Kreis M.B. auteur aut IRD Taupin Jean-Denis auteur aut IRD Patris Nicolas auteur aut IRD Lachassagne Patrick auteur aut IRD Vergnaud-Ayraud V. auteur aut IRD Burte J.D.P. auteur aut IRD Leduc Christian auteur aut IRD Passos Rodrigues Martins E. auteur aut IRD text journalArticle eng text/pdf reformatted digital access In semi-arid areas, groundwater (GW) represents the most reliable resource for water supply. In the semi-arid region of Ceará (Northeastern Brazil), GW of the crystalline fractured aquifers has a salinity higher than expected in this type of environment. This study implemented a multidisciplinary approach based on hydrodynamic (piezometric) and hydrogeochemical (18O, 2H, 3H, 14C, CFC, SF6, Electrical Conductivity, major ions) data to understand the salinization processes. Results demonstrate that GW is generally recent and recharged by meteoric waters mainly through indirect infiltration from evaporated surface water. The study suggests that GW, originally bicarbonated, becomes progressively enriched in chloride due to the dissolution and leaching of salts, during the wet season, which come from meteoric inputs and have precipitated in the unsaturated zone and pond sediments during dryer periods. specialized AQUIFERE EAU SOUTERRAINE RESSOURCES EN EAU SALINISATION HYDRODYNAMIQUE PIEZOMETRIE EAU DE SURFACE HYDROGEOCHIMIE BRESIL ZONE SEMIARIDE 062MECEAU 064GEOCHI 385 393-398 2024 2199-899X Scientific Assembly of the International Association of Hydrological Sciences, 11., Montpellier (FRA), 2022/05/29-2022/06/03 https://www.documentation.ird.fr/hor/fdi:010095089 10.5194/piahs-385-393-2024 2199-899X [F B010095089] https://www.documentation.ird.fr/hor/fdi:010095089 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2025-10/010095089.pdf IRD - Base Horizon / Pleins textes 2025-09-25 2026-03-25 fdi:010095089 fre