Evidence of the critical layer mechanism in growing wind waves

Evidence of the critical layer mechanism in growing wind waves
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风浪增长的临界层机制的证据

DOI:
10.1017/jfm.2022.714
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发表时间:
2022
影响因子:
3.7
通讯作者:
Veron, F.
Veron, F.
中科院分区:
工程技术2区
文献类型:
--
作者:
Carpenter, J.R.;Buckley, M.P.;Veron, F.

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使用一种新颖的波浪增长诊断方法对风产生的波浪上的气流进行高分辨率实验室测量,该诊断可以量化迈尔斯风波增长关键层机制的存在。波增长诊断是基于线性稳定性分析制定的,其增长速率与压力重建方法以及其他不太直接的方法所发现的增长速率非常吻合。这一发现,再加上气流测量和线性稳定性(临界层)理论的预测之间的密切一致性,表明迈尔斯的临界层机制可以导致年轻(波龄摩擦速度)风力波浪中显着的波浪增长。
Highly resolved laboratory measurements of the airflow over wind-generated waves are examined using a novel wave growth diagnostic that quantifies the presence of Miles’ critical layer mechanism of wind-wave growth. The wave growth diagnostic is formulated based on a linear stability analysis, and results in growth rates that agree well with those found by a pressure reconstruction method as well as other, less direct, methods. This finding, combined with a close agreement between the airflow measurements and the predictions of linear stability (critical layer) theory, demonstrate that the Miles’ critical layer mechanism can cause significant wave growth in young (wave age the friction velocity) wind-forced waves.
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