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Isotopic and chemical composition of groundwater in the Bolivian altiplano, present space evolution records hydrologic conditions since 11000 Yr IRD
Coudrain, A.; Talbi, A.; Loubet, M.; Gallaire, Robert; Jusserand, C.; Ramirez, Edson; Ledoux, E..
The phreatic aquifer of the central Altiplano shows a Cl concentration that increases from 0.5 meq l-1 upstream to 150 meq l-1 downstream. The main outflow process from the aquifer is the upward flow E into the unsaturated zone associated to evaporation close to soil surface. A relation has been established for any arid zone areas on the base of isotopic profiles: E (mm yr-1) = 63 Z-l.5 where Z (m) is the water table depth under soil surface. The aquifer under study may have acquired its high chlorine content during last lacustrine phase (Tauca, 12 ka BP). Arguments for this hypothesis are: (i) maximum level of the lake (3780 m) higher than present soil elevation in the area, (ii) same order of salinity in the paleolake and in the more saline groundwater,...
Tipo: Text Palavras-chave: AQUIFERE; EVAPORATION; COMPOSITION CHIMIQUE; SALINITE; ISOTOPE; ZONE ARIDE; LAC; HAUTE ALTITUDE; HYDROGEOLOGIE; PALEOLAC.
Ano: 1999 URL: http://www.documentation.ird.fr/hor/fdi:010026665
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Reconstitution des écoulements souterrains de l'Altiplano bolivien pendant l'Holocène par modélisation hydrogéochimique IRD
Coudrain, A.; Loubet, M.; Guérin, R.; Descloitres, Marc; Talbi, A.; Quintanilla, J.; Ledoux, E..
Tipo: Text Palavras-chave: HYDROGEOLOGIE; ECOULEMENT SOUTERRAIN; AQUIFERE; SALINITE; HYDRODYNAMIQUE; EVAPORATION; FLUX HYDRIQUE; PIEZOMETRIE; CONDUCTIVITE HYDRAULIQUE; SONDAGE; RESISTIVITE; CHLORURE; VARIATION SECULAIRE; HOLOCENE; MODELISATION; PALEOHYDROLOGIE; ALTIPLANO.
Ano: 2000 URL: http://www.documentation.ird.fr/hor/fdi:010021535
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