The effects of wave non-linearity on wave attenuation by vegetation
The effects of wave non-linearity on wave attenuation by vegetation
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DOI：
10.1016/j.coastaleng.2019.01.004
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发表时间：
2019-05
影响因子：
4.4
通讯作者：
K. Phan;M. Stive;M. Zijlema;H. S. Truong;S. Aarninkhof
中科院分区：
文献类型：
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作者：
K. Phan;M. Stive;M. Zijlema;H. S. Truong;S. Aarninkhof
波浪通过红树林的衰减越来越受到关注，特别是在海岸侵蚀和海平面上升加剧的情况下。大量的研究集中在研究波高的降低在一个红树林。然而，对这种衰减过程的了解仍处于起步阶段。为了获得更多的洞察力，进行了一项实验室实验，模拟越南湄公河三角洲沿岸红树林的波浪衰减过程。研究了不同红树林密度和波浪条件下的波高衰减情况。提出了一种新的植被衰减定量方法。波高的减少是在相对长度尺度（即波长的数量）上呈现的，而不是森林的绝对长度尺度（例如每米或每100米）。利用Ursell数研究了波浪非线性对红树林波高衰减的影响。结果表明，波的非线性特性对波在红树林内的衰减有很大的影响。在SWASH中建立了模拟实验的数值模型，并使用实验数据进行了验证。最后，通过数值建模扩展了数据集，以便可以制定每波长波衰减与Ursell数之间的更大范围关系。
Wave attenuation through mangrove forests has received more and more attention, especially in the context of increasing coastal erosion and sea-level-rise. Numerous studies have focused on studying the reduction of wave height in a mangrove forest. However, the understanding of this attenuation process is still in its infancy. In order to obtain more insight, a laboratory experiment, mimicking the processes of wave attenuation by coastal mangroves in the Mekong Delta, Vietnam was conducted. The reduction of wave height for different scenarios of mangrove densities and wave conditions was investigated. A new method to quantify vegetation attenuation induced by vegetation is presented. The wave height reduction is presented over a relative length scale (viz. the number of wavelengths), instead of an absolute length scale of the forest (e.g per meter or per 100 m). The effects of wave non-linearity on the wave height attenuation over the mangrove forest were investigated using the Ursell number. It is suggested that the non-linear character of waves has a strong influence on the attenuation of the waves inside the mangrove forest. A numerical model, mimicking the experiment was constructed in SWASH and validated using the experimental data. Finally, the data set was extended through numerical modelling so that a larger ranging relationship between wave attenuation per wave length and the Ursell number could be formulated.