Leduc Christian, Favreau G., Marlin C., Dray M. (2000). Comparison of recharge estimates for the two largest aquifers in Niger, based on hydrodynamic and isotopic data. In :
Tracers and modelling in hydrogeology. Wallingford : AIHS, p. 391-399. (Publications - IAHS ; 262). TraM'2000 conference, Liège (BEL), 2000/05.
Titre du document
Comparison of recharge estimates for the two largest aquifers in Niger, based on hydrodynamic and isotopic data
Année de publication
2000
Type de document
Colloque
Auteurs
Leduc Christian, Favreau G., Marlin C., Dray M.
In
Tracers and modelling in hydrogeology
Source
Wallingford : AIHS, 2000,
p. 391-399 (Publications - IAHS ; 262).
Colloque
TraM'2000 conference, Liège (BEL), 2000/05
The hydrodynamic and isotopic characteristics of the two largest phreatic aquifers in Niger have been studied. Even though the climate, geomorphology and vegetation seem similar, these aquifers differ. In the Iullemmeden basin, a seasonal fluctuation of the water table during the rainy season is combined with a significant long-term rise due to a change in land use ; isotopes (18O, 2H, 3H, 14C) show a median renewal rate of between 0.1% and 0.2%. In the Lake Chad basin, seasonal fluctuation is much rarer and the long-term trend is of stability or even a small decline of the water table due to the drying up of the Lake Chad ; isotopes indicate a median renewal rate of between 0.1% and 0.06%. In both cases, the large difference between the extreme values underlines the great variation in time and space of the recharge. (Résumé d'auteur)
Plan de classement
Fonctionnements des systèmes d'eau et modélisation [062EVAEAU02]
Descripteurs
AQUIFERE ; NAPPE PHREATIQUE ; HYDRODYNAMIQUE ; ECOULEMENT ; INFILTRATION ; ANALYSE ISOTOPIQUE ; FACTEUR ANTHROPIQUE ; DENSITE DE POPULATION ; UTILISATION DU SOL ; EAU SOUTERRAINE ; PRECIPITATION ; VARIATION SAISONNIERE ; VARIATION ANNUELLE ; BASSIN SEDIMENTAIRE ; LAC ; MODELISATION ; ETUDE COMPARATIVE
Description Géographique
ZONE ARIDE ; ZONE SEMIARIDE ; NIGER ; TCHAD LAC
Localisation
Fonds IRD [F B010022486]
Identifiant IRD
fdi:010022486
