Experimental Study of Reduction of Solitary Wave Run-Up by Emergent Rigid Vegetation on a Beach
Experimental Study of Reduction of Solitary Wave Run-Up by Emergent Rigid Vegetation on a Beach
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DOI：
10.1142/s1793431115400035
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发表时间：
2015-12
影响因子：
1.5
通讯作者：
Yu Yao;Du Ruichao;Jiang Changbo;Zhengjiang Tang;Y. Wancheng
中科院分区：
文献类型：
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作者：
Yu Yao;Du Ruichao;Jiang Changbo;Zhengjiang Tang;Y. Wancheng
人们进行了广泛的研究，以研究红树林在降低波高方面的性能。在本研究中，通过一系列的实验室实验，在长波水槽中进行了研究，通过红树林的淹没和爬高的海啸先导波的减少。淹没和助跑是用高速CCD摄像机测量的。孤立波被用来模拟主导海啸波。五种植被模型，代表三种森林密度和两种树木分布进行了检查，在一个不渗透的斜坡海滩，并与非植被斜坡的波浪反射，透射和助跑。结果表明，当斜坡上存在植被时，入射波高和爬高都可以减少50%。茂密的植被增加了波浪的反射和能量在植被中耗散成湍流，从而减少了波浪的传播。海滩上的归一化波浪爬高随归一化入射波高和森林密度的增加而减小。进一步研究了森林密度对斜坡海滩波浪爬高的影响，并提出了考虑森林密度的经验公式。研究还强调了树木分布对波浪与坡面植被相互作用的重要性，当森林密度不变时，树木的串联和交错排列之间的助跑减少差异可达20%。
Extensive studies have been carried out to study the performance of mangrove forests in wave height reduction. In this study, the reduction of the inundation and run-up of leading tsunami waves by mangrove forests was investigated through a series of laboratory experiments conducted in a long wave tank. The inundation and run-up were measured using a high speed CCD camera. Solitary waves were used to model the leading tsunami waves. Five vegetation models representing three forest densities and two tree distributions were examined on an impermeable sloping beach, and they were compared with the non-vegetated slope in view of wave reflection, transmission, and run-up. Results show that both incident wave height and run-up could be reduced by up to 50% when the vegetation was present on the slope. Dense vegetation reduced the wave transmission because of the increased wave reflection and energy dissipation into turbulence in vegetation. Normalized wave run-up on the beach decreased with the increase of both normalized incident wave height and forest density. Effect of forest density on the wave run-up on the sloping beach was further examined, and an empirical formula with the density incorporated was proposed. The study also highlighted the importance of tree distribution to wave interaction with vegetation on the slope when the forest density was unaltered, and run-up reduction difference between tandem and staggered arrangements of the trees could reach up to 20%.