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首页> 外文期刊>Journal of Physical Oceanography >Mutual Interaction between Surface Waves and Langmuir Circulations Observed in Wave-Resolving Numerical Simulations
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Mutual Interaction between Surface Waves and Langmuir Circulations Observed in Wave-Resolving Numerical Simulations

机译：波浪分辨数值模拟中观察到的表面波与Langmuir循环之间的相互作用

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摘要

Wave-resolving simulations of monochromatic surface waves and Langmuir circulations (LCs) under an idealized condition are performed to investigate the dynamics of wave-current mutual interaction. When the Froude number (the ratio of the friction velocity of wind stress imposed at the surface and wave phase speed) is large, waves become refracted by the downwind jet associated with LCs and become amplitude modulated in the crosswind direction. In such cases, the simulations using the Craik-Leibovich (CL) equation with a prescribed horizontally uniform Stokes drift profile are found to underestimate the intensity of LCs. Voracity budget analysis reveals that horizontal shear of Stokes drift induced by the wave modulation tilts the wind-driven vorticity to the downwind direction, intensifying the LCs that caused the waves to be modulated. Such an effect is not reproduced in the CL equation unless the Stokes drift of the waves modulated by LCs is prescribed. This intensification mechanism is similar to the CL1 mechanism in that the horizontal shear of the Stokes drift plays a key role, but it is more likely to occur because the shear in this interaction is automatically generated by the LCs whereas the shear in the CL1 mechanism is retained only when a particular phase relation between two crossing waves is kept locked for many periods.
机译：进行了在理想化条件下的单色表面波和Langmuir循环（LCS）的波浪分辨模拟，以研究波浪电流相互作用的动态。当FRoude号（在表面和波相速度施加的风应力的摩擦速度的比率）大时，波通过与LCS相关联的下行喷射而变得折射并且变得在交叉风向上调制的幅度。在这种情况下，发现使用具有规定水平均匀的Stokes漂移曲线的Craik-Leibovich（CL）方程的模拟，以低估LCS的强度。 Voracity预算分析显示，波调制引起的斯托克斯漂移的水平剪切使风驱动的涡度倾向于向下行方向，加强导致波的LCS被调制。除非规定由LCS调制的波的斯托克斯漂移，否则不会在CL方程中再现这种效果。这种强化机制类似于CL1机制，因为斯托克斯漂移的水平剪切起到了关键作用，但更有可能发生，因为这种相互作用中的剪切被LCS自动产生，而CL1机构中的剪切是仅当两个交叉波之间的特定相位关系保持锁定多个时段时才保留。

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  • 来源
    《Journal of Physical Oceanography》 |2020年第8期|2323-2339|共17页
  • 作者

    Fujiwara Yasushi; Yoshikawa Yutaka;

  • 作者单位

    Kyoto Univ Grad Sch Sci Kyoto Japan|Japan Soc Promot Sci Tokyo Japan|Univ Tokyo Grad Sch Frontier Sci Kashiwa Chiba Japan;

    Kyoto Univ Grad Sch Sci Kyoto Japan;

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