Kamagaté Bamory auteur aut IRD Séguis Luc auteur aut IRD Favreau Guillaume auteur aut IRD Seidel J. L. auteur aut IRD Descloitres Marc auteur aut IRD Affaton P. auteur aut IRD text journalArticle fre text/pdf born digital access Hydrological processes and water balance of a tropical crystalline bedrock catchment in Benin (Donga, upper Oueme River). Hydrodynamic, geochemical, and subsurface geophysical investigations, for two consecutive years with contrasting rainfall 2 conditions, were used to characterize the hydrological processes occurring, and the water balance of a 586-km(2) watershed in Benin (Africa). The water table's monitoring shows that recharge occurs by direct infiltration of rainfall, and represents between 5 to 24% of the annual rainfall. Both surface water outflow, limited to the rainy season, and water chemistry indicate a weak groundwater contribution to river discharge. This implies that the calculated variations in annual runoff coefficients (of 14 and 28%) are mainly governed by surface and subsurface flows. To cite this article: B. Kamagati et al., C. R. Geoscience 339 (2007). specialized Benin groundwater hydrochemistry hydrodynamics tropical river 062 339 6 418-429 2007 1631-0713 https://www.documentation.ird.fr/hor/fdi:010040729 10.1016/j.crte.2007.04.003 1631-0713 [F B010040729] https://www.documentation.ird.fr/hor/fdi:010040729 https://www.documentation.ird.fr/intranet/publi/2007/10/010040729.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-11-06 2017-01-25 fdi:010040729 fre