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dc.contributor.advisorSchulte, Mitchell Darineng
dc.contributor.authorPagan, Steveneng
dc.coverage.spatialMissouri -- Boone Countyeng
dc.date.issued2009eng
dc.date.submitted2009 Springeng
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.eng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on November 20, 2009).eng
dc.descriptionThesis advisor: Dr. Mitchell Schulte.eng
dc.descriptionM.S. University of Missouri--Columbia 2009.eng
dc.description.abstractAlthough the claypan of North Central Missouri is traditionally believed to protect the groundwater from contamination, low concentrations of the herbicide atrazine have been detected in a shallow glacial till aquifer. The fate of the atrazine in the aquifer is not well known. With the continued use of atrazine, the concentration in the aquifer could increase to levels of concern or decrease if the conditions are not favorable for persistence. Beginning in the Fall 2007 and continuing through the Fall 2008, concentrations of atrazine and its degradation products deethylatrazine (DEA) and deisopropylatrazine (DIA) were measured at a typical field in Northeast Boone County, Missouri. The concentration ratio of DEA to atrazine (DAR) supports the concept that preferential flow paths within the claypan allow for direct transport of atrazine to the aquifer. These data were also necessary for constructing computer based flow models of the aquifer. Using the programs MODFLOW and MT3DMS within GMS 6.0, a groundwater flow model was produced that was coupled with a solute transport model of atrazine within the saturated zone. The model was constructed using constraints of historical use of atrazine since 1991. The model results were similar to those measured in the field and predictive simulations did not indicate an increase of atrazine concentration to alarming levels.eng
dc.description.bibrefIncludes bibliographical references.eng
dc.format.extentviii, 85 pageseng
dc.identifier.merlinb73161676eng
dc.identifier.oclc467922579eng
dc.identifier.urihttps://doi.org/10.32469/10355/6578eng
dc.identifier.urihttps://hdl.handle.net/10355/6578
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2009 Theseseng
dc.rightsOpenAccess.eng
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
dc.subject.lcshDrift -- Missourieng
dc.subject.lcshGroundwater -- Pollutioneng
dc.subject.lcshGroundwater flow -- Mathematical modelseng
dc.subject.lcshHerbicides -- Environmental aspectseng
dc.subject.lcshClaypan soilseng
dc.titleAtrazine transport through a glacial till aquifer in north-central Missourieng
dc.typeThesiseng
thesis.degree.disciplineGeological sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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