Available on ORBi since
16 March 2012
Article (Scientific journals)
Imaging artificial salt water infiltration using electrical resistivity tomography constrained by geostatistical data
Hermans, Thomas  ; Vandenbohede, Alexander; Lebbe, Luc et al.
2012 • In Journal of Hydrology, 438-439, p. 168-180
Peer Reviewed verified by ORBi
 

Files


Full Text
Hermans_et_al_JoH_2012.pdf
Author postprint (1.95 MB)

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
salt water intrusion; resistivity tomography; geostatistical constraint; variogram; inversion; regularization
Abstract :
[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.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Hermans, Thomas ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Vandenbohede, Alexander;  Universiteit Gent - Ugent > Geology and Soil Science > Groundwater modelling
Lebbe, Luc;  Universiteit Gent - Ugent > Geology and Soil Science > Groundwater Modelling
Martin, Roland;  University of Bonn > Geodynamics and Geophysics
Kemna, Andreas;  University of Bonn > Geodynamics and Geophysics
Beaujean, Jean ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Nguyen, Frédéric ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Language :
English
Title :
Imaging artificial salt water infiltration using electrical resistivity tomography constrained by geostatistical data
Alternative titles :
[fr] Imagerie d'une infiltration d'eau salée par tomographie de résistivité électrique contrainte par des données géostatistiques
Publication date :
May 2012
Journal title :
Journal of Hydrology
Publisher :
Elsevier Science
Volume :
438-439
Pages :
168-180
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Commentary :
Selected by Earth Emphasis as special interest to the progress in the Earth Sciences field http://earthemphasis.com/

Statistics


Number of views
225 (68 by ULiège)
Number of downloads
707 (34 by ULiège)

Scopus citations®
 
67
Scopus citations®
without self-citations
47

Bibliography


Similar publications



Contact ORBi