Persistent Link:
http://hdl.handle.net/10150/191748
Title:
Solute transport in saturated fractured media
Author:
Rasmussen, Todd Christian.
Issue Date:
1982
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The accidental release of radiochemicals from a repository designed for the storage of high-level radioactive wastes within saturated geologic media is modeled by applying a Discrete-State Compartment (DSC) model to the advection-dispersion (AD) equation. The DSC model is applied to problems concerning matrix diffusion, variable time-dependent sorption and desorption processes, heat transport, and chemical and radioactive decay of radiochemicals. The parameters required for the operation of the DSC model are related to aquifer parameters, such as diffusion, dispersion, heat capacity and the specific heat conductivity. It is shown that by the selection of compartment sizes and an appropriate time step, the DSC solution closely approximates the AD solution. The DSC solution is more powerful than a standard cells-in-series (CIS) solution because variable parameters can be incorporated into the DSC model. A CIS solution allows for only uniform cell attributes and sizes throughout the system. Matrix diffusion is shown to penetrate several metres into a rock matrix when solvent transport is along a fracture. Sorption and desorption of the radiochemicals was modeled by using a thermodynamic equilibrium constant with the option for allowing for transient conditions before equilibrium. The transient condition was modeled using a first-order linear differential equation.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Groundwater flow -- Simulation methods.; Radioisotopes in hydrology.; Radioactive waste disposal in the ground.; Groundwater flow -- Mathematical models.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Simpson, Eugene S.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleSolute transport in saturated fractured mediaen_US
dc.creatorRasmussen, Todd Christian.en_US
dc.contributor.authorRasmussen, Todd Christian.en_US
dc.date.issued1982en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe accidental release of radiochemicals from a repository designed for the storage of high-level radioactive wastes within saturated geologic media is modeled by applying a Discrete-State Compartment (DSC) model to the advection-dispersion (AD) equation. The DSC model is applied to problems concerning matrix diffusion, variable time-dependent sorption and desorption processes, heat transport, and chemical and radioactive decay of radiochemicals. The parameters required for the operation of the DSC model are related to aquifer parameters, such as diffusion, dispersion, heat capacity and the specific heat conductivity. It is shown that by the selection of compartment sizes and an appropriate time step, the DSC solution closely approximates the AD solution. The DSC solution is more powerful than a standard cells-in-series (CIS) solution because variable parameters can be incorporated into the DSC model. A CIS solution allows for only uniform cell attributes and sizes throughout the system. Matrix diffusion is shown to penetrate several metres into a rock matrix when solvent transport is along a fracture. Sorption and desorption of the radiochemicals was modeled by using a thermodynamic equilibrium constant with the option for allowing for transient conditions before equilibrium. The transient condition was modeled using a first-order linear differential equation.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshGroundwater flow -- Simulation methods.en_US
dc.subject.lcshRadioisotopes in hydrology.en_US
dc.subject.lcshRadioactive waste disposal in the ground.en_US
dc.subject.lcshGroundwater flow -- Mathematical models.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairSimpson, Eugene S.en_US
dc.identifier.oclc212891202en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.