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Using electrical resistivity tomography to calibrate seawater intrusion models along the Alabama Gulf Coast

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dc.contributorZheng, Chunmiao
dc.contributorTick, Geoffrey R.
dc.contributorAnderson, Neil
dc.contributor.advisorDimova, Natasha T.
dc.contributor.authorCoburn, Nathan L.
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2017-03-01T17:23:04Z
dc.date.available2017-03-01T17:23:04Z
dc.date.issued2014
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractNumerical models (e.g., MODFLOW/SEAWAT) are commonly used to quantify the extent and magnitude of seawater intrusion (SI). Since coastal communities must account for SI into local aquifers, numerical models can be an effective planning and management tool as coastal populations increase. While these models tend to be limited by the availability of hydrological data, uncertainty in these results can be substantially reduced through the integration of field geophysical measurements. Field measurements employing electrical resistivity tomography (ERT) were utilized to calibrate a density-dependent groundwater flow model for Gulf Shores, Alabama. Specifically, six independent ERT profiles were produced within a modeled area adjacent to a shallow lake and along the near-shore boundary. The ERT methods were employed to a depth of 95 meters, encapsulating two aquifer systems with previously identified SI concerns (Chandler et al, 1986; Murgulet and Tick, 2008). Results from the ERT deployments were compared to previously developed models' near shore density boundary constructed from local borehole data, then utilized to calibrate the model freshwater/saltwater mixing zone. Other geophysical investigations employing similar methodology (e.g. Time-Domain Electromagnetics) have been used to calibrate SI models and to explore the extent of SI in a number of coastal regions. This study expands upon previous research through the integration of a 3-D groundwater flow model with greater resolution ERT measurements to more accurately determine the extent of SI, and delineate the near shore freshwater/seawater boundary zone.en_US
dc.format.extent129 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0001888
dc.identifier.otherCoburn_alatus_0004M_12207
dc.identifier.urihttps://ir.ua.edu/handle/123456789/2318
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectGeology
dc.subjectGeophysics
dc.subjectHydrologic sciences
dc.titleUsing electrical resistivity tomography to calibrate seawater intrusion models along the Alabama Gulf Coasten_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Geological Sciences
etdms.degree.disciplineGeology
etdms.degree.grantorThe University of Alabama
etdms.degree.levelmaster's
etdms.degree.nameM.S.

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