Time-lapse streaming-potential measurement in a sand-box and calculation of streaming potential coupling coefficient

PreviousNext You have accessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2021Time-lapse streaming-potential measurement in a sand-box and calculation of streaming potential coupling coefficientAuthors: Lal MamudCraig HickeyRobert HoltLal MamudNational Center for Physical Acoustics (NCPA), University of MississippiDepartment of Geology and Geological Engineering, University of MississippiSearch for more papers by this author, Craig HickeyNational Center for Physical Acoustics (NCPA), University of MississippiSearch for more papers by this author, and Robert HoltDepartment of Geology and Geological Engineering, University of MississippiSearch for more papers by this authorhttps://doi.org/10.4133/sageep.33-056 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Groundwater flow due to pumping in a phreatic aquifer generates a self-potential (SP) signal at the ground surface which can be used to determine aquifer parameters and direction of groundwater flow. An SP measurement system was assembled using 80 non-polarizing CuSO4 electrodes and an 80-channel high precision logging multi-meter (Keithley 2701) capable of scanning all channels at 8-second interval. The system can automatically log data in spatio-temporal domain. A group of electrode cables and patch cables were made allowing different electrode layouts for field measurement of SP on an earthen dam, over a groundwater pumping or injection site and over a subsurface contamination site. In order to understand the functionality of the SP system, a test box of dimensions 120cm × 120cm × 60cm was built using Plexiglas with a drain at the bottom. The bottom of the box was filled with 2 inches of pea pebbles to facilitate injection and draining from bottom, and the remainder of the box was filled with very coarse to fine grained sand. Electrode placement in the test sandbox was on a 12.33cm × 15.33cm grid. Five observation wells instrumented with high precision pressure transducers and one central pumping well were installed in the tank for hydrogeological investigation. The SP system was checked and verified against a conventional 2 electrode SP system. Time-lapse SP data were recorded using 80 electrodes during a pumping test in the sandbox. In-situ streaming potential coupling coefficient, C (mV/m) were calculated from the collocated observation well and SP electrode data. The intrinsic streaming potential coupling coefficient, C, was measured in the lab using core samples. The in-situ and intrinsic streaming potential coupling coefficient were compared and coupled forward modeling and measured SP data will be discussed. Keywords: time-lapse, groundwater, logging, modeling, aquiferPermalink: https://doi.org/10.4133/sageep.33-056FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2021ISSN (online):1554-8015Copyright: 2021 Pages: 349 publication data© 2021 Published in electronic format with permission by the Society of Exploration Geophysicists and Environment and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 11 Jun 2021 CITATION INFORMATION Lal Mamud, Craig Hickey, and Robert Holt, (2021), "Time-lapse streaming-potential measurement in a sand-box and calculation of streaming potential coupling coefficient," Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 103-103. https://doi.org/10.4133/sageep.33-056 Plain-Language Summary Keywordstime-lapsegroundwaterloggingmodelingaquiferPDF DownloadLoading ...