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首页> 外文期刊>Journal of oceanography >Dependence of seafloor boundary layer thickness on the overlying flow direction: a large eddy simulation study
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Dependence of seafloor boundary layer thickness on the overlying flow direction: a large eddy simulation study

机译:海底边界层厚度对上覆流动方向的依赖性:大涡模拟研究

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摘要

Using large eddy simulation (LES) incorporating the effect of the horizontal component of the earth's rotation vector, we studied the seafloor turbulent boundary layer to investigate the dependence of the boundary layer thickness on the overlying geostrophic flow orientation. The thickest boundary layer appears for the westward geostrophic flow: it is almost twice that of the eastward flow. The turbulent disturbances in the boundary layer are elongated slightly leftward relative to the geostrophic flow. Linear stability analysis for the Ekman's spiral flow showed that the growth rate is maximum for the westward geostrophic flow and the unstable roll-like mode appears, which points slightly leftward relative to the geostrophic flow. These properties correspond to the feature near the bottom of the developed turbulent layer.
机译:我们使用大涡模拟(LES)并结合了地球旋转矢量的水平分量的影响,研究了海底湍流边界层,以研究边界层厚度对上覆的地转流向的依赖性。最厚的边界层出现在向西的地转流:几乎是向东的两倍。边界层中的湍流扰动相对于地转流略向左延伸。 Ekman螺旋流的线性稳定性分析表明,向西的地转流的增长率最大,并且出现了不稳定的卷状模式,相对于地转流略向左。这些属性与展开的湍流层底部附近的特征相对应。

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