Evaluating surface and subsurface water storage variations at small time and space scales from relative gravity measurements in semiarid Niger
Identifieur interne : 004A70 ( Main/Exploration ); précédent : 004A69; suivant : 004A71Evaluating surface and subsurface water storage variations at small time and space scales from relative gravity measurements in semiarid Niger
Auteurs : Julia Pfeffer [France] ; Cédric Champollion [France] ; Guillaume Favreau [France] ; Bernard Cappelaere [France] ; Jacques Hinderer [France] ; Marie Boucher [France] ; Yahaya Nazoumou [Niger] ; Monique Oï [France] ; Maxime Mouyen [France, Taïwan] ; Christopher Henri [France] ; Nicolas Le Moigne [France] ; Sébastien Deroussi [France] ; Jérôme Demarty [France] ; Nicolas Boulain [Australie] ; Nathalie Benarrosh [France] ; Olivier Robert [France]Source :
- Water Resources Research [ 0043-1397 ] ; 2013-06.
Descripteurs français
- Wicri :
- geographic : Niger.
- topic : étude de cas, Eau souterraine, Hydrologie, Construction métallique, Millet.
English descriptors
- KwdEn :
- Absolute gravimeters, Absolute gravity measurements, Absolute gravity surveys, Additional information, Aquifer, Aquifer characterization, Aquifer contribution, Aquifer contributions, Aquifer effects, Aquifer recharge, Atmospheric pressure, Average depth, Background photograph, Base station, Boucher, Cappelaere, Case study, Catchment, Christiansen, Concrete pillar, Continental terminal, Contour lines, Creutzfeldt, Cubic interpolation, Digital elevation model, Double gravity differences, Dynamic variations, Endoreic catchment, Entire color, Favreau, Frequent reoccupation, Geodetic observatory wettzell, Geophys, Geophysical surveys, Google earth, Gravimeter, Gravitational attraction, Gravity, Gravity campaign, Gravity data, Gravity difference, Gravity forces, Gravity increase, Gravity measurements, Gravity network, Gravity signal, Gravity stations, Gravity value, Gravity variations, Gray stripes, Ground water, Groundwater, Groundwater content, Groundwater recharge, Groundwater table, Groundwater table level, Heterogeneity, Highest stage, Hydraulic gradient, Hydrol, Hydrologic process simulation, Hydrological, Hydrological cycle, Hydrological effects, Hydrological measurements, Hydrological modeling, Hydrological models, Hydrological processes, Hydrological regime, Hydrology, Instrumental setup, Intense convective storms, Internal temperature, Inversion, Inversion scheme, Jacob, July, Krone, Land clearance, Large proportion, Less water, Magnetic resonance, Magnetic resonance soundings, Many sources, Massuel, Maximum amplitude, Metal structure, Microgravity, Microgravity data, Microgravity maps, Microgravity measurements, Microgravity signal, Microgravity stations, Microgravity surveys, Microgravity values, Millet, Modeling, Naujoks, Negative values, Neutron, Neutron probe measurements, Neutron probes, Niger, Niger figure, Niger observatory, Niger table, Other stations, Percolation processes, Peugeot, Pfeffer, Piezometric, Piezometric dome, Piezometric measurements, Pond area, Pond axis, Pond level, Pond station, Pond water level, Prism, Proof mass, Quartz spring, Rainfall, Rainfall event, Rainy season, Recharge, Relative gravimeters, Relative gravity measurements, Relative gravity signal, Relative gravity value, Relative spring gravimeters, Residual, Residual signal, Runoff, Sahelian, Sahelian west niger, Same order, Same time, Scintrex, Semiarid, Semiarid niger, Semiarid sahelian environment, September, Several tens, Small gully, Small time, Soil moisture, Soil surface, Soil survey staff, Space scales, Spatial variability, Spatiotemporal variations, Sporadic runoff, Spring gravimeters, Standard deviation, Standard deviations, Standard errors, Study area, Subsurface, Subsurface water storage variations, Such differences, Superconducting gravimeter, Temporal resolutions, Temporal variations, Temporary pond, Temporary ponds, Time variations, Upper limit, Vadose, Vadose water storage, Vadose zone, Vadose zone models, Variability, Various scales, Vertical distribution, Wankama, Wankama catchment, Water balance, Water content, Water content distribution, Water equivalent heights, Water height, Water level, Water resour, Water resource assessment, Water storage, Water storage dynamics, Water storage variations, Weekly maps, West africa, West african monsoon, Whole gravity network.
