河口、海湾平面潮流数值计算中的几个问题

Some Problems in The Numerical Computation of 2-D Tidal Flow in Estuaries and Bays

笔者近年来在从事河口、海湾潮流数值计算的工作实践中,时常碰到一些问题,如床面糙度n值的分布情况;模型动边界与水量平衡的影响关系;开边界条件缺损如何补救;嵌套模型内边界控制信息能否保证平滑传递等,往往不能从数学模型所依托的基本方程及其计算格式中寻求解答,而需要针对不同问题的具体性质,采用既满足物理图案,又便于实际操作的措施予以克服和解决。 本文通过在珠江口磨刀门、伶仃洋和黄茅海等河口湾以及粤西水东湾(比较典型的砂坝泻湖潮汐通道)所进行的平面二维潮流计算实例,对上述几个问题的提出及其处理过程,作一简略介绍,借以抛砖引玉,促进工程潮流数值计算向实用方向的发展更趋完善。

In the practice of numerical computation of tidal flow in estuaries and bays, some problems are often encountered, such as the distribution of river bed roughness; the effect relationship between model moving boundary and the balance of water volume; the remedy of the shortage of open boundary conditions; whether the boundary control data on scarf joint model can be smoothly transmittde? usually these problems can not be solved by basic equations or by the computational for- mat, but can only be overcome by the measures which are both satisfying physical figures and also being convenient for practical operation according to the actual natures of differeent problems.This paper, on the basis of the computational examples of the estuarine bays of Modaomen, Lingdingyang and Huang-maohai of the Pearl River Estuary as well as Shuidongwan in West Guangdong province (typical tidal channel on lagoon-sandbar) , briefly introduces nature of the problems and means of processing for the purpose of promoting the numerical computation to be more practical and with better results.