Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Marine Geodesy 267-283 GPS hydrology river stage gradient satellite altimetry 2009 PAR00004141 ENG Marine Geodesy 0149-0419 ISI:000270492900002 3 10.1080/01490410903094460 https://www.documentation.ird.fr/hor/PAR00004141 https://www.documentation.ird.fr/intranet/publi/depot/2013-05-29/010059105.pdf 32 Horizon (IRD) This study presents the result of a demonstration of Global Positioning System (GPS) hydrologic studies in a remote area. A GPS campaign was conducted using a GPS-equipped vessel and a GPS buoy to measure water level along Rio Branco, a tributary of the Amazon. The GPS water level data agree well with river gauge data and with ENVISAT radar altimeter measurements. The GPS-estimated river stage gradient of Rio Branco is 5.75 +/- 0.48 cm/km with 99% confidence, which is higher than previous estimates. This result also agrees well with ENVISAT altimetry results. 062 ; 126 UR065 / UR154 Brésil