Articles | Volume 367
Proc. IAHS, 367, 320–325, 2015
https://doi.org/10.5194/piahs-367-320-2015
Proc. IAHS, 367, 320–325, 2015
https://doi.org/10.5194/piahs-367-320-2015

  03 Mar 2015

03 Mar 2015

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

W. Santini1,2, J.-M. Martinez1,2, R. Espinoza-Villar3, G. Cochonneau1,2, P. Vauchel1,2, J.-S. Moquet4, P. Baby1,2, J.-C. Espinoza5, W. Lavado6, J. Carranza6, and J.-L. Guyot1,2 W. Santini et al.
  • 1IRD (Institut de Recherche pour le Développement), France
  • 2GET (Géosciences Environnement Toulouse), Casilla 18-1209, Lima 18, Peru
  • 3UnB-IG (Universidade de Brasilia- Instituto de Geociencias), Campus Universitário Darcy Ribeiro, Brasilia, Brazil
  • 4USP (Universidade de São Paulo), Av. Prof. Almeida Prado, nº1280 - Butantã, São Paulo, Brazil
  • 5IGP (Instituto Geofisíco del Perú), Calle Badajoz #169 - Mayorazgo IV Etapa - Ate Vitarte, Lima, Peru
  • 6SENAMHI (Servicio Nacional de Meteorología e Hidrología), Casilla 11-1308, Lima 11, Peru

Keywords: Ucayali, Pachitea, Andes, Amazon, erosion, sedimentation, MODIS, Peru, hydrology

Abstract. 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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