The Hydrological Modeling and Analysis Platform (HyMAP): Evaluation in the Amazon Basin
Le programme d'analyse et de modélisation hydrologique (HYMAP) : Evaluation dans le bassin de l'Amazone
Getirana, Augusto C. V. ; Boone, Aaron ; Yamazaki, D. ; Decharme, Bertrand ; Papa, F. ; Mognard, N.
Recent advances in global ?ow routing schemes have shown the importance of using high-resolution topography for representing ?oodplain inundation dynamics more reliably. This study presents and evaluates the Hydrological Modeling and Analysis Platform (HyMAP), which is a global ?ow routing scheme specifically designed to bridge the gap between current state-of-the-art global ?ow routing schemes by combining their main features and introducing new features to better capture ?oodplain dynamics. The ultimate goals of HyMAP are to provide the scienti?c community with a novel scheme suited to the assimilation of satellite altimetry data for global water discharge forecasts and a model that can be potentially coupled with atmospheric models. In this ?rst model evaluation, HyMAP is coupled with the Interactions between Soil-Biosphere-Atmosphere (ISBA) land surface model in order to simulate the surface water dynamics in the Amazon basin. The model is evaluated over the 1986-2006 period against an unprecedented source of information, including in situ and satellite-based datasets of water discharge and level, ?ow velocity, and ?oodplain extent. Results show that the model can satisfactorily simulate the large-scale features of the water surface dynamics of the Amazon River basin. Among all stream gauges considered, 23% have Nash-Sutcliffe coef?cients (NS) higher than 0.50 and 68% above zero. About 28% of the stations have volume errors lower than 15%. Simulated discharges at O? bidos had NS 5 0.89. Time series of simulated ?oodplains at the basin scale agrees well with satellite-based estimates, with a relative error of 7% and correlation of 0.89. These results indicate nonnegligible improvements in comparison to previous studies for the same region.
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