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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2016-355
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).
Estimating epikarst water storage by time-lapse surface to depth gravity measurements
Cédric Champollion, Sabrina Devile, Jean Chéry, Erik Doerflinger, Nicolas Le Moigne, Roger Bayer, and Philippe Vernant Laboratoire Géosciences Montpellier, Université Montpellier, 34090 Montpellier, France
Abstract. In this study we attempt to evaluate the magnitude of epikarstic water storage variation in various karst settings using a relative spring gravimeter. Gravity measurements are performed two times a year at the surface and inside caves at different depths on three karst aquifers in southern France: two limestone karst systems and one dolomite karst system. We find that water storage variations occur mainly in the first ten meters of karst unsaturated zone. Afterward, surface to depth gravity measurements are compared between the sites with respect of net water inflow. A difference of seasonal water storage is evidenced probably associated with the lithology. The transmissive function of the epikarst has been partially deduced from the water storage change estimation. Long (> 6 months) and short (< 6 months) transfer time are revealed in the dolomite and in the limestone respectively.

Citation: Champollion, C., Devile, S., Chéry, J., Doerflinger, E., Le Moigne, N., Bayer, R., and Vernant, P.: Estimating epikarst water storage by time-lapse surface to depth gravity measurements, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-355, in review, 2017.
Cédric Champollion et al.
Cédric Champollion et al.
Cédric Champollion et al.

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Short summary
Gravity monitoring at the surface and in-situ (in caves) has been conducted in a karst hydro-system in the south of France (Larzac plateau). Subsurface water storage is evidenced with a spatial variability probably associated to lithology differences. Gravity allows to estimate transient water storage at the seasonal scale.
Gravity monitoring at the surface and in-situ (in caves) has been conducted in a karst...
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