A finite element analysis of dissolved oxygen drawdown and sulfate production in strip mine spoil dams due to pyritic chemical reaction

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dc.contributor.authorAmend, Joseph Henryen
dc.contributor.committeechairContractor, Dinshaw N.en
dc.contributor.committeememberDesai, C. S.en
dc.contributor.committeememberHunter, J. H.en
dc.contributor.committeememberWiggert, James M.en
dc.contributor.committeememberCostain, John K.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T21:11:10Zen
dc.date.adate2010-05-19en
dc.date.available2014-03-14T21:11:10Zen
dc.date.issued1975-05-06en
dc.date.rdate2010-05-19en
dc.date.sdate2010-05-19en
dc.description.abstractThe problem of dissolved oxygen drawdown and sulfate production in strip mine spoil dams due to chemical reaction between an excess of pyrite, water, and dissolved oxygen is investigated. A finite element analysis is used to solve the diffusion-convection equation assuming steady state conditions and no internal oxygen sources. Oxygen recharge along the free surface is permitted. The analysis is performed in three steps. Step one calculates the nodal piezometric heads and elemental bulk fluid velocities. Steps two and three determine the nodal dissolved oxygen and sulfate concentrations. Solutions are presented for a wide range of soil permeabilities and dissolved oxygen reaction coefficients. It is found that as the dissolved oxygen reaction coefficients. decreased, the dissolved oxygen deficit decreased and the sulfate concentration increased. From these results it was found that the maximum dissolved oxygen deficit occurs at an internal point in the dam and the maximum sulfate concentration occurs on the downstream face of the dam. The computer program used in the analysis is written in FORTRMi IV computer language and requires a minimum of programming knowledge to implement.en
dc.description.degreePh. D.en
dc.format.extentviii, 113 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-05192010-020323en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05192010-020323/en
dc.identifier.urihttp://hdl.handle.net/10919/37839en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1975.A47.pdfen
dc.relation.isformatofOCLC# 40145556en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectoxygenen
dc.subjectsoil permeabilitiesen
dc.subjectsulfateen
dc.subject.lccLD5655.V856 1975.A47en
dc.titleA finite element analysis of dissolved oxygen drawdown and sulfate production in strip mine spoil dams due to pyritic chemical reactionen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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