太湖波浪过程的数值模拟

基于动谱平衡方程的SWAN波浪模型和湖流三维模型,分别对太湖波浪和湖流的生消过程进行动态模拟,并研究太湖湖流对波浪的影响.结果表明,湖流模型和SWAN波浪模型可以较好地模拟风作用下太湖湖流和波浪的生成和传播过程;太湖流场对波浪场具有一定影响;风速越大,影响越显著,同时也受风向影响;沿岸区波浪受湖流影响更加显著;湖流对波浪的影响基本上呈现湖流波浪同向时,有效波高增大,波速增大,波长增长;反向时有效波高减小,波速减小,波长缩短的特征.

Numerical simulation of wave process in Taihu Lake

Based on SWAN model and three-dimensional current model,the wave and current in Taihu Lake are simulated and the influence of current on wave is studied.The results show that the SWAN model can simulate the processes of growth and propagation of the wave and current under the wind action.The flow field has a great influence on wave field and the influence becomes more significant with the increase of wind speed.Furthermore,wind direction also has effect on wave field.The influence of current on wave is more significant in coastal area.The detailed influences are described as that when current and wave have the same direction,such wave parameters as the significant wave height,wave speed,wave length,etc,will be enlarged and vice versa.