Along-slope current generation by obliquely incident internal waves
Along-slope current generation by obliquely incident internal waves
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DOI：
10.1017/s0022112001005560
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发表时间：
2001-10
影响因子：
3.7
通讯作者：
O. Zikanov;D. Slinn
中科院分区：
文献类型：
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作者：
O. Zikanov;D. Slinn
进行了一系列数值实验来研究向底部斜坡传播的倾斜入射内波的破裂。考虑临界反射的情况，其中波群速度矢量与水平面之间的角度与底部坡度角匹配。发现流动演化与之前在正常入射波的模拟中观察到的演化明显不同。破碎区雷诺应力的发散导致强烈的沿坡平均流，从而极大地改变了流动结构。该波不会穿透电流，但由于关键层相互作用而在其上表面分解。产生具有近似恒定速度的连续加宽的平均沿坡电流。我们提出了一个基于动量守恒定律和辐射应力概念的简单过程模型。模型预测根据数值结果进行验证，并用于评估海洋中这一过程产生的沿坡流的可能强度。
A series of numerical experiments is performed to investigate the breaking of obliquely incident internal waves propagating towards a bottom slope. The case of critical reflection is considered, where the angle between the wave group velocity vector and the horizontal matches the bottom slope angle. The flow evolution is found to be significantly different from the evolution observed previously in simulations of normally incident waves. The divergence of the Reynolds stress in the breaking zone causes a strong along-slope mean current, which changes the flow structure dramatically. The wave does not penetrate the current but breaks down at its upper surface as the result of a critical layer interaction. A continuously broadening mean along-slope current with an approximately constant velocity is produced. We propose a simple model of the process based on the momentum conservation law and the radiation stress concept. The model predictions are verified against the numerical results and are used to evaluate the possible strength of along-slope currents generated by this process in the ocean.