮流泥沙变化数值模拟

Numerical modeling of tidal current and sediment for reclamation project in Huangmaohai Sea

简述了黄茅海海域平面二维潮流泥沙数学模型的基本方程、基本问题的处理、初边界条件和网格划分。应用1992年7月16-17日中水大潮和1992年11月16-17日枯水中潮2个水文组合对模型进行了验证。在中水大潮情况下,着重对选定的治导线围垦工程方案E1W2进行了工程前后潮流泥沙动力条件变化模拟计算分析,结果表明:围垦工程实施后,对海区尤其是口门内河道沿程不会产生防洪压力,对崖门水道和虎跳门水道排涝的影响不大,围垦工程不会引起水流动力轴线的明显变化,对围堤和口门内河岸的稳定不会构成威胁。

A 2D numerical model of tidal current and sediment is introduced briefly in this paper.The initial-boundary conditions and calculation grid are presented,and the key techniques of the model have been processed.The model has been verified using measured data of spring and medium tides in 1992.The results are satisfying.The model is used to calculate the changes of tidal current and sediment before and after reclamation scheme（E1W2） in Huangmaohai Sea.The results show that the flood-control stress produced by the reclamation project is low in the area,especially along the Yamen waterway,and the influence of the reclamation project on the waterlogging in Yamen and Hutiaomen waterways is trivial.The results also indicate that the tidal current dynamic axis will not be changed significantly by the reclamation project and the stability of the river bank and dyke is still reliable.