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- W2322098981 abstract "PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2013GROUND-TRUTHING ELECTRICAL RESISTIVITY METHODS IN SUPPORT OF SUBMARINE GROUNDWATER DISCHARGE STUDIES: EXAMPLES FROM HAWAII, WASHINGTON, AND CALIFORNIAAuthors: Cordell D. JohnsonPeter W. SwarzenskiChristina M. RichardsonChris G. SmithKevin D. KreogerPriya M. GanguliCordell D. Johnson U.S. Geological Survey, Santa Cruz, CA and UC Santa Cruz, Santa Cruz, CASearch for more papers by this author, Peter W. Swarzenski U.S. Geological Survey, Santa Cruz, CASearch for more papers by this author, Christina M. Richardson U.S. Geological Survey, Santa Cruz, CA and UC Santa Cruz, Santa Cruz, CASearch for more papers by this author, Chris G. Smith U.S. Geological Survey, St. Petersburg, FLSearch for more papers by this author, Kevin D. Kreoger U.S. Geological Survey, Woods Hole, MASearch for more papers by this author, and Priya M. Ganguli UC Santa Cruz, Santa Cruz, CASearch for more papers by this authorhttps://doi.org/10.4133/sageep2013-067.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Submarine groundwater discharge (SGD) is an important conduit that links terrestrial and marine environments. SGD conveys both water and water-borne constituents into coastal waters, where these inflows may impact nearshore ecosystem health and sustainability. Multi-channel electrical resistivity techniques have proven to be a powerful new tool to examine scales and dynamics of SGD and SGD forcings. However, there are caveats that must be addressed when resistivity methods are utilized in estuarine or marine environments. These issues most often relate to discerning subtle nuances in the flow of electricity through variably saturated media that can also be highly conductive (i.e., seawater). Three contrasting field sites were examined to better constrain resistivity techniques with site-specific ground-truthing that involved concurrent depth profiling of salinity (and resistivity), probing for the bedrock depths, assessing inherent rock/sediment electrical resistance, and fine-tuning inversion methods. The three study sites all have substantial (up to 85 cm day−1) SGD, but the underlying geology and physical drivers of SGD are site specific. At a site in Pelekane Bay, Hawaii, episodic sedimentation and poor coastal circulation has resulted in unusual lithologic patterns. At a site in Hood Canal, a fjord within Puget Sound, WA, SGD is the result of a large tidal range, abundant recharge, and steep hydrologic gradients. At Younger Lagoon, in northern California, the flow of groundwater towards the coast is much more parsimonious, but SGD-associated biogeochemical transformations here may be that much more important. Based on rigorous ground-truthing at each field site, multi-channel resistivity techniques can reproduce the scales and dynamics of a seepage field if the data are properly collected and if the inversions are tuned to field site characteristics. Such information can provide a truly unique perspective on the scales and dynamics of SGD - information essential to scientists and resource managers alike. Permalink: https://doi.org/10.4133/sageep2013-067.1FiguresReferencesRelatedDetails 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 Cordell D. Johnson, Peter W. Swarzenski, Christina M. Richardson, Chris G. Smith, Kevin D. Kreoger, and Priya M. Ganguli, (2013), GROUND-TRUTHING ELECTRICAL RESISTIVITY METHODS IN SUPPORT OF SUBMARINE GROUNDWATER DISCHARGE STUDIES: EXAMPLES FROM HAWAII, WASHINGTON, AND CALIFORNIA, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 201-211. https://doi.org/10.4133/sageep2013-067.1 Plain-Language Summary PDF DownloadLoading ..." @default.
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- W2322098981 title "GROUND-TRUTHING ELECTRICAL RESISTIVITY METHODS IN SUPPORT OF SUBMARINE GROUNDWATER DISCHARGE STUDIES: EXAMPLES FROM HAWAII, WASHINGTON, AND CALIFORNIA" @default.
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