HR: 09:00h
AN: H21G-04    [Abstracts]
TI: Sandbox Experiments of Self-Potential Signals Associated With Pumping Tests
AU: * Suski, B
EM: suski@cerege.fr
AF: CEREGE, Europole de l'Arbois, Aix en Provence, 13545 France
AU: Rizzo, E
EM: rizzo@imaa.cnr.it
AF: CNR, C. da S. Loja, Potenza, I-85050 Italy
AU: Revil, A
EM: revil@cerege.fr
AF: CEREGE, Europole de l'Arbois, Aix en Provence, 13545 France
AB: The flow of water in a charged porous material is the source of an electrical field called the self-potential. The origin of this coupling is associated with the drag of the excess of charge contained in the vicinity of the pore water interface by the pore fluid flow. Sandbox experiments were undertaken in order to understand the relationship between self-potential data and the shape of the water table during pumping experiments. The experiments were performed in a thin Plexiglas tank filled with a well-calibrated sand. The electrical potential distribution was measured passively at the top of the tank with a set of 27 Pb/PbCl2 "Petiau" electrodes. During the experiment the piezometric level was measured with a set of 6 piezometers. The results of these pumping tests are the measurements of a detectable electrical field produced at the top surface and analyzed with analytical solutions of the coupled hydroelectric problem.
DE: 5100 PHYSICAL PROPERTIES OF ROCKS
DE: 1832 Groundwater transport
DE: 1894 Instruments and techniques
DE: 0900 EXPLORATION GEOPHYSICS
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting