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<datestamp>2018-01-11</datestamp>
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<title lang=en>Evaluating surface and subsurface water storage variations at small time and space scales from relative gravity measurements in semiarid Niger</title>
<creator>Pfeffer, Julia</creator>
<creator>Champollion, Cedric</creator>
<creator>Favreau, Guillaume</creator>
<creator>Cappelaere, Bernard</creator>
<creator>Hinderer, Jacques</creator>
<creator>Boucher, Marie</creator>
<creator>Nazoumou, Yahaya</creator>
<creator>Oi, Monique</creator>
<creator>Mouyen, Maxime</creator>
<creator>Henri, Christopher</creator>
<creator>Lemoigne, Nicolas</creator>
<creator>Deroussi, Sebastien</creator>
<creator>Demarty, Jerome</creator>
<creator>Boulain, Nicolas</creator>
<creator>Benarrosh, Nathalie</creator>
<creator>Robert, Olivier</creator>
<contributor>Ecole et Observatoire des sciences de la terre de Strasbourg (EOSTS) ; Institut national des sciences de l'Univers (INSU - CNRS) - Université Louis Pasteur - Strasbourg I - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Risques ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Hydrosciences Montpellier (HSM) ; Institut de Recherche pour le Développement (IRD) - Université Montpellier 2 - Sciences et Techniques (UM2) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Département de Géologie ; Université du Québec</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut de Physique du Globe de Paris (IPGP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - IPG PARIS - Université Paris Diderot - Paris 7 (UPD7) - Université de la Réunion (UR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>University of Technology Sydney, Sydney ; Université du Québec</contributor>
<source>ISSN: 0043-1397</source>
<source>EISSN: 1944-7973</source>
<source>Water Resources Research</source>
<publisher>American Geophysical Union</publisher>
<identifier>hal-00857351</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00857351</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00857351</source>
<source>Water Resources Research, American Geophysical Union, 2013, 49 (6), pp.3276-3291. 〈10.1002/wrcr.20235〉</source>
<identifier>DOI : 10.1002/wrcr.20235</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1002/wrcr.20235</relation>
<language>en</language>
<subject lang=en>microgravimetry</subject>
<subject lang=en>magnetic resonance soundings</subject>
<subject lang=en>surface water</subject>
<subject lang=en>groundwater</subject>
<subject lang=en>vadose zone</subject>
<subject lang=en>semiarid</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The acquisition of reliable data sets representative of hydrological regimes and their variations is a critical concern for water resource assessment. For 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. For 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 Sahelian area. The instrumental setup was implemented in the lower part of a typical hillslope feeding to a temporary pond. Weekly measurements were carried out using relative spring gravimeters during 3 months of the rainy season in 2009 over a 350 × 500 m2 network of 12 microgravity stations. Gravity 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. Consistent spatial organization of the water storage variations were detected, suggesting high infiltration at the outlet of a small gully. The comparison with hydrological measurements and magnetic resonance soundings involved that most of the microgravity variations came from the heterogeneity in the vadose zone. The 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</description>
<date>2013-06</date>
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