@article{fdi:010060540,
  title = {{E}valuating surface and subsurface water storage variations at small time and space scales from relative gravity measurements in semiarid {N}iger},
  author = {{P}feffer, {J}. and {C}hampollion, {C}. and {F}avreau, {G}uillaume and {C}appelaere, {B}ernard and {H}inderer, {J}. and {B}oucher, {M}arie and {N}azoumou, {Y}. and {O}i, {M}onique and {M}ouyen, {M}. and {H}enri, {C}. and {L}e {M}oigne, {N}. and {D}eroussi, {S}. and {D}emarty, {J}{\'e}rome and {B}oulain, {N}. and {B}enarrosh, {N}athalie and {R}obert, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he acquisition of reliable data sets representative of hydrological regimes and their variations is a critical concern for water resource assessment. {F}or the subsurface, traditional approaches based on probe measurements, core analysis, and well data can be laborious, expensive, and highly intrusive, while only yielding sparse data sets. {F}or this study, an innovative field survey, merging relative microgravimetry, magnetic resonance soundings, and hydrological measurements, was conducted to evaluate both surface and subsurface water storage variations in a semiarid {S}ahelian area. {T}he instrumental setup was implemented in the lower part of a typical hillslope feeding to a temporary pond. {W}eekly measurements were carried out using relative spring gravimeters during 3 months of the rainy season in 2009 over a 350 x 500 m(2) network of 12 microgravity stations. {G}ravity variations of small to medium amplitude <= 220 nm s(-2)) were measured with accuracies better than 50 nm s(-2), revealing significant variations of the water storage at small time (from 1 week up to 3 months) and space (from a couple of meters up to a few hundred meters) scales. {C}onsistent spatial organization of the water storage variations were detected, suggesting high infiltration at the outlet of a small gully. {T}he comparison with hydrological measurements and magnetic resonance soundings involved that most of the microgravity variations came from the heterogeneity in the vadose zone. {T}he results highlight the potential of time lapse microgravity surveys for detecting intraseasonal water storage variations and providing rich space-time data sets for process investigation or hydrological model calibration/evaluation.},
  keywords = {microgravimetry ; magnetic resonance soundings ; surface water ; groundwater ; vadose zone ; semiarid ; {NIGER} ; {ZONE} {SEMIARIDE} ; {ZONE} {SAHELIENNE}},
  booktitle = {},
  journal = {{W}ater {R}esources {R}esearch},
  volume = {49},
  numero = {6},
  pages = {3276--3291},
  ISSN = {0043-1397},
  year = {2013},
  DOI = {10.1002/wrcr.20235},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060540},
}