Preprints
https://doi.org/10.5194/egusphere-2022-703
https://doi.org/10.5194/egusphere-2022-703
 
29 Aug 2022
29 Aug 2022
Status: this preprint is open for discussion.

Geoelectrical and hydro-chemical monitoring of karst formation at the laboratory scale

Flore Rembert1, Marie Léger2, Damien Jougnot3, and Linda Luquot2 Flore Rembert et al.
  • 1Univ. Orléans, CNRS, BRGM, ISTO, UMR 7327, Orléans, F-45071, France
  • 2Géosciences Montpellier, Univ Montpellier, CNRS, Univ Antilles, Montpellier, France
  • 3Sorbonne Université, CNRS, EPHE, METIS, F-75005, Paris, France

Abstract. Ensuring sustainable strategies to manage water resources in karst reservoirs requires a better understanding of the mechanisms responsible for conduits formation in the rock mass and the development of detection methods for these hydrological and geochemical processes. In this study, we monitored the electrical conductivity of two limestone core samples during controlled dissolution experiments. We interpret the results with a physics-based model describing the porous medium as effective structural parameters that are tortuosity and constrictivity. We obtain that constrictivity is more affected by calcite dissolution compared to tortuosity. Based on our experimental results and data sets from the literature, we show that the characteristic Johnson length is a valuable structural witness of calcite dissolution impact linking electrical and hydrological properties.

Flore Rembert et al.

Status: open (until 24 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-703', Anonymous Referee #1, 25 Sep 2022 reply
  • RC2: 'Comment on egusphere-2022-703', Anonymous Referee #2, 27 Sep 2022 reply

Flore Rembert et al.

Flore Rembert et al.

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Short summary
The formation of underground cavities, called karsts, resulting from carbonate rock dissolution, is at stake in many environmental and societal issues, notably through risk management and the administration and quality of drinking water resources. Facing natural environment complexity, we propose a laboratory study combining hydro-chemical monitoring, 3D imaging, and non-invasive observation of electrical properties, showing the benefits of geoelectrical monitoring to map karst formation.