Sediment budget in the Ucayali River basin, an Andean tributary of the Amazon River

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Santini, W. ; Martinez, J.-M. ; Espinoza-Villar, R. ; Cochonneau, G. ; Vauchel, P. ; Moquet, J.-S. ; Baby, P. ; Espinoza, J.-C. ; Lavado, W. ; Carranza, J. ; Guyot, J.-L. (2015)

Formation of mountain ranges results from complex coupling between lithospheric deformation, mechanisms linked to subduction and surface processes: weathering, erosion, and climate. Today, erosion of the eastern Andean cordillera and sub-Andean foothills supplies over 99% of the sediment load passing through the Amazon Basin. Denudation rates in the upper Ucayali basin are rapid, favoured by a marked seasonality in this region and extreme precipitation cells above sedimentary strata, uplifted during Neogene times by a still active sub-Andean tectonic thrust. Around 40% of those sediments are trapped in the Ucayali retro-foreland basin system. Recent advances in remote sensing for Amazonian large rivers now allow us to complete the ground hydrological data. In this work, we propose a first estimation of the erosion and sedimentation budget of the Ucayali River catchment, based on spatial and conventional HYBAM Observatory network.
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