The development of a conceptual model to describe the occurrence of brackish water in the Edwards Aquifer, South-Central Texas

dc.contributor.advisorGao, Yongli
dc.contributor.advisorDutton, Alan
dc.contributor.authorHoff, Stephen Zane, Jr.
dc.contributor.committeeMemberYoung, David
dc.contributor.committeeMemberGodet, Alexis
dc.date.accessioned2024-02-09T22:25:23Z
dc.date.available2024-02-09T22:25:23Z
dc.date.issued2016
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractBrackish water of the Edwards aquifer, south-central Texas, occurs in a zone of convergent mixing primarily between hydropressured freshwater moving downdip by gravity and deep brine migrating updip through geopressure drive. The convergence between flow regimes in the Edwards Group is documented through composite maps of (1) the potentiometric surface drawn from hydraulic-head data from the freshwater aquifer and pressure data from downdip oil and gas wells, and (2) total dissolved solids (TDS) using groundwater and petroleum industry data sets. TDS data from the petroleum industry data set includes both analyses of chemical composition of water samples from production wells and estimates of TDS derived from geophysical logs. A hydraulic-head minimum, located at a reversal in lateral gradient in hydraulic head, and a 3x steepening of the salinity gradient characterize the zone of convergence. The likely source of geopressure in the Edwards Group is fluid leakage from geopressured Cenozoic sections which overlie the Edwards Group beyond the Cretaceous ancestral shelf margin.
dc.description.departmentGeosciences
dc.format.extent77 pages
dc.format.mimetypeapplication/pdf
dc.identifier.isbn9781369061284
dc.identifier.urihttps://hdl.handle.net/20.500.12588/4004
dc.languageen
dc.subjectAquifer
dc.subjectBrackish
dc.subjectConvergence
dc.subjectEdwards
dc.subjectGeopressure
dc.subjectMixing
dc.subject.classificationHydrologic sciences
dc.subject.classificationGeology
dc.subject.classificationGeochemistry
dc.subject.lcshBrackish waters -- Texas -- Edwards Aquifer
dc.subject.lcshGroundwater flow -- Texas -- Edwards Aquifer
dc.subject.lcshEdwards Aquifer (Tex.)
dc.titleThe development of a conceptual model to describe the occurrence of brackish water in the Edwards Aquifer, South-Central Texas
dc.typeThesis
dc.type.dcmiText
dcterms.accessRightspq_closed
thesis.degree.departmentGeosciences
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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