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Detailed Reference Information |
Revil, A., Cary, L., Fan, Q., Finizola, A. and Trolard, F. (2005). Self-potential signals associated with preferential ground water flow pathways in a buried paleo-channel. Geophysical Research Letters 32: doi: 10.1029/2004GL022124. issn: 0094-8276. |
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The flow of ground water in a buried permeable paleo-channel can be observed at the ground surface through its self-potential signature. We apply this method to delineate the Saint-Ferr¿ol paleo-channel of the Rhone River located in Camargue, in the South East of France. Negative potentials, ~-30 mV (reference taken outside the paleo-channel), 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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Abstract |
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Keywords
Physical Properties of Rocks, Magnetic and electrical properties, Hydrology, Rocks, physical properties, Hydrology, River channels (0483, 0744), Hydrology, Groundwater transport, Physical Properties of Rocks, Transport properties |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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