Journal articles
Monitoring of groundwater redistribution in a karst aquifer using a superconducting gravimeter
Abstract : Geodetic tools monitor the earth's deformation and gravity field. They are presently sensitive enough to record subtle changes triggered by hydrological processes, thus providing complementary data to standard hydrological measurements. Among these tools, superconducting gravimeter (SG) have proven useful to unravel groundwater redistribution, which significantly alter the gravity field. In the frame of the EquipEx MIGA (Matter wave-laser based Interferometer Gravitation Antenna) project, one SG (iOSG-24) was set up in July 2015 in the Low-noise Underground Laboratory (LSBB) at Rustrel, France, in a gallery located 500 m beneath the surface. In this work, we analyse the underground iOSG-24 gravity time series together with hydro-meteorological data and basic gravity modelling. We find that the gravimeter recorded the redistribution of water in the ground and that most of this redistribution occurs in the unsaturated zone located above the gravimeter. Nevertheless, residuals between our model and the gravity data suggest the occurrence of large lateral fluxes and rapid runoff not considered in our model. We discuss how the setting of a second SG, planned in July 2018, at the surface of the LSBB could help unravelling such hydrological processes.
Cited literature [17 references]
https://hal-insu.archives-ouvertes.fr/insu-02047518
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Monday, February 25, 2019 - 8:42:57 AM
Last modification on : Wednesday, October 27, 2021 - 8:14:26 AM
Long-term archiving on: : Sunday, May 26, 2019 - 12:57:00 PM
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Monday, February 25, 2019 - 8:42:57 AM
Last modification on : Wednesday, October 27, 2021 - 8:14:26 AM
Long-term archiving on: : Sunday, May 26, 2019 - 12:57:00 PM
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e3sconf_i-dust2018_03001.pdf
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