The effects of storm clustering on beach profile variability

The effects of storm clustering on beach profile variability
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风暴聚集对海滩剖面变化的影响

DOI:
10.1016/j.margeo.2013.12.007
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发表时间:
2014
期刊:
影响因子:
2.9
通讯作者:
Karunarathna H
Karunarathna H
中科院分区:
地球科学2区
文献类型:
--
作者:
Karunarathna H

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风暴在重塑海岸线方面的影响是众所周知的。此外,在以前的一些研究中已经注意到,风暴密集发生的风暴群的影响要大得多。本文分析和讨论了澳大利亚新南威尔士州纳拉本海滩的风暴潮气候和海滩剖面对风暴群的响应。Narrabeen海滩常年遭受频繁的风暴,因此海滩经历了很大的变化。通过结合海滩剖面调查的历史测量和风暴引起的海滩变化的数值模拟,研究了具有紧密间隔的单个风暴到达海滩的风暴群的影响。通过对风暴群的风暴功率指数及其与海滩宽度变化关系的分析,发现风暴群中单个风暴的强度并不是导致海滩变化的唯一原因,连续风暴之间的时间间隔和风暴后有关海滩的恢复速度也起着重要作用。我们已经量化和比较海滩侵蚀返回水平造成的单一风暴和风暴群。结果发现,海滩侵蚀量产生的风暴群与两个或两个以上的风暴类似的潜在海滩侵蚀量引起的单风暴的重现期高得多。
Impacts of storms in reshaping coastlines are well known. Also, the far greater impact of clusters of storms, where storms occur at close succession, has been noted in a number of previous studies. In this paper, we analyse and discuss the storm wave climate and the beach profile response to clusters of storms at Narrabeen Beach, New South Wales, Australia. Narrabeen Beach is subjected to frequent storms all year round and the beach undergoes substantial variability as a result. The impact of storm clusters with closely spaced individual storms reaching the beach is investigated by combining historic measurements of beach profile surveys and numerical modelling of storm induced beach change. Our analysis of storm power index of storm clusters and its correlation with the change in beach width reveals that the strengths of single storms in a storm cluster alone are not the reason for beach change, but time interval between successive storms and the post-storm recovery speed of the beach concerned also play important roles. We have quantified and compared beach erosion return levels resulting from single storms and storm clusters. It was found that beach erosion volumes resulting from storm clusters with two or more storms resemble potential beach erosion volumes induced by single storms of far higher return periods.
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