轴对称internal wave模的激发和共振增强
Excitation and resonant enhancement of axisymmetric internal wave modes
摘要：
到目前为止，轴对称内波场，这与风暴单体产生的大气内波场和海洋表面风暴产生的近惯性波场有关，已经通过实验实现了使用振荡球或环面作为源。在这里，我们使用一种新的波发生器配置能够激发轴对称内部波场的任意径向形式产生轴对称内部波模式。在建立了轴对称模式传播的理论背景后，考虑到横向和垂直限制，并考虑到弱粘性的影响，我们通过实验产生并研究了不同阶次的模式。我们通过仔细测量波的振幅群速度参数的基础上的波发生器的效率的特征。这建立，我们调查的能力，垂直约束诱导共振，确定了一系列的实验共振峰，同意与理论预测。在共振附近，波场经历向非线性行为的转变，该转变在域的中心轴上开始，并继续侵蚀整个域的波场。
英文摘要：
To date, axisymmetric internal wave fields, which have relevance to atmospheric internal wave fields generated by storm cells and oceanic near-inertial wave fields generated by surface storms, have been experimentally realized using an oscillating sphere or torus as the source. Here, we use a novel wave generator configuration capable of exciting axisymmetric internal wave fields of arbitrary radial form to generate axisymmetric internal wave modes. After establishing the theoretical background for axisymmetric mode propagation, taking into account lateral and vertical confinement, and also accounting for the effects of weak viscosity, we experimentally generate and study modes of different order. We characterize the efficiency of the wave generator through careful measurement of the wave amplitude based upon group velocity arguments. This established, we investigate the ability of vertical confinement to induce resonance, identifying a series of experimental resonant peaks that agree well with theoretical predictions. In the vicinity of resonance, the wave fields undergo a transition to non-linear behaviour that is initiated on the central axis of the domain and proceeds to erode the wave field throughout the domain.
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