人工沙滩在堤后次生波作用下的稳定性试验

Stability experiment under secondary wave over breakwater of artificial beach

基于波浪泥沙物理模型,考虑不同水位条件、不同重现期的波浪作用以及复坡和单坡2种不同坡度的沙滩坡面,对斯里兰卡科伦坡港口人工沙滩的冲淤情况及稳定性进行试验研究。结果表明,在次生波作用下,沙滩出现了不同程度的冲刷,沙滩剖面出现冲刷的主要部位一般位于水面线以下的波浪破碎带内,但当波浪条件增大时,人工沙滩剖面在水面线以上也呈普遍冲刷状态。在试验工况范围内,外海水位越高,波高、周期越大,防波堤堤后的次生波越大,所造成的沙滩剖面变形越大,冲刷深度越大。复坡和单坡2种不同坡度方案滩面泥沙在次生波作用下的冲淤部位基本相似,剖面稳定性相当。

Based on the wave physical model research of sediments,we analyze scour and silt,and the stability of artificial beach for Port City Project,Colombo,Sri Lanka under two cross-sectional beaches of different slopes in the wave,different water level and return period.The results show that under the secondary wave,the beach has different degrees of erosion.The main erosion of the beach profile is generally located in the wave breaking zone below the water level,but when the wave condition increases,the erosion will extend to the area above the water level.In the experimental conditions,the higher the sea level,the higher the wave height and the period,the larger the secondary wave after the breakwater,the greater the deformation of the beach profile and the greater the erosion depth.The erosion and deposition sites of the beach profile under the secondary wave are basically similar under the two different slopes of the integrated slope and the single slope,and the section stability is equivalent.