Observations of large infragravity wave runup at Banneg Island, France
Observations of large infragravity wave runup at Banneg Island, France
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法国班内格岛大型次重力波上升的观测
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. Fichaut
中科院分区：
文献类型：
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作者：
A. Sheremet;T. Staples;F. Ardhuin;S. Suanez;B. Fichaut
在法国的班纳格岛，西部悬崖上观测到非常高的水位事件（高于天文潮6.5米），暴露于北大西洋的大涌浪。对2009年2月10日风暴期间收集的水动力测量数据的分析显示，出现了异常高（超过2米）的亚重力波上升事件。通过比较爬高观测值与约7米水深的测量值以及简化非线性模型的数值模拟，可以识别出两个不同的亚重力带：80 s的亚重力波，由风暴膨胀的非线性变浅产生;和300 s的波，被困在岛上的潮间带平台上，产生间歇性的低频淹没。我们的分析表明，300 s波是岛上记录的极端水位的关键组成部分。
On Banneg Island, France, very high water‐level events (6.5 m above the astronomical tide) have been observed on the western cliff, exposed to large swells from the North Atlantic. The analysis of hydrodynamic measurements collected during the storm of 10 February 2009 shows unusually high (over 2 m) infragravity wave runup events. By comparing runup observations to measurements in approximately 7 m of water and numerical simulations with a simplified nonlinear model, two distinct infragravity bands may be identified: an 80 s infragravity wave, produced by nonlinear shoaling of the storm swell; and a 300 s wave, trapped on the intertidal platform of the island and generating intermittent, low‐frequency inundation. Our analysis shows that the 300 s waves are a key component of the extreme water levels recorded on the island.