Assessing the Hydrogeological Properties Influencing Nitrate Distribution in a Shallow Unconfined Dolostone Aquifer and Supply Well Vulnerability

dc.contributor.advisorParker, Beth
dc.contributor.authorHommersen, James
dc.date.accessioned2021-01-18T21:26:30Z
dc.date.available2021-01-18T21:26:30Z
dc.date.copyright2021-01
dc.date.created2020-11-06
dc.degree.departmentSchool of Environmental Sciencesen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmeEnvironmental Sciencesen_US
dc.description.abstractThis study investigated an aquifer system in Halton Hills, Ontario, Canada where elevated concentrations of nitrate (NO3-) were detected in two municipal water supply wells since 2007. An investigation core hole was drilled 20 m from the supply wells following the Discrete Fracture Network-Matrix (DFN-M) field approach to evaluate local hydrogeologic conditions and vertical extent of NO3- in the bedrock. Quarterly groundwater sampling allowed for assessing the spatio-temporal hydrochemistry variability and isotope analysis provided insight on rates of denitrification and flow path distinction. Hydraulic testing on the multilevel system (MLS) required a novel setup and mathematical development to address friction and acceleration losses for unsteady oscillatory annular flow conditions to obtain transmissivity (T) estimates. This study expands upon the understanding of the local hydrogeologic flow system in comparison to the existing equivalent porous media (EPM) based regional conceptual site model (CSM) and presents a methodology for obtaining improved T estimates.en_US
dc.description.sponsorshipRegional Municipality of Halton
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada Senior Industrial Research Chair Grant (No. IRCPJ 363783-11)
dc.identifier.urihttps://hdl.handle.net/10214/23766
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rightsAttribution 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.subjectNitrateen_US
dc.subjectGroundwateren_US
dc.subjectSlug Testingen_US
dc.subjectFriction and Inertial Lossesen_US
dc.subjectUnsteady and Steady Flowen_US
dc.subjectAnnular Flowen_US
dc.subjectMultilevel Systemen_US
dc.subjectFractured Bedrocken_US
dc.subjectTransmissivityen_US
dc.subjectGUDIen_US
dc.titleAssessing the Hydrogeological Properties Influencing Nitrate Distribution in a Shallow Unconfined Dolostone Aquifer and Supply Well Vulnerabilityen_US
dc.typeThesisen_US

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