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首页> 外文期刊>Journal of Physical Oceanography >Langmuir Turbulence in Coastal Zones: Structure and Length Scales
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Langmuir Turbulence in Coastal Zones: Structure and Length Scales

机译：沿海地区的朗缪尔湍流：结构和长度尺度

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Langmuir turbulence is a boundary layer oceanographic phenomenon of the upper layer that is relevant to mixing and vertical transport capacity. It is a manifestation of imposed aerodynamic stresses and the aggregate horizontal velocity profile due to orbital wave motion (the so-called Stokes profile), resulting in streamwise-elongated, counterrotating cells. The majority of previous research on Langmuir turbulence has focused on the open ocean. Here, we investigate the characteristics of coastal Langmuir turbulence by solving the grid-filtered Craik-Leibovich equations where the distinction between open and coastal conditions is a product of additional bottom boundary layer shear. Studies are elucidated by visualizing Langmuir cell vortices using isosurfaces of Q. We show that different environmental forcing conditions control the length scales of coastal Langmuir cells. We have identified regimes where increasing the Stokes drift velocity and decreasing surface wind stress both act to change the horizontal size of coastal Langmuir cells. Furthermore, wavenumber is also responsible in setting the horizontal extent L-s of Langmuir cells. Along with that, wavenumber that is linked to the Stokes depth delta(s) controls the vertical extent L-h(ssv) of small-scale vortices embedded within the upwelling limb, while the downwelling limb occupies the depth of the water column H for any coastal surface wave forcing (i.e., L-h(d) - H and L-h(ssv) similar to delta(s)). Additional simulations are included to demonstrate insensitivity to the grid resolution and aspect ratio.
机译：朗缪尔湍流是上层的边界层海洋学现象，与混合和垂直输送能力有关。它是施加的空气动力应力和由于轨道波动引起的总水平速度分布（所谓的斯托克斯分布）的一种表现，导致了沿流向伸长的反向旋转的细胞。先前有关Langmuir湍流的大多数研究都集中在开放海洋上。在这里，我们通过求解网格过滤的Craik-Leibovich方程来研究沿海Langmuir湍流的特征，其中开放条件与沿海条件之间的区别是附加的底部边界层剪切力的产物。通过使用Q的等值面可视化Langmuir细胞涡旋来阐明研究。我们表明，不同的环境强迫条件控制着沿海Langmuir细胞的长度尺度。我们已经确定了增加斯托克斯漂移速度和减小表面风应力都可以改变沿海Langmuir细胞水平尺寸的机制。此外，波数还负责设定Langmuir细胞的水平范围L-s。与此相关的是，与斯托克斯深度增量相关的波数控制着埋在上升流分支中的小规模涡旋的垂直范围Lh（ssv），而下降流分支占据了任何沿海地区水柱H的深度。表面波强迫（即Lh（d）-H和Lh（ssv）与delta（s）相似）。包括其他仿真以证明对网格分辨率和纵横比不敏感。

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