- Teeft :
- Absolute gravimeters, Absolute gravity measurements, Absolute gravity surveys, Additional information, Aquifer, Aquifer characterization, Aquifer contribution, Aquifer contributions, Aquifer effects, Aquifer recharge, Atmospheric pressure, Average depth, Background photograph, Base station, Boucher, Cappelaere, Case study, Catchment, Christiansen, Concrete pillar, Continental terminal, Contour lines, Creutzfeldt, Cubic interpolation, Digital elevation model, Double gravity differences, Dynamic variations, Endoreic catchment, Entire color, Favreau, Frequent reoccupation, Geodetic observatory wettzell, Geophys, Geophysical surveys, Google earth, Gravimeter, Gravitational attraction, Gravity, Gravity campaign, Gravity data, Gravity difference, Gravity forces, Gravity increase, Gravity measurements, Gravity network, Gravity signal, Gravity stations, Gravity value, Gravity variations, Gray stripes, Ground water, Groundwater, Groundwater content, Groundwater recharge, Groundwater table, Groundwater table level, Heterogeneity, Highest stage, Hydraulic gradient, Hydrol, Hydrologic process simulation, Hydrological, Hydrological cycle, Hydrological effects, Hydrological measurements, Hydrological modeling, Hydrological models, Hydrological processes, Hydrological regime, Hydrology, Instrumental setup, Intense convective storms, Internal temperature, Inversion, Inversion scheme, Jacob, July, Krone, Land clearance, Large proportion, Less water, Magnetic resonance, Magnetic resonance soundings, Many sources, Massuel, Maximum amplitude, Metal structure, Microgravity, Microgravity data, Microgravity maps, Microgravity measurements, Microgravity signal, Microgravity stations, Microgravity surveys, Microgravity values, Millet, Modeling, Naujoks, Negative values, Neutron, Neutron probe measurements, Neutron probes, Niger, Niger figure, Niger observatory, Niger table, Other stations, Percolation processes, Peugeot, Pfeffer, Piezometric, Piezometric dome, Piezometric measurements, Pond area, Pond axis, Pond level, Pond station, Pond water level, Prism, Proof mass, Quartz spring, Rainfall, Rainfall event, Rainy season, Recharge, Relative gravimeters, Relative gravity measurements, Relative gravity signal, Relative gravity value, Relative spring gravimeters, Residual, Residual signal, Runoff, Sahelian, Sahelian west niger, Same order, Same time, Scintrex, Semiarid, Semiarid niger, Semiarid sahelian environment, September, Several tens, Small gully, Small time, Soil moisture, Soil surface, Soil survey staff, Space scales, Spatial variability, Spatiotemporal variations, Sporadic runoff, Spring gravimeters, Standard deviation, Standard deviations, Standard errors, Study area, Subsurface, Subsurface water storage variations, Such differences, Superconducting gravimeter, Temporal resolutions, Temporal variations, Temporary pond, Temporary ponds, Time variations, Upper limit, Vadose, Vadose water storage, Vadose zone, Vadose zone models, Variability, Various scales, Vertical distribution, Wankama, Wankama catchment, Water balance, Water content, Water content distribution, Water equivalent heights, Water height, Water level, Water resour, Water resource assessment, Water storage, Water storage dynamics, Water storage variations, Weekly maps, West africa, West african monsoon, Whole gravity network.
Abstract
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.
Url:
DOI: 10.1002/wrcr.20235
Affiliations:
- Australie, France, Niger, Taïwan
- Alsace (région administrative), Auvergne-Rhône-Alpes, Grand Est, Languedoc-Roussillon, Nouvelle-Galles du Sud, Occitanie (région administrative), Rhône-Alpes, Île-de-France
- Grenoble, Montpellier, Paris, Strasbourg, Sydney
- Université Montpellier 2
Links toward previous steps (curation, corpus...)
