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Theses

Estimation de la bathymétrie par observation de la terre pour les énergies marines renouvelables

Abstract : Bathymetry is a key parameter for marine renewable energies development. The current acquisition these data is made by acoustic sounders on board ships. Synthetic Aperture Radar (SAR) images can be used to acquire bathymetric maps whose resolution could satisfy the actors of the MRE. The objective of the thesis is the evaluation of the potential of new satellites carrying radar imagers for bathymetry estimation and mapping. Repetition of measurements of the Sentinel-1 mission provides Synthetic Aperture Radar (SAR) images of the same area every 6 days. This ability to capture images with sea states very different from one to another allows increasing the probability of capturing favorable conditions to estimate bathymetry with methods exploiting the swell bottom interaction. The approach proposed in this thesis is the use of wave propagation for the purpose of estimating depth. First, the use of a phase-resolved wave propagation model (Boussinesq Ocean & Surf Zone model) allowed establishing, testing and developing a method of bathymetry estimation on several free surfaces of the ocean. With favorable conditions, SAR images of the ocean can be considered as a linear representation of the sea state. Secondly, we adapted and apply the method implemented on the model to SAR images. Simple approaches of data fusion have been applied to exploit of the repetitiveness of the Sentinel-1 mission. Results obtained are able to satisfy the needs of actors in the domain of MRE. The prospects of this work are presented in this document.
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Marc Cloarec. Estimation de la bathymétrie par observation de la terre pour les énergies marines renouvelables. Mécanique des fluides [physics.class-ph]. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEM071⟩. ⟨tel-02623951⟩

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