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首页> 外文期刊>Estuarine Coastal and Shelf Science >The role of Sargassum macroalgal wrack in reducing coastal erosion
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The role of Sargassum macroalgal wrack in reducing coastal erosion

机译：海藻藻在减少沿海侵蚀中的作用

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摘要

Sea level rise and increased frequency of high-energy storms are contributing to the retreat of coastlines, impacting both natural features and coastal communities. "Soft solutions", or natural alternatives to engineered structures, have gained popularity in beach erosion mitigation; however, wrack as a method of erosion prevention remains an understudied option. The objective of our study was to test if a globally-distributed macroalgae, Sargassum spp., could act as a natural solution to moderate coastal erosion. We used a flume and increasing volumes of sargassum to consider three erosional processes at specific locations of the cross-shore profile: wave formation offshore, scouring velocity in the swash zone, and erosion on embryonic dunes. As the quantity of sargassum increased, the measureable attributes of these processes were reduced in a strongly significant manner, with large amounts of sargassum linked to 12% wave attenuation, 46% scouring velocity reduction, and 103% dune erosion reduction. Even with the lightest covering of sargassum tested, embryonic dune erosion was reduced 6% when compared to the control. These results indicate sargassum, and likely many other types of wrack, are a viable resource to help mitigate daily beach erosion.
机译：海平面上升和高能量风暴的频率增加正在推动海岸线的撤退，影响自然景观和沿海社区。 “软解决方案”，或工程结构的自然替代品，已在缓解海滩侵蚀方面广受欢迎。然而，作为防止侵蚀的方法，残骸仍然是一个未被充分研究的选择。我们研究的目的是测试全球分布的大型藻类（Sargassum spp。）是否可以作为中度海岸侵蚀的天然解决方案。我们使用水槽和不断增加的海藻的数量来考虑跨岸剖面特定位置的三个侵蚀过程：近海的波浪形成，斜流区的冲刷速度和胚胎沙丘的侵蚀。随着石藻数量的增加，这些过程的可测量属性以非常显着的方式降低，大量的石藻与12％的波衰减，46％的冲刷速度降低和103％的沙丘侵蚀降低有关。与对照相比，即使覆盖了最轻的海藻盖，胚胎沙丘侵蚀也减少了6％。这些结果表明海藻和可能的许多其他类型的沉船是有助于减轻日常海滩侵蚀的可行资源。

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