Laraque Alain auteur aut IRD Lopez J. L. auteur aut IRD Yepez S. auteur aut IRD Georgescu P. auteur aut IRD text journalArticle eng text/pdf reformatted digital access The Casiquiare River is a natural channel that connects two of the greatest rivers in the world, the Orinoco and the Amazon in the South American continent. The aim of this paper is to present a review and synthesis of the hydrological and sedimentological knowledge of the Casiquiare River, including the first hydro-sedimentary balance of the Casiquiare fluvial system conducted 9-12 September 2000 at the bifurcation and mouth during the expedition 'Humboldt-Amazonia 2000'. Bathymetric flow discharge and physico-chemical measurements were made at the inlet and outlet of the Casiquiare Channel. The main conclusions of this study indicate that Casiquiare is taking a significant proportion of flow (20% to 30%) from the Upper Orinoco basin to the Amazon basin. Throughout its 356 km-course, this chameleon channel undergoes significant morphological, hydrological, and bio-geochemical variations between the inlet and outlet, whose most visible witnesses are the increase in its width (3 to 4 times), flow (7 to 9 times), and its change in water color (white to black water), under the influence of tributaries coming from vast forest plains. specialized Casiquiare Orinoco Amazon bifurcation hydro-sedimentary budget VENEZUELA 062 Descroix Luc ed. edt IRD Mahé Gil ed. edt IRD Laraque Alain ed. edt IRD Ribolzi Olivier ed. edt IRD Lacombe G. ed. edt IRD 11 10 art. 2068 [17 ] 2019 https://www.documentation.ird.fr/hor/fdi:010077346 10.3390/w11102068 [F A010085542] https://www.documentation.ird.fr/hor/fdi:010077346 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010077346.pdf IRD - Base Horizon / Pleins textes 2020-01-07 2025-02-24 fdi:010077346 fre