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- to stream Istex, to step Curation: 001381
- to stream Istex, to step Checkpoint: 000380
- to stream Main, to step Merge: 004B94
- to stream Main, to step Curation: 004A70
Le document en format XML
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Taipei</wicri:regionArea><wicri:noRegion>Taipei</wicri:noRegion></affiliation></author><author><name sortKey="Henri, Christopher" sort="Henri, Christopher" uniqKey="Henri C" first="Christopher" last="Henri">Christopher Henri</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>IRD, HydroSciences Montpellier, UM2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement></placeName></affiliation></author><author><name sortKey="Le Moigne, Nicolas" sort="Le Moigne, Nicolas" uniqKey="Le Moigne N" first="Nicolas" last="Le Moigne">Nicolas Le Moigne</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Géosciences Montpellier, UMR CNRS/UM2 5243, Université Montpellier 2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement><settlement type="city">Montpellier</settlement></placeName><orgName type="university">Université Montpellier 2</orgName></affiliation></author><author><name sortKey="Deroussi, Sebastien" sort="Deroussi, Sebastien" uniqKey="Deroussi S" first="Sébastien" last="Deroussi">Sébastien Deroussi</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot UMR CNRS 7154, Paris</wicri:regionArea><placeName><region type="region">Île-de-France</region><region type="old region">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Demarty, Jerome" sort="Demarty, Jerome" uniqKey="Demarty J" first="Jérôme" last="Demarty">Jérôme Demarty</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>IRD, HydroSciences Montpellier, UM2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement></placeName></affiliation></author><author><name sortKey="Boulain, Nicolas" sort="Boulain, Nicolas" uniqKey="Boulain N" first="Nicolas" last="Boulain">Nicolas Boulain</name><affiliation wicri:level="3"><country xml:lang="fr">Australie</country><wicri:regionArea>University of Technology Sydney, Plant Biology and Climate Change Cluster, Sydney</wicri:regionArea><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Benarrosh, Nathalie" sort="Benarrosh, Nathalie" uniqKey="Benarrosh N" first="Nathalie" last="Benarrosh">Nathalie Benarrosh</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>IRD, HydroSciences Montpellier, UM2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement></placeName></affiliation></author><author><name sortKey="Robert, Olivier" sort="Robert, Olivier" uniqKey="Robert O" first="Olivier" last="Robert">Olivier Robert</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot UMR CNRS 7154, Paris</wicri:regionArea><placeName><region type="region">Île-de-France</region><region type="old region">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Water Resources Research</title><title level="j" type="alt">WATER RESOURCES RESEARCH</title><idno type="ISSN">0043-1397</idno><idno type="eISSN">1944-7973</idno><imprint><biblScope unit="vol">49</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="3276">3276</biblScope><biblScope unit="page" to="3291">3291</biblScope><biblScope unit="page-count">16</biblScope><date type="published" when="2013-06">2013-06</date></imprint><idno type="ISSN">0043-1397</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0043-1397</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absolute gravimeters</term><term>Absolute gravity measurements</term><term>Absolute gravity surveys</term><term>Additional information</term><term>Aquifer</term><term>Aquifer characterization</term><term>Aquifer contribution</term><term>Aquifer contributions</term><term>Aquifer effects</term><term>Aquifer recharge</term><term>Atmospheric pressure</term><term>Average depth</term><term>Background photograph</term><term>Base station</term><term>Boucher</term><term>Cappelaere</term><term>Case study</term><term>Catchment</term><term>Christiansen</term><term>Concrete pillar</term><term>Continental terminal</term><term>Contour lines</term><term>Creutzfeldt</term><term>Cubic interpolation</term><term>Digital elevation model</term><term>Double gravity differences</term><term>Dynamic variations</term><term>Endoreic catchment</term><term>Entire color</term><term>Favreau</term><term>Frequent reoccupation</term><term>Geodetic observatory wettzell</term><term>Geophys</term><term>Geophysical surveys</term><term>Google