@article{fdi:010087681,
  title = {{P}aleochannel groundwater discharge to the {R}iver {N}iger in the {I}ullemmeden {B}asin estimated by near- surface geophysics and piezometry},
  author = {{M}ahaman, {R}. {A}. and {N}azoumou, {Y}. and {F}avreau, {G}uillaume and {O}usmane, {B}. {I}. and {B}oucher, {M}arie and {B}abaye, {M}. {S}. {A}. and {L}awson, {F}. {M}. {A}. and {V}ouillamoz, {J}ean-{M}ichel and {G}uero, {A}. and {L}egchenko, {A}natoli and {T}aylor, {R}. {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n drylands, groundwater is often the only perennial source of freshwater to sustain domestic water supplies and irrigation. {K}nowledge of the pathways and dynamics of groundwater discharge and recharge is, therefore, essential to inform sustainable and rational management of limited water resources. {T}he lower valley of the {D}allol {M}aouri in {N}iger represents a large fossil tributary (i.e. paleochannel) of the {R}iver {N}iger and drains groundwater regionally from the {I}ullemmeden {B}asin through coarse-grained {Q}uaternary sediments. {T}he objective of this paper is to quantify groundwater discharge within this paleochannel using piezometry and near-surface geophysics ({TDEM}: {T}ime {D}omain {E}lectromagnetics, {MRS}: {M}agnetic {R}esonance {S}ounding). {TDEM} and {MRS} experiments, conducted at 21 sites along 3 transects, show the thickness of the saturated {Q}uaternary alluvium varies from 7 to 19 m with estimated effective porosities ranging from 18 to 38% and a hydraulic conductivity of 0.6-3 x 10(-3) m/s. {D}ense piezometric surveys along drainage channel reveal hydraulic gradients of 0.2-0.3 parts per thousand that generate {D}arcy fluxes of 1000-2000 m(3)/day (dry season, i.e. minimum value). {P}aleochannel discharge, which currently provides baseflow to the {R}iver {N}iger, is the focus of local demand to increase access to water for drinking, livestock watering, and supplementary irrigation.},
  keywords = {{S}emi-arid area ; {G}roundwater flow ; {A}lluvial aquifer ; {NIGER} ; {ZONE} {SEMIARIDE} ; {NIGER} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{E}nvironmental {E}arth {S}ciences},
  volume = {82},
  numero = {9},
  pages = {202 [18 ]},
  ISSN = {1866-6280},
  year = {2023},
  DOI = {10.1007/s12665-023-10861-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087681},
}