规则波作用下沙质岸滩剖面演变研究*

为了探究规则波作用下沙质岸滩的形态变化，在波浪水槽中构建沙质岸滩剖面的演变过程。发现在规则波作用下，沙质岸滩会出现沙坝峰，存在从单一沙坝峰到双沙坝峰的演变过程，且沙坝形成后并非静止不动，而是随时间变化存在离岸和向岸的往复运动。探究水深、周期和植被覆盖对沙质岸滩变化的影响，对其最大冲刷深度、最大淤积深度、冲刷面积和淤积面积进行讨论分析。结果显示，水深的增大会导致沙坝向岸运动，周期的增大会导致岸滩趋于紊乱，植被覆盖对岸滩有稳定作用。

Study on evolution of sandy beach profile under regular wave action

In order to explore the morphological changes of sandy shoals under the action of regular waves,we construct the evolution process of sandy shorelines section in the wave flume.It is found that under the action of regular waves,sand shoals will have sand bar peaks,and there is an evolution process from single sand bar peak to double sand bar peak.Moreover,after formation of sand bars,they are not static,but reciprocate offshore and onshore with time.We also explore the influences of water depth,period and vegetation coverage rate on the variation of sandy shoals,and discuss and analyze the maximum scour depth,maximum siltation depth,scour area and siltation area.The results show that the increase of water depth will lead to the movement of sand dam towards the shore,the increase of the period will lead to the disorder of the shoreline,and the vegetation cover has a stabilizing effect on the shoreline.