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Modélisation numérique des ondes atmosphériques issues des couplages solide/océan/atmosphère et applications

Abstract : This thesis deals with the wave propagation problem within the Earth-oceanatmosphere coupled system. A good understanding of the these phenomena has a major importance for seismic and atmospheric explosion studies, especially for planetary missions. Atmospheric wave-forms generated by explosions or surface oscillations can bring valuable information about the source mechanism or the properties of the various propagation media. We develop two new numerical full-wave high-order modeling tools to model the propagation of acoustic and gravity waves in realistic atmospheres. The first one relies on a high-order staggered finite difference method and focus only on the atmosphere. It enables the simultaneous propagation of linear acoustic and gravity waves in stratified viscous and windy atmosphere. This method is validated against quasi-analytical solutions based on the dispersion equations for a stratified atmosphere. It has also been employed to investigate two cases : the atmospheric propagation generated by a meteor impact on Mars for the INSIGHT NASA mission and for the study of tsunami-induced acoutic and gravity waves following the 2004 Sumatra tsunami. The second numerical method resolves the non-linear acoustic and gravity wave propagation in a realistic atmosphere coupled, with topography, to the elastic wave propagation in a visco-elastic solid. This numerical tool relies on a discontinuous Galerkin method to solve the full Navier-Stokes equations in the fluid domain and a continuous Galerkin method to solve the elastodynamics equations in the solid domain. It is validated against analytical solutions and numerical results provided by the finite-difference method. This method could be employed for numerous applications cases such as near-surface Earthquakes, atmospheric explosions from bolide airburst or to investigate non-linear acoustic and gravity wave propagation in a realistic atmosphere.
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Quentin Brissaud. Modélisation numérique des ondes atmosphériques issues des couplages solide/océan/atmosphère et applications. Planétologie. ISAE, 2017. Français. ⟨tel-01893951⟩

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