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• W2332933903 abstract "PreviousNext You have accessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2013SEEPAGE AT LES CÈDRES EMBANKMENT DAM (PART 1): SP/ERT SURVEYS AND TEMPERATURE MONITORINGAuthors: Michel ChouteauAbderrezak BoucheddaMathilde LargetPatrice RivardAlain CôtéKaveh SalehMohamed HamoniMichel Chouteau Ecole Polytechnique;Search for more papers by this author, Abderrezak Bouchedda Université de Sherbrooke;Search for more papers by this author, Mathilde Larget Université de Sherbrooke;Search for more papers by this author, Patrice Rivard Université de Sherbrooke;Search for more papers by this author, Alain Côté IREQSearch for more papers by this author, Kaveh Saleh IREQSearch for more papers by this author, and Mohamed Hamoni Université de Sherbrooke;Search for more papers by this authorhttps://doi.org/10.4133/sageep2013-151.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Les Cèdres is an embankment dam that guides water from a channel of the St-Lawrence River to a power plant. The 1917-old dam has been plagued with seepage for many years. Water leakage can be observed at dam toe at a few places. Hydro-Quebec, the dam owner and operator, uses the dam to evaluate non-destructive methods that could be employed to detect seepage and assess remediation work. It needs good knowledge of where water flow within the dam to plan an effective grouting program in order to stop seepage. As water flowing through preferential paths can cause streaming potentials and changes in the dam material resistivity and temperature, Self Potential (SP) surveys were carried out along with Electrical Resistance Tomography (ERT) surveys and passive temperature measurements in an existing well through the embankment centered over the perturbed area. The water level in the reservoir on the downstream side of the dam was raised by 5 m during the survey. Therefore, SP surveys were carried out before, during and after the water level raise. SP was also continuously monitored to track any changes possibly induced by pressure and flow rate changes during the impounding. Laboratory measurements of the electrokinetic coupling coefficient were done on material from the dam. The SP maps processed at the three stages show complex structure. However, we observe changes with time/water level rise. The 3D resistivity model of the dam as interpreted from ERT shows that the impervious clay layer on the topside is discontinuous; those discontinuities can promote water infiltration. The vertical temperature profile with time shows that most of the changes in the first 6 m are caused by advection and by conduction in the deepest part. Possible water seepage at a depth of 6m is consistent with changes in soil composition at that depth and particular location. The measured coupling coefficient is in general agreement with published data. The geophysical data indicates complex seepage paths controlled by several sources and internal structure. Permalink: https://doi.org/10.4133/sageep2013-151.1FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2013ISSN (online):1554-8015Copyright: 2013 Pages: 821 publication data© 2013 Published in electronic format with permission by the Environment and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 28 May 2013 CITATION INFORMATION Michel Chouteau, Abderrezak Bouchedda, Mathilde Larget, Patrice Rivard, Alain Côté, Kaveh Saleh, and Mohamed Hamoni, (2013), SEEPAGE AT LES CÈDRES EMBANKMENT DAM (PART 1): SP/ERT SURVEYS AND TEMPERATURE MONITORING, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 709-709. https://doi.org/10.4133/sageep2013-151.1 Plain-Language Summary PDF DownloadLoading ..." @default.
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• W2332933903 title "SEEPAGE AT LES CÈDRES EMBANKMENT DAM (PART 1): SP/ERT SURVEYS AND TEMPERATURE MONITORING" @default.
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