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The extreme 2013/14 winter storms: Regional patterns in multi-annual beach recovery
Geomorphology ( IF 3.9 ) Pub Date : 2021-06-11 , DOI: 10.1016/j.geomorph.2021.107828
Aikaterini Konstantinou , Christopher Stokes , Gerd Masselink , Timothy Scott

Understanding the mechanisms and timescales required for beaches to recover from extreme storm events is fundamental for coastal management worldwide. Yet the post-storm recovery characteristics of different beach types have rarely been investigated over multi-annual timescales. Previous work along the southwest coast of England has suggested that the magnitude and alongshore variability of beach response to storms can be grouped into four key response types controlled by the level of exposure, angle of storm wave approach and degree of embaymentisation. This study aims to enhance our understanding of the spatial and temporal patterns of post-storm beach recovery within this storm response classification framework. Analysis was based on morphological survey data from 23 sites along the southwest coast of England collected between 2012 and 2017. We found that beaches that responded similarly to the unprecedented storm sequence of 2013/14, recovered in a similar manner too, and that spatio-temporal patterns of post-storm recovery can, for the most part, also be described by four coherent classes. In terms of complete recovery to pre-2013/14 volumes, 7 of the 23 beaches we studied recovered >90% of their sediment within 3 years or less, including some of the most affected sites. The magnitude of intertidal beach volume recovered (in the order of 1-100m3m-1) was well correlated with the storm erosion volume (R = -0.81, p = 0.00) and, importantly, was similar for beaches within the same response class. Fully exposed, cross-shore dominated beaches experienced the highest gross erosion and recovery volumes, but showed the lowest net recovery after 3 years (median: 74% volume recovered), while semi-exposed cross-shore dominated beaches showed lower gross change, but the highest net recovery (median: 93% volume recovered).In most cases, the spatial pattern of recovery mirrored that of the storm impact, regardless of whether the beach was cross-shore or alongshore dominant. The observed coherency within each of the four studied beach response classes indicates that regional monitoring programmes could make considerable cost savings by strategically targeting monitoring at representative sites within each class, rather than monitoring all beaches within a region.



中文翻译:

2013/14 年极端冬季风暴:多年海滩恢复的区域模式

了解海滩从极端风暴事件中恢复所需的机制和时间表对于全球沿海管理至关重要。然而,很少有人在多年的时间尺度上调查不同海滩类型的风暴后恢复特征。以前在英格兰西南海岸的工作表明,海滩对风暴响应的幅度和沿海变化可分为四种关键响应类型,这些响应类型由暴露水平、风暴波接近角度和海湾化程度控制。本研究旨在增强我们对风暴响应分类框架内风暴后海滩恢复的空间和时间模式的理解。分析基于 2012 年至 2017 年间收集的英格兰西南海岸沿线 23 个地点的形态学调查数据。我们发现,对 2013/14 史无前例的风暴序列做出类似反应的海滩也以类似的方式恢复,而且风暴后恢复的时空模式在大多数情况下也可以用四个连贯的类别来描述。就完全恢复到 2013/14 年之前的容量而言,我们研究的 23 个海滩中有 7 个在 3 年或更短的时间内恢复了 90% 以上的沉积物,包括一些受影响最严重的地点。潮间带滩体积恢复量级(1-100m量级)我们研究的 23 个海滩中有 7 个在 3 年或更短的时间内恢复了 90% 以上的沉积物,包括一些受影响最严重的地点。潮间带滩体积恢复量级(1-100m量级)我们研究的 23 个海滩中有 7 个在 3 年或更短的时间内恢复了 >90% 的沉积物,包括一些受影响最严重的地点。潮间带滩体积恢复量级(1-100m量级)3 m -1 ) 与风暴侵蚀量密切相关 (R = -0.81, p = 0.00) 并且,重要的是,对于同一响应类别中的海滩来说是相似的。完全暴露的、以跨岸为主的海滩经历了最高的总侵蚀量和恢复量,但在 3 年后显示出最低的净恢复(中位数:74% 的体积恢复),而半暴露的跨岸为主的海滩显示出较低的总变化,但最高的净回收率(中值:回收了 93% 的体积)。在大多数情况下,回收的空间模式反映了风暴影响的空间模式,无论海滩是跨岸还是沿岸占主导地位。在所研究的四个海滩响应类别中观察到的一致性表明,区域监测计划可以通过战略性地针对每个类别内的代表性地点进行监测,而不是监测一个区域内的所有海滩,从而节省大量成本。

更新日期:2021-06-21
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