Monitoring of groundwater redistribution in a karst aquifer using a superconducting gravimeter
Paper in proceedings, 2019

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.

Author

Maxime Mouyen

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Space Geodesy and Geodynamics

Laurent Longuevergne

Centre national de la recherche scientifique (CNRS)

Konstantinos Chalikakis

University of Avignon

Naomi Mazzilli

University of Avignon

Chloé Ollivier

University of Avignon

Séverine Rosat

University of Strasbourg

Jacques Hinderer

University of Strasbourg

Cédric Champollion

University of Montpellier

E3S Web of Conferences

22671242 (eISSN)

Vol. 88 03001

2018 Inter-Disciplinary Underground Science and Technology, i-DUST 2018
Avignon, France,

Subject Categories

Water Engineering

Geophysics

Geosciences, Multidisciplinary

DOI

10.1051/e3sconf/20198803001

More information

Latest update

8/20/2019