Use of gamma-ray geotomography to measure dry bulk density and unsaturated flow through tuff

Persistent Link:
http://hdl.handle.net/10150/191995
Title:
Use of gamma-ray geotomography to measure dry bulk density and unsaturated flow through tuff
Author:
Goering, Timothy James,1961-
Issue Date:
1988
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:
Gamma-ray geotomography was used to measure the dry bulk density and porosity distributions in two cores of slightly-welded tuff. The cores were then subjected to a point or non-point source of water, and water movement through the cores was observed using tomography. Three numerical methods, the Algebraic Reconstruction Technique (ART), modified ART, and Singular Value Decomposition (SVD) were used to reconstruct the tomographs, and SVD was found to be superior for the simple tomographs of this study. Several tomographic models were used to determine the maximum image resolution from a given set of data. The effects of increasing the number of gamma-ray measurements on resolution were also studied. Finally, the tomographs were compared with laboratory measurements for validation. The tomographically predicted dry bulk density distributions were similar to the measured dry bulk density distributions within each core. However, the percent saturation tomographs were found to be inaccurate when water was rapidly moving through the cores because of the considerable time required to obtain the numerous gamma-ray attenuation measurements.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Seismic tomography.; Volcanic ash, tuff, etc. -- Moisture -- Measurement.; Groundwater flow.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Evans, Daniel D.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleUse of gamma-ray geotomography to measure dry bulk density and unsaturated flow through tuffen_US
dc.creatorGoering, Timothy James,1961-en_US
dc.contributor.authorGoering, Timothy James,1961-en_US
dc.date.issued1988en_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.abstractGamma-ray geotomography was used to measure the dry bulk density and porosity distributions in two cores of slightly-welded tuff. The cores were then subjected to a point or non-point source of water, and water movement through the cores was observed using tomography. Three numerical methods, the Algebraic Reconstruction Technique (ART), modified ART, and Singular Value Decomposition (SVD) were used to reconstruct the tomographs, and SVD was found to be superior for the simple tomographs of this study. Several tomographic models were used to determine the maximum image resolution from a given set of data. The effects of increasing the number of gamma-ray measurements on resolution were also studied. Finally, the tomographs were compared with laboratory measurements for validation. The tomographically predicted dry bulk density distributions were similar to the measured dry bulk density distributions within each core. However, the percent saturation tomographs were found to be inaccurate when water was rapidly moving through the cores because of the considerable time required to obtain the numerous gamma-ray attenuation measurements.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshSeismic tomography.en_US
dc.subject.lcshVolcanic ash, tuff, etc. -- Moisture -- Measurement.en_US
dc.subject.lcshGroundwater flow.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.chairEvans, Daniel D.en_US
dc.identifier.oclc213331609en_US
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