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首页> 外文期刊>Geophysical and Astrophysical Fluid Dynamics >A laboratory study of global-scale wave interactions in baroclinic flow with topography I: Multiple flow regimes
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A laboratory study of global-scale wave interactions in baroclinic flow with topography I: Multiple flow regimes

机译：具有斜度的斜压流中全球尺度波相互作用的实验室研究I：多种流态

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摘要

A laboratory investigation is presented with the aim of studying systematically the diversity of flows resulting from the interaction of a baroclinic flow with periodic bottom topography. Flow visualisation and particle-tracking experiments were performed using a differentially heated rotating annulus of fluid with sinusoidal bottom topography. Multi-directional regime scans with varying initial locations in parameter space revealed a rich variety of flow regimes, including those with near-axisymmetric flow at upper levels and a weak stationary wave forced by the topography which is evanescent at upper levels, and flows with a strong forced wave at all heights both with and without travelling baroclinic waves. A range of time-dependent and vacillating flows was also found. The parametric occurrence of the principal regimes agrees well with a number of earlier studies, which covered a more limited range and at lower resolution in parameter space. It is clear from these results that multiple flow states at the same point in parameter space are very common in baroclinically unstable flows with topography. The parametric extent of the influence of the topographically forced stationary waves was shown to be qualitatively consistent with the well-known Charney-Drazin criterion for vertical wave propagation.
机译：提出了一项实验室研究，其目的是系统地研究斜压流与周期性底部地形相互作用所产生的流的多样性。使用正弦形底部地形的流体差分加热旋转环进行流动可视化和颗粒跟踪实验。在参数空间中具有不同初始位置的多方向状态扫描显示了多种流动状态，包括在较高水平具有近轴对称流动的流动状态，以及由地形强迫在较高水平处消逝的弱固定波，并在较高水平流动的状态。无论有无斜压波，所有高度的强强制波。还发现了一系列随时间变化的波动。主要制度的参数出现与许多较早的研究非常吻合，这些研究涵盖了更有限的范围和较低的参数空间分辨率。从这些结果可以明显看出，在具有地形的斜压不稳定流动中，参数空间中同一点的多个流动状态非常普遍。地形上受力的固定波影响的参数范围在质量上与众所周知的垂直波传播的Charney-Drazin标准一致。

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