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Ondes internes solitaires dans le Golfe de Guinée : cartographie et modélisation

Abstract : Internal waves are observed in different locations. They have a key role in the set up of the trophic chain, and they can impact human activities.For instance, in the Gulf of Guinea, internal solitary waves (ISWs) have caused hazards on offshore oil platforms. The aim of the thesis is to identify the generation zones and the directions of propagation of these ISWs, and the environmental conditions (tides, stratification) that can generate them. One the one hand measurements of currents were available, and on the other hand numerical models were used.Measurements of currents were analyzed. Packets of ISWs were identified. Moreover, the potential generation zones of the ISWs, particularly the top of the shelf break, were inferred from their direction of propagation. The monthly repartition of the packets of ISWs revealed a seasonal variability, due to the West African Monsoon, which modified the conditions of the stratification throughout the year.Concerning the modelling, the numerical model HYCOM was used. One regional hydrostatic model of the Gulf of Guinea was built. This regional model was validated for a barotropic configuration (homogeneous ocean) first. Then, a two-layered configuration was set up, and the linear theory of the internal waves was confirmed on the results.Non hydrostatic terms were added to the horizontal velocity equations in HYCOM, to model ISWs. The influence of different physical parameters, such as the Coriolis force, the barotropic forcing, and a mean current was studied on two-layered radial configurations. Finally, a canyon in the middle of the shelf break was set up to assess qualitatively the effect of a 2D bathymetry on the ISWs.
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Submitted on : Monday, September 17, 2018 - 4:52:17 PM
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Emeric Baquet. Ondes internes solitaires dans le Golfe de Guinée : cartographie et modélisation. Sciences de la Terre. Université de Bretagne occidentale - Brest, 2018. Français. ⟨NNT : 2018BRES0028⟩. ⟨tel-01875737⟩

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