Auswahl der wissenschaftlichen Literatur zum Thema „Ondes non-linéaires internes“
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Dissertationen zum Thema "Ondes non-linéaires internes"
RAMIREZ, CAROLINE. „Contribution à l'étude des ondes internes non-linéaires en milieu tournant“. Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10221.
Der volle Inhalt der QuelleHusseini, Pauline. „Interactions non-linéaires d’ondes internes de gravité et mélange en milieu stratifié“. Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1285.
Der volle Inhalt der QuelleTo be able to explain the oceanic mixing, the understanding of phenomena at small scales is crucial, and especially the energy transfers to those scales. Internal waves are studied in this context: by breaking, destabilizing and generating subharmonic triadic resonant instability (TRI), they contribute to this transfer. Our experimental study is focusing on wave propagation during long times. Previous experiments conducted under these conditions within the team had led, after several hours, to a profile showing clear mixing layers. The physical explanation given until then, purely turbulent, was incorrect. Our experimental setup actually places us in a singular situation where the stratification is modified jointly by wave propagation and by double diffusion: mixing layers can thus be present and the fluid behaves like a waveguide. In addition, stratification strongly modified by the waves has a feedback effect on their propagation: the daughter waves resulting from the TRI gradually disappear from the fluid, which limits the transfer to the smallest scales and therefore the mixing. Two internal waves can also interact with each other to generate, this time, a super-harmonic wave whose structure is determined by the structure of the waves that gave birth to it. Our work led to the first experimental demonstration of the generation of such a super-harmonic wave. The results are in excellent agreement with the theory developed by Thorpe (1966). In particular, the super-harmonic wave has the predicted pattern, is observed over a finite range of frequency around the resonant value and the spatial growth rates are very close to those expected theoretically
Grisouard, Nicolas. „Réflexions et réfractions non-linéaires d'ondes de gravité internes“. Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00540608.
Der volle Inhalt der QuelleGrisouard, Nicolas. „Réflexions et réfractions non-linéaires d'ondes de gravité internes“. Grenoble, 2010. http://www.theses.fr/2010GRENU023.
Der volle Inhalt der QuelleInternal wave studies are crucial to the understanding of deep-ocean mixing. In this thesis, we first describe a 2D direct numerical simulation of a wave attractor and validate it against pre-existing experimental data. We then propose a model for the thickness of the attractor along the direction of propagation of energy. We eventually study nonlinear effects induced by the attractor. In a second part, we describe an experimental study of the reflection of plane waves on a sloping wall. Unexpectedly, resonances between different wave harmonics are not observed. However, a horizontal mean flow is generated and the wave characteristics are curved, due to the Doppler effect. 70 to 80% of the incident energy flux is dissipated and transferred to the mean flow, the latter being seemingly generated by wave dissipation. In a third part, we perform a numerical study of the generation of internal solitary waves by an impinging wave beam. We first present direct numerical simulations of this process and show that different solitary wave modes can be excited. Criteria for the selection of a particular mode are put forward, the first one being in terms of phase speeds and the second one based on geometrical arguments. Results are compared with the configuration of the Bay of Biscay in summer. We show that a beam impinging on a thermocline initially at rest cannot generate solitary waves which features agree with oceanic observations. This can be corrected by considering the background flow around the thermocline as found in the Bay of Biscay and independent of the internal wave beam
Zhang, Xiuzhang. „Contribution à l'étude des ondes internes non linéaires en présence d'une topographie ou de rotation“. Grenoble 1, 1986. http://www.theses.fr/1986GRE10147.
Der volle Inhalt der QuelleMercier, Matthieu. „Étude expérimentale de la génération de structures linéaires et non-linéaires (solibores, solitons) en milieu stratifié“. Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2010. http://tel.archives-ouvertes.fr/tel-00542727.
Der volle Inhalt der QuelleBordes, Guilhem. „Interactions non-linéaires d'ondes et tourbillons en milieu stratifié ou tournant“. Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00733175.
Der volle Inhalt der QuelleMoncuquet, Adèle. „Coastal internal waves on the Bay of Biscay shelf and their impact on cross-shelf transport“. Electronic Thesis or Diss., Brest, 2024. http://www.theses.fr/2024BRES0010.
Der volle Inhalt der QuelleThe Bay of Biscay (BoB) is a hot spot for the generation of internal tides and nonlinear internal waves (NLIW). Previous studies have focused mainly on the seaward propagation of internal waves, and less on the shoreward propagation. The shelf region can be affected by internal tides and NLIW transport. The shelf is a complex hydrodynamical region and processes of different scales modify the background stratification and currents. Therefore, internal waves transform as they propagate across the shelf. Internal wave transformation on the shelf and the induced transport remain poorly described worldwide, especially on the BoB shelves. In this thesis, we describe the internal tide and NLIW from mooring observations on the BoB shelf and the induced cross-shelf transport. First, we describe the internal tide and NLIW on the Aquitaine shelf using 22 days of measurements (at 62 and 153 m depth). The results highlight the unexpected importance of the internal tide and NLIW during summer-time stratified conditions. NLIW of depression and elevation, with amplitude reaching up to 1/4th of the water depth and propagating shoreward with different speeds were observed. We observed conditions in which depression and elevation waves coexisted within the same internal tide phase, and could potentially interact. The second part of the work is dedicated to crossshelf net transport, associated with internal waves, or internal waves pumping (IWP) on both the Aquitaine and the Armorican shelf. On the Armorican shelf, IWP was the main driver of total transport near the boundaries and counterbalanced the subtidal dynamics in the middle of the water column. On the Aquitaine shelf, the total cross-shelf transport was a combination of subtidal transport and IWP
Boury, Samuel. „Energy and Buoyancy Transport by Inertia-Gravity Waves in Non-Linear Stratifications. Application to the Ocean“. Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEN014.
Der volle Inhalt der QuelleInertia-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
Renaud, Antoine. „On wave-mean flow interactions in stratified fluid“. Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN059/document.
Der volle Inhalt der QuelleThe dynamics of planetary-scale geophysical flows is strongly influenced by physicalprocesses, mostly unresolved by general circulation numerical models. To parametrisethe coupling between small and large scales, it is essential to understand the underlying physical mechanisms. In this thesis, we study an emblematic problem of interactions between waves and mean flows: the dynamics of zonal flows forced by internal gravity waves. A striking manifestation of these interactions is the quasi-biennial oscillation (QBO) of equatorial winds in the Earth’s atmosphere. First, we describe a transition to chaos in a classical quasilinear model of the QBO and show that these bifurcations persist in direct numerical simulations. Based on these results, we suggest an interpretation for the observation of the unexpected periodicity disruption of the QBO in 2016. The mechanism by which mean flows are generated by waves in stratified fluids requires the consideration of dissipative effects. This phenomenon is analogous to acoustic "streaming". In a second time, we exploit this analogy to study the generation of mean flows by internal gravity waves close to a wall, using multi-scale asymptotic approaches. Finally, we propose an inertial approach to describe the spontaneous emergence of vortical flows in the presence of waves: we apply the tools of statistical mechanics to calculate the partition of energy between small and large scales in the shallow-water model