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Energy and Buoyancy Transport by Inertia-Gravity Waves in Non-Linear Stratifications. Application to the Ocean

Abstract : Inertia-gravity waves contribute to the worldwide transport of energy and momentum in the oceans, and theyplay a crucial role in stratified mixing through non-linear processes transferring energy from scales to scalessuch as super-harmonic generation or triadic resonant instability.Of primary relevance are these waves to the Arctic Ocean, and more particularly energy transport by internalwaves created by storms at the surface of the ocean. Due to increasing ice melting in the last decades, thesurface of the Arctic Ocean is more exposed to winds and storms than ever and for a longer durationthroughout the year. The very stratified layers of the ocean can now be disturbed by atmospheric events and,in return, the modified dynamics of energy transport plays a crucial role in climate changes. A betterunderstanding of how storm energy can be transferred to the ocean, and of how it can propagate through, isa very relevant issue.Based on these considerations, this thesis explores the impact of the geometry on internal wave propagationin stratified and rotating media, both in the linear and non-linear theory. Different phenomena such as modes,wave resonator, transmission though buoyancy interface, tunnelling effect, super-harmonic generation andtriadic resonant instability, wave attractors, are discussed. Theory is validated by experiments, through the useof a storm-like axisymmetric wave generator creating inertia-gravity waves in stratified and rotating fluids, inconfined and unconfined cylindrical geometries. Applications to in-situ measurements are also proposed withcomparisons to internal waves in real world stratifications.
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Submitted on : Tuesday, August 25, 2020 - 12:28:10 PM
Last modification on : Saturday, April 2, 2022 - 3:40:53 AM
Long-term archiving on: : Tuesday, December 1, 2020 - 6:22:08 PM


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Samuel Boury. Energy and Buoyancy Transport by Inertia-Gravity Waves in Non-Linear Stratifications. Application to the Ocean. Fluid mechanics [physics.class-ph]. Université de Lyon, 2020. English. ⟨NNT : 2020LYSEN014⟩. ⟨tel-02921569⟩



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