阻力系数与海浪频谱宽度的关系

IF 1.3 4区 地球科学 Q4 OCEANOGRAPHY
Dongliang Zhao, Moxin Li
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引用次数: 0

摘要

海面粗糙度或阻力系数归因于海浪各种成分的影响。许多研究都集中在阻力系数与海况(通常用波龄表示)的关系上。然而,迄今为止还没有得到普遍认可的关系,研究结果非常分散,甚至相互矛盾。我们回顾了海面粗糙度随波龄变化的参数,发现频谱峰值 cp 时的相位速度是表征阻力系数的一个重要参数。在波龄相同的情况下,阻力系数随 cp 的增大而增大。与传统概念相反,在相同风速下,cp 越大的老波浪具有越高的海面粗糙度,这是因为更多的波浪成分参与了海气相互作用并加剧了风应力。利用浮标资料和风浪平衡范围理论,我们估算了摩擦速度,并提出波谱的频宽和谱宽是比传统的风速和波龄更适合用于阻力系数参数化的参数。这项研究为通过可靠的海浪频谱估算风应力提供了一种新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dependence of drag coefficient on the spectral width of ocean waves

Dependence of drag coefficient on the spectral width of ocean waves

The sea-surface roughness or drag coefficient is ascribed to the effect of various components of ocean waves. Many studies have been focused on the investigation of the dependence of drag coefficient on sea states that are usually denoted by wave age. However, no universally accepted relationship has been obtained up to now and the results are significantly scattered or even contradicted. We reviewed the parameterizations of sea-surface roughness as a function of wave age, and found that the phase speed at spectral peak cp is an important parameter to characterize the drag coefficient. For the same wave age, drag coefficient increases with increasing cp. Contrary to the traditional concept, the older waves with greater cp possesses higher sea-surface roughness for the same wind speed because more wave components participate the air–sea interaction and intensify the wind stress. With the buoy meansurements and the theory of equilibrium range of wind waves, we estimated fricition velocity and proposed that the frequency bandwidth and spectral width of the wave spectrum are more suitable parameters than the traditional wind speed and wave age to be used to parameterize drag coefficient. This study provides a new way to estimate wind stress through the reliable spectra of ocean waves.

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来源期刊
Journal of Oceanography
Journal of Oceanography 地学-海洋学
CiteScore
3.50
自引率
13.00%
发文量
42
审稿时长
6-12 weeks
期刊介绍: The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.
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