Reference : Imaging artificial salt water infiltration using electrical resistivity tomography const...
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/114637
Imaging artificial salt water infiltration using electrical resistivity tomography constrained by geostatistical data
English
[fr] Imagerie d'une infiltration d'eau salée par tomographie de résistivité électrique contrainte par des données géostatistiques
Hermans, Thomas mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
Vandenbohede, Alexander mailto [Universiteit Gent - Ugent > Geology and Soil Science > Groundwater modelling > >]
Lebbe, Luc mailto [Universiteit Gent - Ugent > Geology and Soil Science > Groundwater Modelling > >]
Martin, Roland mailto [University of Bonn > Geodynamics and Geophysics > > >]
Kemna, Andreas mailto [University of Bonn > Geodynamics and Geophysics > > >]
Beaujean, Jean mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
Nguyen, Frédéric mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
May-2012
Journal of Hydrology
Elsevier Science
438-439
168-180
Yes (verified by ORBi)
International
0022-1694
[en] salt water intrusion ; resistivity tomography ; geostatistical constraint ; variogram ; inversion ; regularization
[en] Electrical resistivity tomography is a well-known technique to monitor fresh-salt water transitions. In such environments, boreholes are often used to validate geophysical results but rarely used to constrain the geoelectrical inversion. To estimate the extent of salt water infiltration in the dune area of a Natural Reserve (Westhoek, Belgium), electrical resistivity tomography profiles were carried out together with borehole electromagnetic measurements. The latter were used to calculate a vertical variogram, representative of the study site. Then, a geostatistical constraint, in the form of an a priori model covariance matrix based on the variogram, was imposed as regularization to solve the electrical inverse problem. Inversion results enabled to determine the extension of the salt water plume laterally and at depth, but also to estimate the total dissolved solid content within the plume. These results are in agreement with the hydrogeological data of the site. A comparison with borehole data showed that the inversion results with geostatistical constraints are much more representative of the seawater body (in terms of total dissolved solids, extension and height) than results using standard smoothness-constrained inversion. The field results obtained for the Westhoek site emphasize the need to go beyond standard smoothness-constrained images and to use available borehole data as prior information to constrain the inversion.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/114637
10.1016/j.jhydrol.2012.03.021
Selected by Earth Emphasis as special interest to the progress in the Earth Sciences field http://earthemphasis.com/

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