Articles | Volume 367
Proc. IAHS, 367, 320–325, 2015
Proc. IAHS, 367, 320–325, 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.