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VARICOSE WAVES

机译:静脉曲张

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摘要

Nonlinear internal waves of depression and elevation are often seen in the coastal ocean. The terms depression/elevation imply waves that have a mode-1 structure (i.e., all isopycnals are displaced in the same direction, either down or up). Higher-mode waves also exist. Here, we see an example of a wave with mode-2 structure (A) propagating onshore (to thernright) followed by a train of short, mode-1 depression waves (B). In the mode-2 wave, isopycnals near the surface are displaced upwards while those at depth are displaced downwards. These waves are sometimes referred to as "varicose" to emphasize the "bulging" nature of the isopycnals. In the middle panel, the background velocity has been removed, leaving the velocity field attributed to the wave. Note the onshore (red) pulse centered at approximately 12 m and the offshore (blue) return flow near the surface. Any return flow beneath the onshore pulse is weak and undetectable in our measurements.
机译:在沿海海洋中经常会看到非线性的内陷和升高波。术语俯冲/俯冲意味着具有模式1结构的波(即所有等向波都沿相同方向向下或向上位移)。高模波也存在。在这里,我们看到了一个波的示例,该波具有模式2结构(A)在陆上(向右)传播,随后是一列短的模式1凹陷波(B)。在模式2波中,地表附近的等深线向上移动,而深部的等深线向下移动。这些波有时被称为“静脉曲张”,以强调等位体的“凸起”性质。在中间面板中,背景速度已被删除,速度场归因于波浪。请注意,以大约12 m为中心的岸上(红色)脉冲和地表附近的岸上(蓝色)回流。在陆上脉冲之下的任何回流都是微弱的,在我们的测量中无法检测到。

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  • 来源
    《Oceanography》 |2008年第4期|28-28|共1页
  • 作者

    Emily Shroyer;

  • 作者单位

    College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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