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Authors: | Revil, A.* Cary, L.* Fan, Q.* Finizola, A.* Trolard, F.* |
Title: | Self-potential signals associated with preferential ground water flow pathways in a buried paleo-channel | Journal: | Geophysical Research Letters | Series/Report no.: | 32(2005) | Publisher: | American Geophysical Union | Issue Date: | 2005 | DOI: | 10.1029/2004GL022124 | URL: | http://www.agu.org/ | Keywords: | Self-potential electrical resistivity tomography hydrogeology tomography |
Subject Classification: | 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy 05. General::05.02. Data dissemination::05.02.04. Hydrogeological data |
Abstract: | The flow of ground water in a buried permeable paleochannel can be observed at the ground surface through its self-potential signature. We apply this method to delineate the Saint-Ferréol paleo-channel of the Rhone River located in Camargue, in the South East of France. Negative potentials, 30 mV (reference taken outside the paleochannel),are associated with ground water flow in this major sand-filled channel (500 m wide). Electrical resistivity is primarily controls by the salinity of the pore water. Electrical resistivity tomography and in situ sampling show the salinity of the water inside the paleo-channel is ten times smaller by comparison with the pore water of the surrounding sediments. Combining electrical resistivity surveys, self-potential data, and a minimum of drilling information, a 3-D reconstruction of the architecture of the paleo-channel is obtained showing the usefulness of this methodology for geomorphological reconstructions in this type of coastal environment. |
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