FRAPPART, F.; PAPA, Fabrice; MARIEU, Vincent; MALBETEAU, Y.; JORDY, F.; CALMANT, Stéphane; DURAND, Fabien; BALA, S.

doi:10.1080/01490419.2014.990591

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FRAPPART, F.

PAPA, Fabrice

MARIEU, Vincent
Environnements et Paléoenvironnements OCéaniques [EPOC]

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Marine Geodesy. 2015-01-20, vol. 38, n° sup1, p. 568-580

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Radar altimetry has demonstrated strong capabilities for the monitoring of water levels of lakes, rivers and wetlands over the last 20 years. 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 to Jason-2.< Réduire

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Satellite altimetry

validation

water level

discharge

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Preliminary Assessment of SARAL/AltiKa Observations over the Ganges-Brahmaputra and Irrawaddy Rivers

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