@inproceedings{fdi:010022486,
  title = {{C}omparison of recharge estimates for the two largest aquifers in {N}iger, based on hydrodynamic and isotopic data},
  author = {{L}educ, {C}hristian and {F}avreau, {G}. and {M}arlin, {C}. and {D}ray, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he hydrodynamic and isotopic characteristics of the two largest phreatic aquifers in {N}iger have been studied. {E}ven though the climate, geomorphology and vegetation seem similar, these aquifers differ. {I}n the {I}ullemmeden 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 (18{O}, 2{H}, 3{H}, 14{C}) show a median renewal rate of between 0.1% and 0.2%. {I}n the {L}ake {C}had 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 {L}ake {C}had ; isotopes indicate a median renewal rate of between 0.1% and 0.06%. {I}n both cases, the large difference between the extreme values underlines the great variation in time and space of the recharge. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{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} ; {ZONE} {ARIDE} ; {ZONE} {SEMIARIDE} ; {NIGER} ; {TCHAD} {LAC} ; {NIAMEY} {REGION} ; {IULLEMMEDEN} {BASSIN} {VERSANT}},
  numero = {262},
  pages = {391--399},
  booktitle = {{T}racers and modelling in hydrogeology},
  year = {2000},
  URL = {https://www.documentation.ird.fr/hor/fdi:010022486},
}