Turbulent and wave kinetic energy budgets in the airflow over wind-generated surface waves
Turbulent and wave kinetic energy budgets in the airflow over wind-generated surface waves
复制标题
风生表面波气流中的湍流和波浪动能收支
DOI：
10.1017/jfm.2021.377
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发表时间：
2021
影响因子：
3.7
通讯作者：
Buckley, Marc P.
中科院分区：
文献类型：
--
作者：
Yousefi, Kianoosh;Veron, Fabrice;Buckley, Marc P.
海洋表面的动量和能量交换是决定海洋状况、天气模式和气候的核心因素。为了研究表面波对海-气能量交换的影响，我们分析了使用粒子图像测速技术在风生表面波上方获得的气流速度的高分辨率实验室测量。速度场进一步分解为平均、波相干和湍流分量，并详细探讨了相应的能量收支。我们特别关注的预算方程，代表湍流的生产，波的生产和波湍流相互作用的条款。在风浪上，湍流动能（TKE）的产生是积极的，在所有的高度与界面附近的一个尖锐的峰值，表明能量从平均剪切湍流。然而，离开地表，TKE的产量接近于零。同样，波动能（WKE）的生产是积极的，在较低的部分的波边界层（WBL），表示能量的转移从平均流的波相干场。在WBL的上部，WKE产生变得稍微为负，其中能量从波扰动转移到平均流。粘性和斯托克斯子层的高度出现作为自然的垂直尺度的TKE和WKE生产条款，分别。波和湍流扰动之间的相互作用表明，能量转移从波的大部分WBL中的湍流和从湍流的波在界面附近的薄层。
The momentum and energy exchanges at the ocean surface are central factors determining the sea state, weather patterns and climate. To investigate the effects of surface waves on the air–sea energy exchanges, we analyse high-resolution laboratory measurements of the airflow velocity acquired above wind-generated surface waves using the particle image velocimetry technique. The velocity fields were further decomposed into the mean, wave-coherent and turbulent components, and the corresponding energy budgets were explored in detail. We specifically focused on the terms of the budget equations that represent turbulence production, wave production and wave–turbulence interactions. Over wind waves, the turbulent kinetic energy (TKE) production is positive at all heights with a sharp peak near the interface, indicating the transfer of energy from the mean shear to the turbulence. Away from the surface, however, the TKE production approaches zero. Similarly, the wave kinetic energy (WKE) production is positive in the lower portion of the wave boundary layer (WBL), representing the transfer of energy from the mean flow to the wave-coherent field. In the upper part of the WBL, WKE production becomes slightly negative, wherein the energy is transferred from the wave perturbation to the mean flow. The viscous and Stokes sublayer heights emerge as natural vertical scales for the TKE and WKE production terms, respectively. The interactions between the wave and turbulence perturbations show an energy transfer from the wave to the turbulence in the bulk of the WBL and from the turbulence to the wave in a thin layer near the interface.
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影响因子：
1.7
作者：
A. Rutgersson;P. Sullivan
通讯作者：
A. Rutgersson;P. Sullivan
影响因子：
3.5
作者：
Husain, Nyla T.;Hara, Tetsu;Sullivan, Peter P.
通讯作者：
Sullivan, Peter P.
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
G. Caulliez
通讯作者：
G. Caulliez
影响因子：
3.7
作者：
W. Melville;A. Fedorov
通讯作者：
A. Fedorov
影响因子：
3.7
作者：
Deike, Luc;Popinet, Stephane;Melville, W. Kendall
通讯作者：
Melville, W. Kendall