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Hydrol. Earth Syst. Sci., 22, 159-170, 2018
https://doi.org/10.5194/hess-22-159-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
10 Jan 2018
Multiconfiguration electromagnetic induction survey for paleochannel internal structure imaging: a case study in the alluvial plain of the River Seine, France
Fayçal Rejiba1,a, Cyril Schamper1, Antoine Chevalier1, Benoit Deleplancque2, Gaghik Hovhannissian3, Julien Thiesson1, and Pierre Weill4 1Sorbonne Université – UPMC Univ Paris 06, CNRS, UMR 7619 METIS, Paris, France
2UMR CNRS 7423 – Ecole Polytechnique de l'Université François Rabelais de Tours, 35 allée Ferdinand de Lesseps, 37200 Tours, France
3North Delegation of the Institute of Research for Development (IRD), UMR 242 iEES Paris (Institute of Ecology and Environmental Sciences), IRD/CNRS/UPMC/INRA/UPEC/Univ. Paris Diderot, 32 av. H. Varagnat, 93143 Bondy, France
4Normandie Univ, UNICAEN, UNIROUEN CNRS, Morphodynamique Continentale et Côtière, 14000 Caen, France
anow at: Normandie Univ, UNICAEN, UNIROUEN CNRS, Morphodynamique Continentale et Côtière, 14000 Caen, France
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.

Citation: Rejiba, F., Schamper, C., Chevalier, A., Deleplancque, B., Hovhannissian, G., Thiesson, J., and Weill, P.: Multiconfiguration electromagnetic induction survey for paleochannel internal structure imaging: a case study in the alluvial plain of the River Seine, France, Hydrol. Earth Syst. Sci., 22, 159-170, https://doi.org/10.5194/hess-22-159-2018, 2018.
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Short summary
The internal variability of paleomeanders strongly influence water fluxes in alluvial plains. This study presents the results of a hydrogeophysical investigation that provide a very detailed characterization of the geometry of a wide paleomeander. The presented case study, situated in the Seine River basin (France), represents a common sedimentary and geomorphological structure in alluvial plains worldwide.
The internal variability of paleomeanders strongly influence water fluxes in alluvial plains....
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