HR: 16:15h
AN: H24C-02    [Abstracts]
TI: Monitoring of an Infiltration Experiment Using the Self-Potential Method
AU: * Suski, B
EM: suski@cerege.fr
AF: CNRS-CEREGE, Europole de l'Arbois BP 80, Aix en Provence, 13545 France
AU: Revil, A
EM: revil@cerege.fr
AF: CNRS-CEREGE, Europole de l'Arbois BP 80, Aix en Provence, 13545 France
AU: Boleve, A
EM: boleve@cerege.fr
AF: CNRS-CEREGE, Europole de l'Arbois BP 80, Aix en Provence, 13545 France
AU: Titov, K
EM: tito@KT4096.spb.edu
AF: University of Saint Petersbourg, Geological Faculty 7-9 Universitetskaya nab., St Petersbourg, 199034 Russian Federation
AU: Konosavsky, P
EM: konosavsky@mail15.com
AF: Institute of Environmental Geology of Russian Academy of Sciences, 29 (14th) Liniya, St Petersbourg, 199178 Russian Federation
AU: Voltz, M
EM: voltz@ensam.inra.fr
AF: INRA, Laboratoire d'‚tude des Int‚ractions entre Sol, AgrosystŠme et HydrosystŠme 2 place Viala, Montpellier, 34060 France
AU: Dages, C
EM: dages@ensam.inra.fr
AF: INRA, Laboratoire d'‚tude des Int‚ractions entre Sol, AgrosystŠme et HydrosystŠme 2 place Viala, Montpellier, 34060 France
AU: Huttel, O
EM: huttel@ensam.inra.fr
AF: INRA, Laboratoire d'‚tude des Int‚ractions entre Sol, AgrosystŠme et HydrosystŠme 2 place Viala, Montpellier, 34060 France
AB: The flow of ground water in a porous soil generates an electrical field which can be measured at the ground surface with a set of non-polarizable electrodes connected to a multimeter. These so-called self-potential signals can be used to determine the pattern of the ground water flow in the subsurface. A field experiment was carried out to monitor the piezometric level and the dynamics of self-potential signals during a water infiltration test from a ditch using a set of 18 piezometers and a network of 41 (Pb/PbCl2) non-polarizable electrodes placed at the ground surface. The variations of the self-potential signals and the piezometric levels are linearly correlated with an apparent coupling coefficient of -5.5 +/- 0.9 mV.m-1. The intrinsic streaming potential coupling coefficient, measured on soil samples extracted from the test site, is in the range -4.0 to -5.9 mV.m-1 depending on the conductivity of the pore water. The hydraulic heads and the self-potential signals are jointly modelled using the 2D-finite-difference software GWFGEM (Ground Water Flow Geo-Electrical Mapping). This model reproduces fairly well the observed results with independent evaluation of the material properties entering the field equations. These results show the ability of the self-potential method to monitor ground water flow in a non-intrusive way.
DE: 1829 Groundwater hydrology
DE: 1832 Groundwater transport
DE: 1866 Soil moisture
DE: 1875 Vadose zone
DE: 1884 Water supply
SC: Hydrology [H]
MN: Fall Meeting 2005