Cross-comparisons of radar and laser altimetry, GPS measurements and hydrological modelling for the slope determination of the Rio Negro and Rio Branco
Frédéric Frappart(1) , Juan Leon(2) , Naziano Filizola(3) , Mathilde Cauhopé(2) , Frédérique Seyler(2) , Stéphane Calmant(1) , Marie-Paule Bonnet(2) , and Anny Cazenave(1)
18 Av. Edouard Belin,
31401 Toulouse Cedex 9,
(2) LMTG, 18 Av. Edouard Belin, 31401 Toulouse Cedex 9, France
(3) Universidade do Amazonas, Av. Gal. Rodrigo Otávio Jordão Ramos, 3000/Bloco T, 69077000 - Manaus, AM, Brazil
River morphology, which is both a control and consequence of fluvial processes, has received growing recent interest, for the prediction of flood wave propagation, sediment transport, or empirical estimates of discharge. Hydraulic slope is one of the parameter generally used and it is perhaps the most difficult to measure in the field. We present estimations of river slopes in the Negro drainage basin (Amazon basin) from different data sources: radar altimetry from Topex/Poseidon and ENVISAT RA-2, laser altimetry from ICESat, GPS measurements campaigns, leveled in-situ gauges and results from hydrological modeling.