@article{fdi:010066237,
  title = {{I}mpacts of a large {S}ahelian city on groundwater hydrodynamics and quality : example of {N}iamey ({N}iger)},
  author = {{H}assane, {A}. {B}. and {L}educ, {C}hristian and {F}avreau, {G}uillaume and {B}ekins, {B}. {A}. and {M}argueron, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he management of groundwater resources is very important in the semiarid {S}ahel region, which is experiencing rapid urban development. {I}mpacts of urbanization on groundwater resources were investigated in the unconfined aquifer of the {C}ontinental {T}erminal beneath the city of {N}iamey, {N}iger, using water level and chemical data. {H}ydrodynamic and chemical changes are best described by a combination of factors including the historical development of the city, current land use, water-table depth and topography. {S}easonal groundwater recharge occurs with high spatial variability, as indicated by water-level monitoring in all wells, but there was no interannual trend over the 5-year study period. {G}roundwater salinity shows high spatial variability and a minor rising trend. {T}he highest salinity is in the old city centre, with {N}a-{NO}3 dominant, and it increases seasonally with recharge. {S}alinity is much lower and more variable in the suburbs ({C}a-{HCO}3, {C}a-{NO}3, and {N}a-{NO}3 dominant). {N}itrate is the main ionic contaminant and is seasonally or permanently above the international guidelines for drinking water quality in 36 % of sampled wells, with a peak value of 112 mg {L}-1 {NO}3-{N} (8 meq {L}-1). {C}omparison of urban and rural sites indicates a long-term increase in groundwater recharge and nitrate enrichment in the urban area with serious implications for groundwater management in the region.},
  keywords = {{U}rban groundwater ; {S}easonal recharge ; {C}ontamination ; {S}ahel ; {N}iger ; {NIGER} ; {NIAMEY} ; {SAHEL}},
  booktitle = {},
  journal = {{H}ydrogeology {J}ournal},
  volume = {24},
  numero = {2},
  pages = {407--423},
  ISSN = {1431-2174},
  year = {2016},
  DOI = {10.1007/s10040-015-1345-z},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066237},
}