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Bièvre G., Lacroix Pascal, Oxarango L., Goutaland D., Monnot G., Fargier Y. (2017). Integration of geotechnical and geophysical techniques for the characterization of a small earth-filled canal dyke and the localization of water leakage. Journal of Applied Geophysics, 139, 1-15. ISSN 0926-9851

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Lien direct chez l'éditeur doi:10.1016/j.jappgeo.2017.02.002

Titre
Integration of geotechnical and geophysical techniques for the characterization of a small earth-filled canal dyke and the localization of water leakage
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000399269400001
AuteursBièvre G., Lacroix Pascal, Oxarango L., Goutaland D., Monnot G., Fargier Y.
SourceJournal of Applied Geophysics, 2017, 139, p. 1-15. ISSN 0926-9851
RésuméThis paper investigates the combined use of extensive geotechnical, hydrogeological and geophysical techniques to assess a small earth dyke with a permanent hydraulic head, namely a canal embankment. The experimental site was chosen because of known issues regarding internal erosion and piping phenomena. Two leakages were visually located following the emptying of the canal prior to remediation works. The results showed a good agreement between the geophysical imaging techniques (Electrical Resistivity Tomography, P- and SH-waves Tomography) and the geotechnical data to detect the depth to the bedrock and its lateral variations. It appeared that surface waves might not be fully adapted for dyke investigation because of the particular geometry of the studied dyke, non-respectful of the 10 assumption, and which induced depth and velocity discrepancies retrieved from Rayleigh and Love waves inversion. The use of these classical prospecting techniques however did not allow to directly locate the two leakages within the studied earth dyke. The analysis of ambient vibration time series with a modified beam-forming algorithm allowed to localize the most energetic water flow prior to remediation works. It was not possible to detect the leakage after remediation works, suggesting that they efficiently contributed to significantly reduce the water flow. The second leakage was not detected probably because of a non-turbulent water flow, generating few energetic vibrations.
Plan de classementGéologie et formations superficielles [064] ; Hydrologie [062]
Descr. géo.FRANCE
LocalisationFonds IRD [F B010070011]
Identifiant IRDfdi:010070011
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070011

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