波浪作用产生沙波的动力机制研究

界面波作用产生的周期沙波现象的动力机制一直没有得到合理圆满的解释。本文针对这种现象通过对浅水弱非线性Boussinesq方程，讨论界面波由于反射效应产生的反射波与入射波的非线性相互作用，得出了一个不受时间变量制约的不传播非线性二阶驻波解。从这个驻波解空间分布上可以看出，这种动力机制作用产生的周期沙波通常是其波形平行于反射壁，并且沙波波长为入射波垂直反射壁面分量的一半。数值模拟结果证明这个非线性二阶波是Genus-2波列的一个子集．水槽实验和海岸高空照片资料上清楚的分辨出这种由反射壁效应产生的沙波的客观存在性。

Dynamic mechanism of sandwave phenomena induced by wave effect

The dynamic mechanism of wave induced sandwave phenomena has so for not been explained satisfactorily. In this paper, a standing wave solution has been made by nonlinear interaction of reflection wave and incident wave, thus producing a second order wave solution with Boussinesq equation. From the space distribution of the standing wave solution, one can know that the sandwave induced by the dynamic mechanism usually has its wave shape parallel to the reflection wall and that the sandwave length is a half of the incident wave length vertical to the wall.The simulation results demonstrate that the nonlinear second order wave is a subset of Genus 2 wave arrangement.From flume experiments and aeroplane photographs of the coast, one can see the existence of sand wave induced by the reflection wall.