Article Dans Une Revue Marine Geodesy Année : 2015

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

F. Frappart
Fabrice Papa
  • Fonction : Auteur
Y. Malbeteau
  • Fonction : Auteur
F. Jordy
  • Fonction : Auteur
Stéphane Calmant
  • Fonction : Auteur
Fabien Durand
S. Bala
  • Fonction : Auteur

Résumé

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.

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Dates et versions

hal-04590739 , version 1 (28-05-2024)

Identifiants

Citer

F. Frappart, Fabrice Papa, Vincent Marieu, Y. Malbeteau, F. Jordy, et al.. Preliminary Assessment of SARAL/AltiKa Observations over the Ganges-Brahmaputra and Irrawaddy Rivers. Marine Geodesy, 2015, 38 (sup1), pp.568-580. ⟨10.1080/01490419.2014.990591⟩. ⟨hal-04590739⟩
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