Multiconfiguration electromagnetic induction survey for paleochannel internal structure imaging: a case study in the alluvial plain of the River Seine, France
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Published:2018-01-10
Issue:1
Volume:22
Page:159-170
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Rejiba Fayçal, Schamper Cyril, Chevalier Antoine, Deleplancque Benoit, Hovhannissian GaghikORCID, Thiesson Julien, Weill PierreORCID
Abstract
Abstract. The La Bassée floodplain area is a large groundwater reservoir
controlling most of the water exchanged between local aquifers and
hydrographic networks within the Seine River basin (France). Preferential
flows depend essentially on the heterogeneity of alluvial plain infilling,
whose characteristics are strongly influenced by the presence of mud plugs
(paleomeander clayey infilling). These mud plugs strongly contrast with the
coarse sand material that composes most of the alluvial plain, and can create
permeability barriers to groundwater flows. A detailed knowledge of the
global and internal geometry of such paleomeanders can thus lead to a
comprehensive understanding of the long-term hydrogeological processes of the
alluvial plain. A geophysical survey based on the use of electromagnetic
induction was performed on a wide paleomeander, situated close to the city of
Nogent-sur-Seine in France. In the present study we assess the advantages of
combining several spatial offsets, together with both vertical and horizontal
dipole orientations (six apparent conductivities), thereby mapping not only the
spatial distribution of the paleomeander derived from lidar data but also
its vertical extent and internal variability.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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