基于SWAN-VEG的植被消浪护岸模拟研究

针对第三代波浪模型SWAN中新近开发的SWAN-VEG模块,对该模型中植被消浪特性的参数进行了数值水槽的模拟分析,并将其模拟结果与原有试验数据及模型试验结果进行相关性分析。结果表明,通过考虑植被高度系数影响因子α来改进SWAN-VEG中阻力系数的估算方法,得到了较好的拟合效果。而由于对于柔性植被的结构及植物晃动特性,消浪过程比较复杂,SWAN-VEG对于偏刚性材质的植被场模拟效果要明显好于柔性植被。通过对试验数据的统计分析得到,柔性植被验证较差的原因是阻力系数随植被晃动效果的强弱有明显的变化。

Research on the modeling of the wave attenuation due to vegetation based on SWAN-VEG

By the new developed SWAN-VEG of the third-generation wave model SWAN, a study of modeling that wave damped by vegetation is analyzed with the present experimental data in the numerical wave tank, in addition, an experiment is made with the artificial flexible vegetation to verify the computed results. And the results show that we get a good fit by improving the calculation of CD when the height factor of vegetation is taken care of. For the swaying of the flexible vegetation, the attenuation of wave in flexible vegetation is much more complicated, the validation is much worse than the rigid one. Through the statistics of the experimental data we find that, the drag coefficient CD varies with different extents of swaying in flexible vegetation, and that is the reason why it does not validate well.