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Etude couplée modélisation/télédétection pour le suivi des états et bilans hydriques de surface en zone sahélienne

Abstract : In the framework of AMMA program (African Monsoon Multidisciplinary Analysis), the aim of the present work is to provide some elements to better understand and quantify surface processes that impact on sensible and latent heat fluxes over sahelian landscapes. An approach using remote sensing and a SVAT model (Soil-Vegetation-Atmosphere Transfer) has been developed at different spatial scales. The SEtHyS_Savannah model has been adapted to semi-arid environments. The first step has been to calibrate parameters then to validate the model locally using AMMA measurements acquired over a millet and a fallow fields in Niger. Then specific methodologies have been used and developed in order to apply and validate the model at the scale of the AMMA/Niger super-site. Thus SPOT high resolution data have been used to estimate the landuse and the vegetation characteristics over the area. ASAR/ENVISAT data, SEVIRI/MSG and MODIS products have been used to propose a first validation of surface soil moisture and land surface temperature which are two key variables of the hydric and energetic budgets. The model simulations show good agreement with the ground truth measurements and the remote sensing products over the AMMA/Niger super site . This thesis provides multiple outlooks for the study of land-atmosphere interactions and surface hydric budget changes due to climate changes and anthropic pressure.
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Contributor : Stéphane Saux Picart <>
Submitted on : Monday, May 5, 2008 - 5:32:18 PM
Last modification on : Wednesday, December 9, 2020 - 3:08:56 PM
Long-term archiving on: : Friday, September 28, 2012 - 2:30:23 PM


  • HAL Id : tel-00277226, version 1


Stéphane Saux Picart. Etude couplée modélisation/télédétection pour le suivi des états et bilans hydriques de surface en zone sahélienne. Sciences de la Terre. Université Pierre et Marie Curie - Paris VI, 2007. Français. ⟨tel-00277226⟩



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