太湖湖流对波浪的影响机制研究

根据基于动谱平衡方程的SWAN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了动态模拟,并研究了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。

Study on the influence mechanism about current to wave in Lake Taihu

On the basis of measured data about wave and current in Lake Taihu,the calibrated wave model which is described by the third-generation spectral action balance equation and three-dimensional current model were obtained.After that,the wave and current in Lake Taihu were simulated respectively,and then the influence mechanism about current to wave was made a careful study.The results showed that the SWAN wave model and current model can be well described the process of growth and propagation with wave and current in Lake Taihu;flow field has a great influence on wave field,and the influence became more apparent with the increment of wind speed.Furthermore,wind direction and also has taken effect on that influence.The detailed influence were described that when current and wave have the same direction,such wave parameters will be enlarged as the significant wave height,wave speed,wave length,etc,and vice versa.