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- W2317528420 abstract "PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2008Characterizing Submarine Ground‐Water Discharge Using Fiber‐Optic Distributed Temperature Sensing and Marine Electrical ResistivityAuthors: Rory D. HendersonFrederick D. Day‐LewisJohn W. LaneCharles F. HarveyLanbo LiuRory D. HendersonU.S. Geological Survey, Storrs, CT and University of Connecticut, Storrs, CTSearch for more papers by this author, Frederick D. Day‐LewisU.S. Geological Survey, Storrs, CTSearch for more papers by this author, John W. LaneU.S. Geological Survey, Storrs, CTSearch for more papers by this author, Charles F. HarveyMassachusetts Institute of Technology, Cambridge, MASearch for more papers by this author, and Lanbo LiuUniversity of Connecticut, Storrs, CTSearch for more papers by this authorhttps://doi.org/10.4133/1.2963319 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Submarine ground‐water discharge (SGD) contributes important solute fluxes to coastal waters. Pollutants are transported to coastal ecosystems by SGD at spatially and temporally variable rates. New approaches are needed to characterize the effects of storm‐event, tidal, and seasonal forcing on SGD. Here, we evaluate the utility of two geophysical methods‐fiber‐optic distributed temperature sensing (FO‐DTS) and marine electrical resistivity (MER)—for observing the spatial and temporal variations in SGD and the configuration of the freshwater/saltwater interface within submarine sediments. FO‐DTS and MER cables were permanently installed into the estuary floor on a transect extending 50 meters offshore under Waquoit Bay, Massachusetts, at the Waquoit Bay National Estuarine Research Reserve, and nearly continuous data were collected for 4 weeks in summer 2007. Initial results indicate that the methods are extremely useful for monitoring changes in the complex estuarine environment. The FO‐DTS produced time‐series data at approximately 1‐meter increments along the length of the fiber at approximately 29‐second intervals. The temperature time‐series data show that the temperature at near‐shore locations appears to be dominated by a semi‐diurnal (tidal) signal, whereas the temperature at off‐shore locations is dominated by a diurnal signal (day/night heating and cooling). Dipole‐dipole MER surveys were completed about every 50 minutes, allowing for production of high‐resolution time‐lapse tomograms, which provide insight into the variations of the subsurface freshwater/saltwater interface. Preliminary results from the MER data show a high‐resistivity zone near the shore at low tide, indicative of SGD, and consistent with the FO‐DTS results.Permalink: https://doi.org/10.4133/1.2963319FiguresReferencesRelatedDetailsCited ByTidal frequencies and quasiperiodic subsurface water level variations dominate redox dynamics in a salt marsh system25 May 2022 | Hydrological Processes, Vol. 36, No. 5Utilizing multichannel electrical resistivity methods to examine the contributions of submarine groundwater discharges14 May 2020 | Marine Georesources & Geotechnology, Vol. 39, No. 7A case study of freshwater discharge in porous calcarenite formation in coastal terrace at Manapad, South India13 October 2020 | Carbonates and Evaporites, Vol. 35, No. 4Environmental temperature sensing using Raman spectra DTS fiber-optic methods28 January 2009 | Water Resources Research, Vol. 45, No. 4 Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008ISSN (online):1554-8015Copyright: 2008 Pages: 1427 publication data© 2008 Copyright © 2008 The Environmental and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 30 Sep 2008 CITATION INFORMATION Rory D. Henderson, Frederick D. Day‐Lewis, John W. Lane, Jr., Charles F. Harvey, and Lanbo Liu, (2008), Characterizing Submarine Ground‐Water Discharge Using Fiber‐Optic Distributed Temperature Sensing and Marine Electrical Resistivity, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 775-785. https://doi.org/10.4133/1.2963319 Plain-Language Summary PDF DownloadLoading ..." @default.
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- W2317528420 title "Characterizing Submarine Ground‐Water Discharge Using Fiber‐Optic Distributed Temperature Sensing and Marine Electrical Resistivity" @default.
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