@article{fdi:010053089,
  title = {{L}ocal and global hydrological contributions to time-variable gravity in {S}outhwest {N}iger},
  author = {{P}feffer, {J}. and {B}oucher, {M}arie and {H}inderer, {J}. and {F}avreau, {G}uillaume and {B}oy, {J}. {P}. and de {L}inage, {C}. and {C}appelaere, {B}ernard and {L}uck, {B}. and {O}{\¨ie}, {M}onique and {L}e {M}oigne, {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}dvances in methods of observation are essential to ensure a better understanding of changes in water resources considering climate variability and human activities. {T}he {GHYRAF} ({G}ravity and {H}ydrology in {A}frica) experiments aim to combine gravimetric measurements with dense hydrological surveys to better characterize the annual water storage variability in tropical {W}est {A}frica. {T}he first absolute gravimetric measurements were performed in {S}outhwest {N}iger, near a temporary pond where rapid infiltration to an unconfined aquifer occurs. {A}s gravity is sensitive both to local and global variations of water mass distribution, the large-scale hydrological contribution to time-variable gravity has been removed using either {GRACE} satellite data or global hydrology models. {T}he effect of the local water storage changes was modelled using in situ measurements of the water table, soil moisture and pond water level. {T}he adjustment of these simulations to residual ground gravity observations helped to constrain the specific yield to a value ranging between 1.8 and 6.2 per cent. {T}his range of value is consistent, albeit on the low side, with the aquifer water content (6-12 per cent) estimated by magnetic resonance soundings, which are known to slightly overestimate the specific yield in this geological context. {T}he comparison of these two independent geophysical methods shows their potential to constrain the local hydrogeological parameters. {B}esides, this study evidences the worth of correcting the gravity signal for large-scale hydrology before recovering local water storage parameters.},
  keywords = {{S}atellite geodesy ; {T}ime variable gravity ; {H}ydrology ; {P}ermeability and porosity ; {A}frica ; {AFRIQUE} {DE} l'{OUEST} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{G}eophysical {J}ournal {I}nternational},
  volume = {184},
  numero = {2},
  pages = {661--672},
  ISSN = {0956-540{X}},
  year = {2011},
  DOI = {10.1111/j.1365-246{X}.2010.04894.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053089},
}