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Attracteurs d'ondes internes à trois dimensions : analyse par tracés de rayons et étude expérimentale

Abstract : Internal waves play a critical rôle in the ocean dynamics. The anisotropic dispersion relation of these waves leads to reflexion law which are different from what we are used to with acoustic waves or light rays. In the PhD thesis, we are interested in structures generated by these waves, in two dimensions then in three dimensions. In most of the 2D geometries, wave path will converge onto an attractor. We firstly study experimentally, in a trapezoidal geometry, the energy aspect of one of these attractors. Then, we survey experimentally the future of these attractors in tridimensional geometries. In some of them, reflexion leads to a trapping event in a 2D plan. This phenomenon was firstly studied by means of ray tracing, and was reproduced in both a trapezoidal and a canal geometry. The experimental obtainment of trapping could explain some in-situ measurements done in the Saint Laurent estuary, where internal wave propagation is still under scrutiny. This thesis is enhanced by two experimental studies on propagation and reflexion of an internal wave beam. Firstly, the instability generating a mean flow from a beam propagating in a three-dimensional geometry. Secondly, the generation of back-reflected waves from beam reflexion on a curved surface.
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Submitted on : Wednesday, September 5, 2018 - 11:05:33 AM
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Grimaud Pillet. Attracteurs d'ondes internes à trois dimensions : analyse par tracés de rayons et étude expérimentale. Dynamique des Fluides [physics.flu-dyn]. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSEN018⟩. ⟨tel-01868186⟩

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