Large-Eddy Simulation of Langmuir Turbulence in Pure Wind Seas
Large-Eddy Simulation of Langmuir Turbulence in Pure Wind Seas
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DOI：
10.1175/2007jpo3842.1
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发表时间：
2006-12
影响因子：
3.5
通讯作者：
R. Harcourt;E. D’Asaro
中科院分区：
文献类型：
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作者：
R. Harcourt;E. D’Asaro
摘要利用大涡模拟方法研究了在实际风应力和包括朗缪尔环流影响在内的表面波作用下，海洋上层边界层中湍流动能及其垂直分量的尺度变化。波浪和湍流的相互作用由Craik-Leibovich涡力模拟。水平均匀表面应力τ0和斯托克斯漂移剖面uS（z）由10 m风速U10和表面波年龄CP/U10确定，其中CP是谱峰值相速度，使用经验表面波谱和相关的波龄相关中性阻力系数CD。破波效应不包括在内。混合层深度HML从30米到120米不等，其中0.6 ≤ CP/U10 ≤ 1.2和8 m s−1 < U10 < 70 m s−1，从而解决了大多数可能的海洋条件，其中TKE生产主要是由风和波浪强迫。混合层平均的“体”VKE ω w2 ω/u*2对无量纲Stokes e-fol同样敏感。
Abstract The scaling of turbulent kinetic energy (TKE) and its vertical component (VKE) in the upper ocean boundary layer, forced by realistic wind stress and surface waves including the effects of Langmuir circulations, is investigated using large-eddy simulations (LESs). The interaction of waves and turbulence is modeled by the Craik–Leibovich vortex force. Horizontally uniform surface stress τ0 and Stokes drift profiles uS(z) are specified from the 10-m wind speed U10 and the surface wave age CP/U10, where CP is the spectral peak phase speed, using an empirical surface wave spectra and an associated wave age–dependent neutral drag coefficient CD. Wave-breaking effects are not otherwise included. Mixed layer depths HML vary from 30 to 120 m, with 0.6 ≤ CP/U10 ≤ 1.2 and 8 m s−1 < U10 < 70 m s−1, thereby addressing most possible oceanic conditions where TKE production is dominated by wind and wave forcing. The mixed layer–averaged “bulk” VKE 〈w2〉/u*2 is equally sensitive to the nondimensional Stokes e-fol...