Persistent Link:
http://hdl.handle.net/10150/191927
Title:
Measurement of unsaturated rock water potentials in situ
Author:
Anderson, Ingrid Christine,1959-
Issue Date:
1987
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:
Characterizing water movement in unsaturated fractured rock is important for evaluating the isolation properties of waste repositories. By determining water potential gradients in situ, the direction and magnitude of groundwater flow can be established. This study evaluates four methods, originally designed for soil water potential measurements, for their ability to measure ranges of rock water potentials in situ. The downhole tensiometer, measuring potentials from 0 to -0.85 bars, worked well in laboratory simulations, but was not tested in the field. The osmotic tensiometer, with a measurement range of 0 to -3 bars, was successful in the laboratory but field experiments were inconclusive. Thermocouple psychrometers were not able to give precise water potential measurements, however, temporal trends revealed a range of water potentials from -2 to -50 bars. The absorber method, involving the equilibration of rock water potentials from -2 to -100 bars with filter papers, was also not able to give precise measurements. The four methods need further modifications to improve the accuracy of measurement of rock water potentials, especially for determining the hydraulic head gradient for flow calculations.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Groundwater flow.; Radioactive waste disposal in the ground.
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.titleMeasurement of unsaturated rock water potentials in situen_US
dc.creatorAnderson, Ingrid Christine,1959-en_US
dc.contributor.authorAnderson, Ingrid Christine,1959-en_US
dc.date.issued1987en_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.abstractCharacterizing water movement in unsaturated fractured rock is important for evaluating the isolation properties of waste repositories. By determining water potential gradients in situ, the direction and magnitude of groundwater flow can be established. This study evaluates four methods, originally designed for soil water potential measurements, for their ability to measure ranges of rock water potentials in situ. The downhole tensiometer, measuring potentials from 0 to -0.85 bars, worked well in laboratory simulations, but was not tested in the field. The osmotic tensiometer, with a measurement range of 0 to -3 bars, was successful in the laboratory but field experiments were inconclusive. Thermocouple psychrometers were not able to give precise water potential measurements, however, temporal trends revealed a range of water potentials from -2 to -50 bars. The absorber method, involving the equilibration of rock water potentials from -2 to -100 bars with filter papers, was also not able to give precise measurements. The four methods need further modifications to improve the accuracy of measurement of rock water potentials, especially for determining the hydraulic head gradient for flow calculations.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshGroundwater flow.en_US
dc.subject.lcshRadioactive waste disposal in the ground.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.contributor.committeememberWarrick, Arthuren_US
dc.contributor.committeememberYeh, Jimen_US
dc.identifier.oclc213442497en_US
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