earth</term><term>Gravimeter</term><term>Gravitational attraction</term><term>Gravity</term><term>Gravity campaign</term><term>Gravity data</term><term>Gravity difference</term><term>Gravity forces</term><term>Gravity increase</term><term>Gravity measurements</term><term>Gravity network</term><term>Gravity signal</term><term>Gravity stations</term><term>Gravity value</term><term>Gravity variations</term><term>Gray stripes</term><term>Ground water</term><term>Groundwater</term><term>Groundwater content</term><term>Groundwater recharge</term><term>Groundwater table</term><term>Groundwater table level</term><term>Heterogeneity</term><term>Highest stage</term><term>Hydraulic gradient</term><term>Hydrol</term><term>Hydrologic process simulation</term><term>Hydrological</term><term>Hydrological cycle</term><term>Hydrological effects</term><term>Hydrological measurements</term><term>Hydrological modeling</term><term>Hydrological models</term><term>Hydrological processes</term><term>Hydrological regime</term><term>Hydrology</term><term>Instrumental setup</term><term>Intense convective storms</term><term>Internal temperature</term><term>Inversion</term><term>Inversion scheme</term><term>Jacob</term><term>July</term><term>Krone</term><term>Land clearance</term><term>Large proportion</term><term>Less water</term><term>Magnetic resonance</term><term>Magnetic resonance soundings</term><term>Many sources</term><term>Massuel</term><term>Maximum amplitude</term><term>Metal structure</term><term>Microgravity</term><term>Microgravity data</term><term>Microgravity maps</term><term>Microgravity measurements</term><term>Microgravity signal</term><term>Microgravity stations</term><term>Microgravity surveys</term><term>Microgravity values</term><term>Millet</term><term>Modeling</term><term>Naujoks</term><term>Negative values</term><term>Neutron</term><term>Neutron probe measurements</term><term>Neutron probes</term><term>Niger</term><term>Niger figure</term><term>Niger observatory</term><term>Niger table</term><term>Other stations</term><term>Percolation processes</term><term>Peugeot</term><term>Pfeffer</term><term>Piezometric</term><term>Piezometric dome</term><term>Piezometric measurements</term><term>Pond area</term><term>Pond axis</term><term>Pond level</term><term>Pond station</term><term>Pond water level</term><term>Prism</term><term>Proof mass</term><term>Quartz spring</term><term>Rainfall</term><term>Rainfall event</term><term>Rainy season</term><term>Recharge</term><term>Relative gravimeters</term><term>Relative gravity measurements</term><term>Relative gravity signal</term><term>Relative gravity value</term><term>Relative spring gravimeters</term><term>Residual</term><term>Residual signal</term><term>Runoff</term><term>Sahelian</term><term>Sahelian west niger</term><term>Same order</term><term>Same time</term><term>Scintrex</term><term>Semiarid</term><term>Semiarid niger</term><term>Semiarid sahelian environment</term><term>September</term><term>Several tens</term><term>Small gully</term><term>Small time</term><term>Soil moisture</term><term>Soil surface</term><term>Soil survey staff</term><term>Space scales</term><term>Spatial variability</term><term>Spatiotemporal variations</term><term>Sporadic runoff</term><term>Spring gravimeters</term><term>Standard deviation</term><term>Standard deviations</term><term>Standard errors</term><term>Study area</term><term>Subsurface</term><term>Subsurface water storage variations</term><term>Such differences</term><term>Superconducting gravimeter</term><term>Temporal resolutions</term><term>Temporal variations</term><term>Temporary pond</term><term>Temporary ponds</term><term>Time variations</term><term>Upper limit</term><term>Vadose</term><term>Vadose water storage</term><term>Vadose zone</term><term>Vadose zone models</term><term>Variability</term><term>Various scales</term><term>Vertical distribution</term><term>Wankama</term><term>Wankama catchment</term><term>Water balance</term><term>Water content</term><term>Water content distribution</term><term>Water equivalent heights</term><term>Water height</term><term>Water level</term><term>Water resour</term><term>Water resource assessment</term><term>Water storage</term><term>Water storage dynamics</term><term>Water storage variations</term><term>Weekly maps</term><term>West africa</term><term>West african monsoon</term><term>Whole gravity network</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Absolute gravimeters</term><term>Absolute