Biotic and abiotic factors governing dune response to storm events
Biotic and abiotic factors governing dune response to storm events
复制标题
控制沙丘对风暴事件反应的生物和非生物因素
DOI：
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发表时间：
2021
影响因子：
3.3
通讯作者：
Ó. Ferreira
中科院分区：
文献类型：
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作者：
J. L. Garzon;S. Costas;Ó. Ferreira
沿岸沙丘对风暴事件的反应可能极为多变，因此，沙丘维持其服务的能力，包括保护内陆社区的能力。在这项研究中，生物和非生物因素的作用，决定沙丘退缩的严重驱动的沿着60公里的屏障岛系统的风暴。本评估使用了来自高分辨率卫星图像、数字地形模型和波浪传播模型的数据。评估的非生物因素包括后滨体积，沙丘高度，下漂入口距离，和入射波功率。评价的生物因素是植被覆盖，其特点是从多光谱图像检索的植被指数。结果显示，沙丘后退的沿岸变化很大，范围从可忽略不计的影响到大约。40米的撤退。所有综合因素使我们能够通过多元回归分析解释高达70%的沙丘退缩变异性。在所有调查的因素中，控制沙丘退缩的大小的主要贡献者是后滨体积（更强大的护堤减少撤退），其次是波功率（正常和纵向分量）。此外，沙丘线中局部显著特征的去除导致海岸线变直，高度有助于沙丘退缩热点的发展。其他评价因素对减少海岸后退的影响较小，包括植被，其对沙丘保护的贡献约为一个数量级低于后滨体积提供的。结果突出了区域评估的重要性，以了解背后的大沿岸变化的风暴影响沙丘的原因。他们还指出，这一气候区域的植被对增强沙丘对风暴的抵抗力的影响相对较小。
The alongshore response of dunes to storm events can be extremely variable and, consequently, their capacity to maintain their services, including the protection of hinterland communities. In this study, the role of biotic and abiotic factors determining the magnitude of dune retreat driven by a severe storm along a 60 km barrier island system was investigated. Data from high‐resolution satellite imagery, digital terrain models, and wave propagation models were used in this assessment. The assessed abiotic factors included the backshore volume, dune height, downdrift inlet distance, and incident wave power. The evaluated biotic factor was the vegetation cover, characterized by a vegetation index retrieved from the multispectral imagery. The results revealed large alongshore variability on dune retreat, ranging from negligible impact to ca. 40 m of retreat. All combined factors allowed us to explain up to 70% of the dune retreat variability through a multi‐regression analysis. Among all investigated factors, the major contributor controlling the magnitude of dune retreat was the backshore volume (more robust berms reduced the retreat) followed by the wave power (normal and longitudinal components). Moreover, the removal of local salient features in the dune line caused the straightening of the coastline, highly contributing to the development of dune retreat hotspots. The other evaluated factors had a smaller influence on reducing coastal retreat, including the vegetation, whose contribution to dune protection was around one order of magnitude lower than that provided by the backshore volume. The results highlight the importance of regional assessments to understand the causes behind the large alongshore variability of storm impacts at dunes. They also state the relatively low influence of the vegetation from this climatic region to enhance dune resistance to storms.
影响因子：
3.9
作者：
Olivier Burvingt;G. Masselink;P. Russell;T. Scott
通讯作者：
Olivier Burvingt;G. Masselink;P. Russell;T. Scott