潜堤影响下的沙质岸滩剖面变化实验研究

An Experimental Study on Changes of Sandy Beach Profiles Under the Effect of Submerged Breakwater

基于波浪水槽实验,考虑规则波作用,开展潜堤影响下的沙质岸滩剖面变化实验研究。实验采用1/10与1/20的组合坡度。分析在相同实验水深条件下,不同潜堤位置、堤顶水深情况下沙质岸滩演变规律。结果表明:潜堤对沙质岸滩剖面变化有较明显影响。在堤顸水深相同时,随着潜堤位置后移,堤后最大冲刷坑深度逐渐增大,同时最大淤积点前移;在同一位置,减淤效果随堤顶水深的增加而减小;当潜堤放置在无潜堤岸滩最大淤积点之前时,防冲减淤效果最好。

Submerged breakwaters have a good efficacy for nourishing sandy beaches and promoting the silting.The variations of sandy beach profiles under the effect of the submerged breakwaters are studied based on wave flume experiment and by taking the regular waves into account.In the experiment,a beach slope of 1/10 and 1/20 is respectively adopted.The evolution of the sandy beach is analyzed under the same water depth and different positions and top water depth of the submerged breakwater.The results show that the submerged breakwater exerts an obvious effect on the variation of sandy profile.If the water depth over the top of the breakwater keeps the same,the depth of the maximum scoured pit behind the breakwater can gradually increase with the breakwater shifting away from the coast,while the largest silting point moves shoreward.At the same position,the efficacy of the silting reduction decreases as the water depth over the breakwater top increases.The best efficacy of scouring prevention and silting reduction obtained from the experiment is that the submerged breakwater is placed ahead of the largest silting point of the case without the breakwater.