%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Frappart, F.
%A Papa, Fabrice
%A Marieu, V.
%A Malbeteau, Y.
%A Jordy, F.
%A Calmant, Stéphane
%A Durand, Fabien
%A Bala, S.
%T Preliminary assessment of SARAL/AltiKa observations over the Ganges-Brahmaputra and Irrawaddy rivers
%D 2015
%L fdi:010065333
%G ENG
%J Marine Geodesy
%@ 0149-0419
%K Satellite altimetry ; validation ; water level ; discharge
%K INDE ; BENGALE GOLFE ; GANGE ; BRAHMAPOUTRE ; IRRAWADDY
%M ISI:000362123500040
%N 1
%P 568-580
%R 10.1080/01490419.2014.990591
%U https://www.documentation.ird.fr/hor/fdi:010065333
%> https://www.documentation.ird.fr/intranet/publi/2015/10/010065333.pdf
%V 38
%W Horizon (IRD)
%X Radar altimetry has demonstrated strong capabilities for the monitoring of water levels of lakes, rivers and wetlands over the last 20years. The Indo-French SARAL/AltiKa mission, launched in February 2013, is the first satellite radar altimetry mission to carry onboard a Ka-band sensor. We propose here to evaluate the potential of this new instrument for land hydrology through comparisons with other altimetry-derived stages and discharges in the Ganges-Brahmaputra and Irrawaddy river basins using its first year of data. Due to the lack of concomitant in situ measurements for the current period, Jason-2 data, previously evaluated against in situ gauge records, were used as reference. Comparisons between Jason-2 and SARAL-derived water levels and discharges, and Jason-2 and Envisat (which flew the same orbit as SARAL from 2002 to 2010)-derived ones, was performed. Time-series of only one year of SARAL-derived water levels and discharges present better performances (lower RMSE and higher R, generally greater than 0.95) than the ones derived from Envisat when compared with Jason-2.
%$ 126 ; 062 ; 032