HR: 14:25h
AN: H12H-04 INVITED     [PDF]
TI: Geoelectrical Methods Applied to Contaminant Plumes. From Laboratory to Field Investigations
AU: * Revil, A
EM: revil@cerege.fr
AF: CNRS-CEREGE, BP 80, Cedex 4, Aix-en-Provence, 13 13545 France
AU: Naudet, V
EM: naudet@cerege.fr
AF: CNRS-CEREGE, BP 80, Cedex 4, Aix-en-Provence, 13 13545 France
AU: Suski, B
EM: suski@cerege.fr
AF: CNRS-CEREGE, BP 80, Cedex 4, Aix-en-Provence, 13 13545 France
AU: Rizzo, E
EM: rizzo@cerege.fr
AF: CNRS-CEREGE, BP 80, Cedex 4, Aix-en-Provence, 13 13545 France
AU: Bezis, S
EM: sebastien.bezis@tiscali.fr
AF: CNRS-CEREGE, BP 80, Cedex 4, Aix-en-Provence, 13 13545 France
AB: At present, the self-potential method, a relatively cheap field method, is rarely used in environmental investigations due to the lack of reliable interpretation schemes and poor knowledge of the signal-to-noise ratio. The self-potential signals measured at the ground surface with a new generation of non-polarisable electrodes represent the ground signature of in situ polarization mechanisms. Two main driving mechanisms have been evidenced. The first is the electrokinetic response associated with ground water flow. The second contribution is associated with redox conditions in the ground. In this talk, we will present a set of new data for these two mechanisms. These data include core measurements, measurements in plexiglas tanks filled with porous sands, and finally a field experiment. The field investigation is related to the detection of a contaminant plume through a combination of electrical resistivity tomographies and self-potential investigations. We show how laboratory experiments are helpful to determine redox conditions in the contaminant plume and we will discuss the principle of electro-redox geobatteries including the role of biofilm of bacteria.
DE: 0925 Magnetic and electrical methods
DE: 1832 Groundwater transport
DE: 5109 Magnetic and electrical properties
DE: 5114 Permeability and porosity
DE: 5139 Transport properties
SC: Hydrology [H]
MN: 2003 Fall Meeting