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Spatial structure of internal tidal waves generated on weak topographies

机译：在弱地形上产生的内部潮汐的空间结构

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摘要

The generation of internal gravity waves by barotropic tidal flow passing over a two-dimensional topography is investigated. Rather than calculating the conversion of tidal energy, this study focuses on delineating the geometric characteristics of the spatial structure of the resulting internal wave fields (i.e., the configurations of the internal beams and their horizontal projections) which have usually been ignored. It is found that the various possible wave types can be demarcated by three characteristic frequencies: the tidal frequency, ω_0; the buoyancy frequency, N; and the vertical component of the Coriolis vector or earth's rotation,f. When different possibilities arising from the sequence of these frequencies are considered, there occur 12 kinds of wave structures in the full 3D space in contrast to the 5 kinds identified by the 2D theory. The constant wave phase lines may form as ellipses or hyperbolic lines on the horizontal plane, provided the buoyancy frequency is greater or less than the tidal frequency. The effect that stems from the consideration of the basic flow is also found, which not only serves as the reason for the occurrence of higher harmonics but also increases the wave strength in the direction of basic flow.
机译：研究了正压潮汐流在二维地形上的内部重力波的产生。这项研究不是计算潮汐能的转换，而是着重于描绘通常被忽略的内部波场空间结构的几何特征（即内部光束的构型及其水平投影）。发现可以通过三个特征频率来划分各种可能的波类型：潮汐频率ω_0；潮汐频率ω_0；潮汐频率ω_0。浮力频率N；和科里奥利矢量的垂直分量或地球的自转，f。当考虑到由这些频率的序列引起的不同可能性时，在整个3D空间中会出现12种波结构，而2D理论确定了5种波结构。如果浮力频率大于或小于潮汐频率，则恒定波相位线可以在水平面上形成椭圆或双曲线。还发现了由于考虑基本流动而产生的效果，这不仅是产生高次谐波的原因，而且还增加了基本流动方向上的波强度。

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  • 来源
    《Dynamics of Atmospheres and Oceans》 |2010年第3期|188-205|共18页
  • 作者

    Ping Fan; Vijay P. Singh;

  • 作者单位

    Institute of Mechanics, Chinese Academy of Sciences, No. 15 Beisihuanxi Road, Beijing 100190, China;

    Department of Biological and Agricultural Engineering, Texas A & M University, College Station, TX 77843-2117, USA Department of Civil & Environmental Engineering, Texas A &M University, College Station, TX 77843-2117, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    stratified flow; barotropic tide; internal waves; coriolis force;

    机译：分层流正压潮内部波浪科里奥利力;

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