Frappart F. auteur aut IRD Papa Fabrice auteur aut IRD Guntner A. auteur aut IRD Werth S. auteur aut IRD da Silva J. S. auteur aut IRD Tomasella J. auteur aut IRD Seyler Frédérique auteur aut IRD Prigent C. auteur aut IRD Rossow W. B. auteur aut IRD Calmant Stéphane auteur aut IRD Bonnet Marie-Paule auteur aut IRD text journalArticle eng text/pdf born digital access This study presents monthly estimates of groundwater anomalies in a large river basin dominated by extensive floodplains, the Negro River Basin, based on the synergistic analysis using multisatellite observations and hydrological models. For the period 2003-2004, changes in water stored in the aquifer is isolated from the total water storage measured by GRACE by removing contributions of both the surface reservoir, derived from satellite imagery and radar altimetry, and the root zone reservoir simulated by WGHM and LaD hydrological models. The groundwater anomalies show a realistic spatial pattern compared with the hydrogeological map of the basin, and similar temporal variations to local in situ groundwater observations and altimetry-derived level height measurements. Results highlight the potential of combining multiple satellite techniques with hydrological modeling to estimate the evolution of groundwater storage. specialized Groundwater Remote sensing Hydrological modeling 062 126 115 6 1588-1594 2011 0034-4257 https://www.documentation.ird.fr/hor/fdi:010053505 10.1016/j.rse.2011.02.003 0034-4257 [F B010053505] https://www.documentation.ird.fr/hor/fdi:010053505 https://www.documentation.ird.fr/intranet/publi/2011/05/010053505.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-05-31 2017-08-23 fdi:010053505 fre