4.6 Article

Coastal erosion in NW Spain: Recent patterns under extreme storm wave events

期刊

GEOMORPHOLOGY
卷 387, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.geomorph.2021.107767

关键词

Coastal dunes; Coastline retreat; Climate change; Storm frequency; Storm approach angle

向作者/读者索取更多资源

This study analyzed the geomorphic changes in 15 dune-fringed coastlines of Asturias (NW Spain) from 1992 to 2014 to determine specific drivers of erosion, finding that coastline retreat significantly accelerated since 2006, particularly in the 2013/14 period. Increased frequency of unusually strong storm waves and an alteration in storm approach direction were identified as the main catalysts in heightened erosion capacity during this period.
Coastal dunes are sensitive to both anthropic and natural processes of erosion. In this study, we analyse the geomorphic changes in 15 dune-fringed coastlines of Asturias (NW Spain) for the period 1992 to 2014 to determine specific drivers of erosion. Coastline migration patterns were obtained using geospatial analysis of vertical aerial images and field surveys. The annual and maximum wave energy, maximum significant wave height, duration and number of storm events were determined for each climatic year by using available wave data from both recorded buoy data (1997-2014) and the WAM numerical model (1956-2015). The study shows that since 2006, coastline retreat has significantly accelerated along the Asturias coast. In particular, severe erosion of sandy beaches and dunes occurred in 2013/14, reaching up to 40 m of coastline retreat and destroying numerous ports and seafront promenades. Increased frequency of unusually strong storm waves, with significant wave height (H-s) exceeding 9 m, together with an unusual 5 degrees westward variation from the mode in offshore wave approach direction during these storms, appear to be the main catalysts in heightened erosion capacity of storm waves in the 2013/14 period. This resulted in the removal of small dune areas and a severe recession in the easternmost part of the largest (natural) dune fields in the region. Under these stormy periods, foredunes and climbing dunes developed notably pronounced escarpments and blowouts, with sand subsequently relocated into the foreshore and backshore zones. This study demonstrated that increased frequency in powerful storm events (H-s > 9 m) and an alteration in storm approach direction, can lead to significantly enhanced erosion of dune coastlines, even along those that are modally-attuned to high energy events. (C) 2021 Elsevier B.V. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据