Utilisation conjointe de données d'altimétrie satellitaire et de modélisation pour le calcul des débits distribués dans le bassin amazonien

Abstract : This thesis proposes the development of a methodology that aims to obtain distributed discharges in the Amazon basin based on satellite altimetry data and modeled discharges. Given recent works and advances, this work focused particularly on the information that can be inferred from the resulting relationships. We used stage-discharge relationships based on Manning's equation that were optimized through a global optimization algorithm adequately configured. Altimetry data was taken from ENVISAT and Jason-2 missions and discharges were estimated for an overlapping period by the MGB-IPH model. A-priori intervals were defined into the SCEM-UA scheme for each optimization's parameter, and the algorithm allowed us to deal with input errors and output uncertainties. We produced a thousand gross database of rating curves and associated confidence intervals. Hydrological coherence was proved by validation with both modeled and in situ discharges. Successfully using an ENVISAT-based RC with Jason-2 data to estimate discharge at a cross-over, we proved that rating curves are not mission-dependent and can be used with any incoming water height data. Geomorphological characteristics of studied section given by our rating curves were validated through comparison with in situ data, inverse modeling of a braided river reach and synthetic rivers test cases.
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Adrien Paris. Utilisation conjointe de données d'altimétrie satellitaire et de modélisation pour le calcul des débits distribués dans le bassin amazonien. Hydrologie. Université Paul Sabatier - Toulouse III; Universidade Federal do Rio Grande do Sul (Porto Alegre, Brésil), 2015. Français. ⟨NNT : 2015TOU30203⟩. ⟨tel-01357059⟩

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