Abstract

The shear resulting from internal wave reflections can play a crucial role in the transport and resuspension of sediments in oceanic conditions. In particular, when these waves undergo a critical reflection phenomenon, the reflected wave can produce a very large shear. Separating the reflected wave from the incident wave is a technical challenge since the two waves share the same temporal frequency. In our study, we present a series of experimental measurements of internal waves in critical reflection configuration and we analyze them using the 2D-VMD-prox decomposition method. This decomposition method was adapted to specifically decompose waves in an internal wave critical reflection, showing an improvement in its performance with respect to preexisting internal wave decomposition methods. Being able to confidently isolate the reflected wave allowed us to compare our results to a viscous and nonlinear model for critical reflection that correctly describes the dependence of the shear rate produced in the boundary as a function of the experimental parameters.

Graphic abstract

中文翻译：

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用于估计分层流体中临界反射内波的变分模式分解

摘要

内部波反射产生的剪切力在海洋条件下的沉积物运输和再悬浮中起着至关重要的作用。特别是，当这些波经历临界反射现象时，反射波会产生很大的剪切力。将反射波与入射波分开是一项技术挑战，因为这两个波共享相同的时间频率。在我们的研究中，我们提出了一系列临界反射内波的实验测量配置，我们使用2D-VMD-prox分解方法对其进行分析。该分解方法适于特定地分解内部波临界反射中的波，相对于预先存在的内部波分解方法，其性能得到了改善。能够可靠地隔离反射波，使我们可以将结果与用于临界反射的粘性非线性模型进行比较，该模型可以正确描述边界处产生的剪切速率与实验参数之间的关系。

图形摘要