In Situ Characterization of Unsaturated Soil Hydraulic Properties at the Maricopa Environmental Monitoring Site.

Persistent Link:
http://hdl.handle.net/10150/191283
Title:
In Situ Characterization of Unsaturated Soil Hydraulic Properties at the Maricopa Environmental Monitoring Site.
Author:
Graham, Aaron Robert.
Issue Date:
2004
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:
Characterization of the unsaturated hydraulic properties is fundamental in modeling soil water flow and contaminant transport in the vadose zone. The objective of this study was to develop a database of in situ determined unsaturated hydraulic properties for a 50 x 50 meter field site. Two infiltration experiments were conducted. Neutron probe and tensiometers were used to determine soil water content and soil water potential to a depth of 10 meters throughout the irrigation and redistribution phases of both experiments. Unsaturated hydraulic conductivity was determined from changes in soil water content using the instantaneous profile method with a simplified unit gradient approach. Hydraulic properties determined from the redistribution phase of experiment 1 were evaluated by means of a one-dimensional forward simulation of wetting front arrival times at the 3, 5 and 10 m depths for experiment 2. It was found that predictions of wetting front arrival times at 10 m were late by an average of 15%. The hydraulic gradient averaged 0.97 throughout the redistribution phase of experiment 1, thus the unit gradient assumption, used to determine unsaturated hydraulic properties for nine locations and 40 depths within the 50 x 50 m field plot, was justified for this deep layered profile.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Environmental sciences.; Hydrology -- Arizona -- Maricopa County.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Soil, Water and Environmental Science; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Wierenga, Peter J.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleIn Situ Characterization of Unsaturated Soil Hydraulic Properties at the Maricopa Environmental Monitoring Site.en_US
dc.creatorGraham, Aaron Robert.en_US
dc.contributor.authorGraham, Aaron Robert.en_US
dc.date.issued2004en_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.abstractCharacterization of the unsaturated hydraulic properties is fundamental in modeling soil water flow and contaminant transport in the vadose zone. The objective of this study was to develop a database of in situ determined unsaturated hydraulic properties for a 50 x 50 meter field site. Two infiltration experiments were conducted. Neutron probe and tensiometers were used to determine soil water content and soil water potential to a depth of 10 meters throughout the irrigation and redistribution phases of both experiments. Unsaturated hydraulic conductivity was determined from changes in soil water content using the instantaneous profile method with a simplified unit gradient approach. Hydraulic properties determined from the redistribution phase of experiment 1 were evaluated by means of a one-dimensional forward simulation of wetting front arrival times at the 3, 5 and 10 m depths for experiment 2. It was found that predictions of wetting front arrival times at 10 m were late by an average of 15%. The hydraulic gradient averaged 0.97 throughout the redistribution phase of experiment 1, thus the unit gradient assumption, used to determine unsaturated hydraulic properties for nine locations and 40 depths within the 50 x 50 m field plot, was justified for this deep layered profile.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshEnvironmental sciences.en_US
dc.subject.lcshHydrology -- Arizona -- Maricopa County.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineSoil, Water and Environmental Scienceen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairWierenga, Peter J.en_US
dc.identifier.oclc217299763en_US
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