基于抛物型缓坡方程模拟近岸植被区波浪传播

Modeling coastal water wave propagation in vegetation field based on parabolic mild slope equation

植被对波浪传播运动有重要影响。考虑近岸波浪在植被区传播中的折射、绕射、破碎及植被引起的波能耗损效应,基于抛物型缓坡方程建立了模拟近岸植被区波浪传播的数学模型,对模型进行了数值模拟验证,采用数值模拟试验分析了植被对波浪传播的影响。数值模拟结果表明,波浪在近岸植被区传播时,随着植被密度和植被高度的增加,波浪传播中的波高衰减增大,波能耗损增加;不同周期波浪在植被区传播中的波高衰减过程也明显不同。

The vegetation has important impact on the propagation of water waves.The model for coastal water wave propagation in vegetation field was built based on the parabolic mild slope equation,in which the refraction,diffraction and wave energy dissipation due to wave breaking and vegetation effect were considered.The model was validated,and the vegetation impacts on water wave propagation were also analyzed by the model.It was shown by numerical results that the vegetation has important impacts on coastal water wave propagation,and the wave height attenuated with the increase of plant density,as well as plant height,and the water wave energy dissipation due to vegetation was also related to wave period.