Gloaguen, Erwan; Lefebvre, René; Ballard, Jean-Marc; Paradis, Daniel; Tremblay, Laurie et Michaud, Yves (2012). Inference of the two dimensional GPR velocity field using collocated cokriging of Direct Push permittivity and conductivity logs and GPR profiles. Journal of Applied Geophysics , vol. 78 . pp. 94-101. DOI: 10.1016/j.jappgeo.2011.10.015.
Ce document n'est pas hébergé sur EspaceINRS.Résumé
One of the main difficulties in processing GPR surface data is to infer the ground velocity models in order to convert the radargram time scale into depth. Common conversion techniques usually fail if the ground lithology is complex. Consequently, the ground velocity has to be guessed and generally assumed laterally invariant. In this paper, we present a new geostatistical approach to the velocity analysis of sandy aquifer based on the interpolation of the Direct Push relative permittivity and conductivity logs. The first step of the method consists in scaling the radargram to maximize the correlation with the logs. Then, collocated cokriging of electrical relative permittivity and conductivity and the scaled radargram information is computed. The cokriged fields are converted in velocity field following EM hypothesis and the time to depth conversion of the original radargram is then applied using the inferred velocity field. Results on real data analysis show that the method works well in fairly homogeneous sandy aquifer with intercalated dipping thin silt layers.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | CPT; geostatistics; GPR; multivariate analysis |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 19 oct. 2018 14:15 |
| Dernière modification: | 19 oct. 2018 14:15 |
| URI: | https://espace.inrs.ca/id/eprint/7245 |
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