Alongshore Variability in Coastal Dune Erosion and Post-Storm Recovery, Northern Coast of France
Alongshore Variability in Coastal Dune Erosion and Post-Storm Recovery, Northern Coast of France
复制标题
法国北部海岸沿海沙丘侵蚀和风暴后恢复的沿岸变化
DOI：
10.2112/si88-004.1
复制
发表时间：
2019
影响因子：
--
通讯作者：
V. Sipka
中科院分区：
文献类型：
--
作者：
A. Héquette;M. Ruz;Amar Zemmour;D. Marin;A. Cartier;V. Sipka
埃盖特，A. Ruz，M.H.; Zemmour，A.; Marin，D.; Cartier，A.，和Sipka，V.，2019.法国北方海岸海岸沙丘侵蚀和风暴后恢复的沿岸变化。In：Castelle，B.和Chaumillon，E.（编辑），气候变化沿着热带海外和温带法国大都市海岸演变。海洋研究杂志，第88号特刊，页。25-45.椰子溪（佛罗里达），ISSN 0749 - 0208。正如世界上许多海岸线的沿着一样，法国北方的大潮汐海岸沿着延伸的海岸沙丘是抵御海洋洪水的重要屏障。利用近10年的海上波浪测量、水位记录、风测量以及海滩和前沙丘的原位和机载激光雷达地形调查，分析了风暴对上海滩和前沙丘及其风暴后恢复的影响。我们的研究结果表明，海岸沙丘位于一个相对较短的距离，沿沿着海岸伸展具有相同的波浪暴露可以有显着不同的响应风暴。不仅风暴事件的影响更大的一些沙丘，但风暴后的恢复也不同，从一个前沙丘到另一个。一个强大的沿岸沙丘侵蚀和恢复的变化与沙丘体积变化的正向东梯度，可能与沿岸和岸上定向沉积物供应。我们的测量结果表明，即使在调查期间的第一年，前沙丘经历了显着的侵蚀，渐进的全沙丘恢复发生在沙丘的脚趾，有利于向陆地的沉积物从上海滩的前沙丘通过开发一个沙坡道。在此期间，2013 - 2014年秋冬期间发生了一系列不寻常的密集风暴，对西欧海岸产生了重大影响。其中几场风暴造成了极端的水位，导致沙丘前沿显著后退，一些地方的体积损失巨大。我们的分析表明，在风暴期间达到的最高水位是一个主要因素，解释沙丘侵蚀相比，波能是次要的沿着这macrotidal海岸。我们的研究结果还表明，沙丘体积的变化在风暴和随后的恢复在很大程度上控制了最初的沙丘和上海滩的形态。沙丘前缘体积变化与初始上海滩宽度和沙丘坡脚高程之间存在较强的对应关系，但与初始沙丘高度之间的关系较弱。
ABSTRACT Héquette, A.; Ruz, M.H.; Zemmour, A.; Marin, D.; Cartier, A., and Sipka, V., 2019. Alongshore Variability in Coastal Dune Erosion and Post-Storm Recovery, Northern Coast of France. In: Castelle, B. and Chaumillon, E. (eds.), Coastal Evolution under Climate Change along the Tropical Overseas and Temperate Metropolitan France. Journal of Coastal Research, Special Issue No. 88, pp. 25–45. Coconut Creek (Florida), ISSN 0749-0208. As along many parts of the world's shoreline, the coastal dunes extending along the macrotidal coast of northern France represent important defenses against marine flooding. The impacts of storms on the upper beach and foredunes and their post-storm recovery were analyzed using nearly 10 years of offshore wave measurements, water level records, wind measurements, and in situ and airborne LiDAR topographic surveys of the beach and foredunes. Our results show that coastal dunes located at a relatively short distance apart along a coastal stretch with the same wave exposure can have significantly different responses to storms. Not only the impacts of storm events were greater on some dunes, but post-storm recovery also varied from one foredune to another. A strong alongshore variability in dune erosion and recovery was observed with a positive eastward gradient in dune volume change, probably related to longshore and onshore-directed sediment supply. Our measurements revealed that even where the foredune underwent significant erosion during the first years of the survey period, progressive full dune recovery took place through the development of a sand ramp at the dune toe that favored landward sediment transport from the upper beach to the foredune. This period was followed by an unusual series of closely spaced storms during fall-winter 2013-2014 that had major impacts on the coasts of Western Europe. Several of these storms were responsible for extreme water levels, which resulted in significant retreat of the dune front and massive volume loss in places. Our analyses show that the maximum water levels reached during storms represent a major factor explaining dune erosion compared to wave energy that is of secondary importance along this macrotidal coast. Our results also suggest that dune volume change during storms and subsequent recovery were largely controlled by the initial dune and upper beach morphology. A strong correspondence was found between dune front volume change and initial upper beach width and with dune toe elevation, but a somewhat weaker relationship was observed between dune volume change and initial dune height.
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
影响因子：
3.7
作者：
Neumann B;Vafeidis AT;Zimmermann J;Nicholls RJ
通讯作者：
Nicholls RJ
风暴聚集对海滩剖面变化的影响
影响因子：
2.9
作者：
Karunarathna H
通讯作者：
Karunarathna H