Wind–Wave Interaction for Strong Winds

Author:

Janssen Peter A. E. M.1,Bidlot Jean-Raymond1

Affiliation:

1. a ECMWF, Reading, United Kingdom

Abstract

Abstract In this paper, we revisit the problem of wind–wave interaction with emphasis on strong winds. For these events, it is assumed that nonlinearity is so large that the slope of the wind waves has reached a limiting steepness. Recent observations suggest that the drag decreases with wind in the strong wind speed regime. In this paper, we try to explain this. In the first step, we introduce a model for surface gravity waves and calculate explicitly the background roughness length from the original approach of Janssen. It is found that for young, steep wind sea, the background roughness length almost vanishes, giving a reduced drag. In addition, it is shown that for steep waves, the slowing down of the wind by waves is a nonlinear process; hence, the growth rate of the waves by wind depends in a nonlinear fashion on the wave spectrum. For strong winds, it is found that, as waves are typically steep, this nonlinear effect gives a further reduction of the wind input. As a consequence, in these extreme circumstances, the drag coefficient decreases with wind.

Publisher

American Meteorological Society

Subject

Oceanography

Reference49 articles.

1. Abdalla, S., and P. A. E. M. Janssen, 2019: Monitoring waves and surface winds by satellite altimetry: Applications. Satellite Altimetry over Ocean and Land Surfaces, D. Stammer and A. Cazenave, Eds., CRC Press, 381–426.

2. Semiempirical dissipation source functions for ocean waves. Part I: Definition, calibration, and validation;Ardhuin, F.,2010

3. A physical model for the narrowing of the directional sea wave spectra in the short gravity to gravity-capillary range;Caudal, G.,2002

4. Statistics of the sea surface derived from sun glitter;Cox, C. S.,1954

5. Revised estimates of ocean surface drag in strong winds;Curic, M.,2020

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3