gravity measurements</term><term>Absolute gravity surveys</term><term>Additional information</term><term>Aquifer</term><term>Aquifer characterization</term><term>Aquifer contribution</term><term>Aquifer contributions</term><term>Aquifer effects</term><term>Aquifer recharge</term><term>Atmospheric pressure</term><term>Average depth</term><term>Background photograph</term><term>Base station</term><term>Boucher</term><term>Cappelaere</term><term>Case study</term><term>Catchment</term><term>Christiansen</term><term>Concrete pillar</term><term>Continental terminal</term><term>Contour lines</term><term>Creutzfeldt</term><term>Cubic interpolation</term><term>Digital elevation model</term><term>Double gravity differences</term><term>Dynamic variations</term><term>Endoreic catchment</term><term>Entire color</term><term>Favreau</term><term>Frequent reoccupation</term><term>Geodetic observatory wettzell</term><term>Geophys</term><term>Geophysical surveys</term><term>Google earth</term><term>Gravimeter</term><term>Gravitational attraction</term><term>Gravity</term><term>Gravity campaign</term><term>Gravity data</term><term>Gravity difference</term><term>Gravity forces</term><term>Gravity increase</term><term>Gravity measurements</term><term>Gravity network</term><term>Gravity signal</term><term>Gravity stations</term><term>Gravity value</term><term>Gravity variations</term><term>Gray stripes</term><term>Ground water</term><term>Groundwater</term><term>Groundwater content</term><term>Groundwater recharge</term><term>Groundwater table</term><term>Groundwater table level</term><term>Heterogeneity</term><term>Highest stage</term><term>Hydraulic gradient</term><term>Hydrol</term><term>Hydrologic process simulation</term><term>Hydrological</term><term>Hydrological cycle</term><term>Hydrological effects</term><term>Hydrological measurements</term><term>Hydrological modeling</term><term>Hydrological models</term><term>Hydrological processes</term><term>Hydrological regime</term><term>Hydrology</term><term>Instrumental setup</term><term>Intense convective storms</term><term>Internal temperature</term><term>Inversion</term><term>Inversion scheme</term><term>Jacob</term><term>July</term><term>Krone</term><term>Land clearance</term><term>Large proportion</term><term>Less water</term><term>Magnetic resonance</term><term>Magnetic resonance soundings</term><term>Many sources</term><term>Massuel</term><term>Maximum amplitude</term><term>Metal structure</term><term>Microgravity</term><term>Microgravity data</term><term>Microgravity maps</term><term>Microgravity measurements</term><term>Microgravity signal</term><term>Microgravity stations</term><term>Microgravity surveys</term><term>Microgravity values</term><term>Millet</term><term>Modeling</term><term>Naujoks</term><term>Negative values</term><term>Neutron</term><term>Neutron probe measurements</term><term>Neutron probes</term><term>Niger</term><term>Niger figure</term><term>Niger observatory</term><term>Niger table</term><term>Other stations</term><term>Percolation processes</term><term>Peugeot</term><term>Pfeffer</term><term>Piezometric</term><term>Piezometric dome</term><term>Piezometric measurements</term><term>Pond area</term><term>Pond axis</term><term>Pond level</term><term>Pond station</term><term>Pond water level</term><term>Prism</term><term>Proof mass</term><term>Quartz spring</term><term>Rainfall</term><term>Rainfall event</term><term>Rainy season</term><term>Recharge</term><term>Relative gravimeters</term><term>Relative gravity measurements</term><term>Relative gravity signal</term><term>Relative gravity value</term><term>Relative spring gravimeters</term><term>Residual</term><term>Residual signal</term><term>Runoff</term><term>Sahelian</term><term>Sahelian west niger</term><term>Same order</term><term>Same time</term><term>Scintrex</term><term>Semiarid</term><term>Semiarid niger</term><term>Semiarid sahelian environment</term><term>September</term><term>Several tens</term><term>Small gully</term><term>Small time</term><term>Soil moisture</term><term>Soil surface</term><term>Soil survey staff</term><term>Space scales</term><term>Spatial variability</term><term>Spatiotemporal variations</term><term>Sporadic runoff</term><term>Spring gravimeters</term><term>Standard deviation</term><term>Standard deviations</term><term>Standard errors</term><term>Study area</term><term>Subsurface</term><term>Subsurface water storage variations</term><term>Such differences</term><term>Superconducting