一二维联解潮流数学模型在防洪评价中的应用

Application of combined solution of one-dimensional model and two-dimensional tidal current mathematical model in flood control evaluation

针对单纯使用一维或二维数学模型难以准确高效模拟大型涉水工程对水域影响的问题,通过利用一、二维联解潮流数学模型,在珠江口某港区码头工程附近使用二维模型,对该区域流场和流速变化范围进行模拟,其余水域采用一维模型模拟。结果表明,工程对珠江东四口门及工程周边水域水位、流速、河道潮量及分流比、潮排、潮灌、排涝等影响不大。结论认为,一、二维数学模型联解计算可以用于大型工程,尤其是海域内大型工程的防洪评价计算,并能够得出较为可靠的计算结果。

The influence of large - scale project to the river can not be simulated by using one - dimensional model or two - di- mensional model alone, so through the combined use of one - dimensional tidal current mathematical model and two - dimensional model, the area near the project is simulated using two - dimensional model to obtain the velocity field and velocity variation range; the rest area is simulated by one -dimensional tidal current mathematical model. The results show that the project influ- ence on water level, velocity, tidal current in the river channel and diversion ratio, discharge, intrusion and drainage in the neighboring area and entrance of Dongsikou are small. It is concluded that the combined solution of one - dimensional tidal cur- rent mathematical model and two -dimensional model can be used in large projects, especially the flood control evaluation calcu- lation of large projects in waters.