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Les méthodes de résistivité électrique et de potentiel spontané appliquées aux sites contaminés

Abstract : The purpose of this work is to demonstrate that electrical resistivity and self-potential methods can provide spatial information about the redox potential and the fluid conductivity of a contaminant plume. These methods can therefore be used to optimize the implantation of piezometers. The application of the electrical resistivity tomography to the Entressen landfill (Provence-France) provided a map of the fluid conductivity of the aquifer, which helped us to determine the extension of the contaminant plume. The self-potential signals, which are passively measured over contaminated sites, are associated with two main mechanisms. These mechanisms are the fluid flow (streaming potential) and the presence of organic-rich contaminants in an aquifer ("electro-redox" phenomenon). Strong electrical potential anomalies have been evidenced above contaminated sites, but no physical explanations have been proposed. Therefore, we have developed a natural (bio)-geobattery model, in which bacteria allow the transfer of electron between the reduced and the oxidized parts of the aquifer. The resulting current density produces self potential anomalies recordable at the ground surface. In order to validate this model, we have realized self potential experiments on two contaminated sites (Entressen in France and Trecate in Italy), and on a sandbox with sulfato-reducing bacteria. Both the field and laboratory results are in accordance with the (bio)-geobattery model, showing a linear coupling between the self potential signals and the redox potential.
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https://tel.archives-ouvertes.fr/tel-00007727
Contributor : Véronique Naudet <>
Submitted on : Monday, December 13, 2004 - 12:06:08 PM
Last modification on : Saturday, October 3, 2020 - 3:17:07 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:06:05 PM

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  • HAL Id : tel-00007727, version 1

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Véronique Naudet. Les méthodes de résistivité électrique et de potentiel spontané appliquées aux sites contaminés. Géophysique [physics.geo-ph]. Université de droit, d'économie et des sciences - Aix-Marseille III, 2004. Français. ⟨tel-00007727⟩

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