gravimeter</term><term>Temporal resolutions</term><term>Temporal variations</term><term>Temporary pond</term><term>Temporary ponds</term><term>Time variations</term><term>Upper limit</term><term>Vadose</term><term>Vadose water storage</term><term>Vadose zone</term><term>Vadose zone models</term><term>Variability</term><term>Various scales</term><term>Vertical distribution</term><term>Wankama</term><term>Wankama catchment</term><term>Water balance</term><term>Water content</term><term>Water content distribution</term><term>Water equivalent heights</term><term>Water height</term><term>Water level</term><term>Water resour</term><term>Water resource assessment</term><term>Water storage</term><term>Water storage dynamics</term><term>Water storage variations</term><term>Weekly maps</term><term>West africa</term><term>West african monsoon</term><term>Whole gravity network</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Niger</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>étude de cas</term><term>Eau souterraine</term><term>Hydrologie</term><term>Construction métallique</term><term>Millet</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">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.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Niger</li><li>Taïwan</li></country><region><li>Alsace (région administrative)</li><li>Auvergne-Rhône-Alpes</li><li>Grand Est</li><li>Languedoc-Roussillon</li><li>Nouvelle-Galles du Sud</li><li>Occitanie (région administrative)</li><li>Rhône-Alpes</li><li>Île-de-France</li></region><settlement><li>Grenoble</li><li>Montpellier</li><li>Paris</li><li>Strasbourg</li><li>Sydney</li></settlement><orgName><li>Université Montpellier 2</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Pfeffer, Julia" sort="Pfeffer, Julia" uniqKey="Pfeffer J" first="Julia" last="Pfeffer">Julia Pfeffer</name></region><name sortKey="Benarrosh, Nathalie" sort="Benarrosh, Nathalie" uniqKey="Benarrosh N" first="Nathalie" last="Benarrosh">Nathalie Benarrosh</name><name sortKey="Boucher, Marie" sort="Boucher, Marie" uniqKey="Boucher M" first="Marie" last="Boucher">Marie Boucher</name><name sortKey="Boucher, Marie" sort="Boucher, Marie" uniqKey="Boucher M" first="Marie" last="Boucher">Marie Boucher</name><name sortKey="Cappelaere, Bernard" sort="Cappelaere, Bernard" uniqKey="Cappelaere B" first="Bernard" last="Cappelaere">Bernard Cappelaere</name><name sortKey="Champollion, Cedric" sort="Champollion, Cedric" uniqKey="Champollion C" first="Cédric" last="Champollion">Cédric Champollion</name><name sortKey="Demarty, Jerome" sort="Demarty, Jerome" uniqKey="Demarty J" first="Jérôme" last="Demarty">Jérôme Demarty</name><name sortKey="Deroussi, Sebastien" sort="Deroussi, Sebastien" uniqKey="Deroussi S" first="Sébastien" last="Deroussi">Sébastien Deroussi</name><name sortKey="Favreau, Guillaume" sort="Favreau, Guillaume" uniqKey="Favreau G" first="Guillaume" last="Favreau">Guillaume Favreau</name><name sortKey="Henri, Christopher" sort="Henri, Christopher" uniqKey="Henri C" first="Christopher" last="Henri">Christopher Henri</name><name sortKey="Hinderer, Jacques" sort="Hinderer, Jacques" uniqKey="Hinderer J" first="Jacques" last="Hinderer">Jacques Hinderer</name><name sortKey="Le Moigne, Nicolas" sort="Le Moigne, Nicolas" uniqKey="Le Moigne N" first="Nicolas" last="Le Moigne">Nicolas Le Moigne</name><name sortKey="Mouyen, Maxime" sort="Mouyen, Maxime" uniqKey="Mouyen M" first="Maxime" last="Mouyen">Maxime Mouyen</name><name sortKey="Oi, Monique" sort="Oi, Monique" uniqKey="Oi M" first="Monique" last="Oï">Monique Oï</name><name sortKey="Pfeffer, Julia" sort="Pfeffer, Julia" uniqKey="Pfeffer J" first="Julia" last="Pfeffer">Julia Pfeffer</name><name sortKey="Robert, Olivier" sort="Robert, Olivier" uniqKey="Robert O" first="Olivier" last="Robert">Olivier Robert</name></country><country name="Niger"><noRegion><name sortKey="Nazoumou, Yahaya" sort="Nazoumou, Yahaya" uniqKey="Nazoumou Y" first="Yahaya" last="Nazoumou">Yahaya Nazoumou</name></noRegion></country><country name="Taïwan"><noRegion><name sortKey="Mouyen, Maxime" sort="Mouyen, Maxime" uniqKey="Mouyen M" first="Maxime" last="Mouyen">Maxime Mouyen</name></noRegion></country><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Boulain, Nicolas" sort="Boulain, Nicolas" uniqKey="Boulain N" first="Nicolas" last="Boulain">Nicolas Boulain</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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