水流中波浪绕射折射数值计算与分析

Numerical computation and analysis of wave diffraction refraction in water with varying current and topography

提出了水深与流场缓变水域波浪传播数学模型——水流中依赖时间变量并考虑能耗的波浪“缓坡方程”及其等价的控制方程组 ,分析比较了无水流情况此理论模型与其相应的两种抛物线型的差别 ,同时讨论了水流对波浪计算结果的影响。部分计算实例表明 :该模型较其他模型能更好地适应河口三角洲大范围水域的波浪传播变形数值计算 ,且在强流河口和近岸地区必须考虑水流对波浪影响 ,否则计算结果将严重失真。

WT5”BZ]A numberical model for wave diffraction refraction in water with varying current and topography is proposed. And a time dependent wave mild slope equation with a dissipation term and correspond equivalent governing equations are presented. Two differnent expressions of parabolic approximations in the absence of current are also given and analyzed. The influence of current on the results of simulation of waves is disucssed. Some examples show that the present model is better than others in simulating wave transformaion in large water areas. And they also show that the influence of current should be taken into account in the numerical computation of wave propagation with strong current in estuaries and coastal areas, otherwise the modeling results will be largely distorted.