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中文核心期刊

潜堤对波浪在直立式防浪墙上爬高的影响

Wave run-up on a vertical wall protected by a submerged breakwater

  • 摘要: 对直立式防浪墙前潜堤的空间布置对波浪在直墙上爬高的影响进行了研究.建立简化模型,即直立式防浪墙前海床设计为平底,潜堤设计为直立薄板. 改变潜堤高度及其与防浪墙之间距,研究不同的潜堤布置对波浪在直墙上爬高的影响. 针对线性波浪场,利用数值波浪水槽模拟了潜堤作用下直墙上波浪的爬高现象. 同时建立了理论模型,系统地分析了潜堤布置形式对直墙上波浪爬高的影响. 研究结果表明潜堤相对于水深的高度越大,对波浪在直墙上爬高的影响越大,而在一定的相对高度条件下,潜堤与直立墙之间距对波浪爬高的影响呈现出一定的规律性.

     

    Abstract: Submerged breakwaters have been constructed in coastal zones for shorelineor harbour protection or to prevent beach erosion. In the paper, the waverun-up on a vertical wall protected by a submerged breakwater is analyzed.The physical configurations include a rigid barrier and a semi-infinitelylong channel with finite depth. By means of numerical wave flume technique,the linear incident wave propagation and run-up on the vertical wall aresimulated. In the cases of different distances between the barrier and thewall with a fixed barrier height, the results of numerical simulations showthat the wave run-up depends on the ratio of the distance to the wavelength. There is no difference of the wave run-up on the vertical wall withor without the barrier, when the barrier is located at the anti-nodes of thestanding wave; while the wave run-up with the barrier is lower than thatwithout the barrier, when the barrier is located at the nodes of thestanding wave. Based on the linear wave theory, by matching the velocityalong the barrier and along the gap, the systems of linear equations aboutthe velocity potentials are obtained, i.e. the theoretical model.Furthermore, the wave run-up is further analyzed for more various settingsof barrier height and distance between the barrier and the wall with thetheoretical model. Not only the numerical wave flume simulations, but alsothe analytical results reveal that the wave run-up on the wall stronglydepends on the distance between the barrier and the vertical wall.

     

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