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dc.contributor.authorGanju, Neil K.  Concept link
dc.date.accessioned2011-06-22T14:28:34Z
dc.date.available2011-06-22T14:28:34Z
dc.date.issued2011-06-04
dc.identifier.citationGeophysical Research Letters 38 (2011): L11402en_US
dc.identifier.urihttps://hdl.handle.net/1912/4648
dc.descriptionThis paper is not subject to U.S. copyright. The definitive version was published in Geophysical Research Letters 38 (2011): L11402, doi:10.1029/2011GL047718.en_US
dc.description.abstractCoastal groundwater discharge is an important source of freshwater and nutrients to coastal and estuarine systems. Directly quantifying the spatially integrated discharge of fresh groundwater over a coastline is difficult due to spatial variability and limited observational methods. In this study, I applied a novel approach to estimate net freshwater discharge from a groundwater-fed tidal creek over a spring-neap cycle, with high temporal resolution. Acoustic velocity instruments measured tidal water fluxes while other sensors measured vertical and lateral salinity to estimate cross-sectionally averaged salinity. These measurements were used in a time-dependent version of Knudsen's salt balance calculation to estimate the fresh groundwater contribution to the tidal creek. The time-series of fresh groundwater discharge shows the dependence of fresh groundwater discharge on tidal pumping, and the large difference between monthly mean discharge and instantaneous discharge over shorter timescales. The approach developed here can be implemented over timescales from days to years, in any size estuary with dominant groundwater inputs and well-defined cross-sections. The approach also directly links delivery of groundwater from the watershed with fluxes to the coastal environment.en_US
dc.description.sponsorshipFunding was provided by the USGS Coastal and Marine Geology Program.en_US
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/postscript
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2011GL047718
dc.subjectEstuarine processesen_US
dc.subjectNutrient loadingen_US
dc.subjectSubmarine groundwater dischargeen_US
dc.subjectTidal pumpingen_US
dc.titleA novel approach for direct estimation of fresh groundwater discharge to an estuaryen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2011GL047718


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