1. Stage-discharge rating curves based on satellite altimetry and modeled discharge in the Amazon basin.
- Author
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Paris, Adrien, Dias de Paiva, Rodrigo, Santos da Silva, Joecila, Medeiros Moreira, Daniel, Calmant, Stephane, Garambois, Pierre-André, Collischonn, Walter, Bonnet, Marie-Paule, and Seyler, Frederique
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RATING curve (Hydrology) ,ALTIMETRY ,GEOLOGICAL basins ,REMOTE sensing - Abstract
In this study, rating curves (RCs) were determined by applying satellite altimetry to a poorly gauged basin. This study demonstrates the synergistic application of remote sensing and watershed modeling to capture the dynamics and quantity of flow in the Amazon River Basin, respectively. Three major advancements for estimating basin-scale patterns in river discharge are described. The first advancement is the preservation of the hydrological meanings of the parameters expressed by Manning's equation to obtain a data set containing the elevations of the river beds throughout the basin. The second advancement is the provision of parameter uncertainties and, therefore, the uncertainties in the rated discharge. The third advancement concerns estimating the discharge while considering backwater effects. We analyzed the Amazon Basin using nearly one thousand series that were obtained from ENVISAT and Jason-2 altimetry for more than 100 tributaries. Discharge values and related uncertainties were obtained from the rain-discharge MGB-IPH model. We used a global optimization algorithm based on the Monte Carlo Markov Chain and Bayesian framework to determine the rating curves. The data were randomly allocated into 80% calibration and 20% validation subsets. A comparison with the validation samples produced a Nash-Sutcliffe efficiency ( [ABSTRACT FROM AUTHOR]
- Published
- 2016
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