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UMR 5672

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Soutenance de Samuel Boury

Energy and Buoyancy Transport by Inertia-Gravity Waves in Non-Linear Stratifications. Application to the Ocean.
When May 14, 2020
from 01:00 to 03:00
Where Visioconférence
Contact Name Samuel Boury
Attendees Samuel Boury
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Inertia-gravity waves contribute to the worldwide transport of energy and momentum in the oceans, and they play a crucial role in stratified mixing through non-linear processes transferring energy from scales to scales such as super-harmonic generation or triadic resonant instability.

Of primary relevance are these waves to the Arctic Ocean, and more particularly energy transport by internal waves created by storms at the surface of the ocean. Due to increasing ice melting in the last decades, the surface of the Arctic Ocean is more exposed to winds and storms than ever and for a longer duration throughout 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 better understanding of how storm energy can be transferred to the ocean, and of how it can propagate through, is a very relevant issue.

Based on these considerations, this thesis explores the impact of the geometry on internal wave propagation in stratified and rotating media, both in the linear and non-linear theory. Different phenomena such as modes, wave resonator, transmission though buoyancy interface, tunneling effect, super-harmonic generation and triadic resonant instability, wave attractors, are discussed. Theory is validated by experiments, through the use of a storm-like axisymmetric wave generator creating inertia-gravity waves in stratified and rotating fluids, in confined and unconfined cylindrical geometries. Applications to in-situ measurements are also proposed with comparisons to internal waves in real world stratifications.