Measured temperature profiles to evaluate recharge In the semiarid southwest

Persistent Link:
http://hdl.handle.net/10150/191369
Title:
Measured temperature profiles to evaluate recharge In the semiarid southwest
Author:
Dowman, Charles E.
Issue Date:
2002
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:
Natural recharge is one of the most poorly constrained components of the water budget. In semiarid environments, quantifying natural recharge is difficult due to the relatively low fluxes and the thick unsaturated zones. Measuring deep recharge to great depths in multiple locations is impractical and cost prohibitive for most measurement methods. An alternative method to estimate deep percolation utilizes temperature profiles measured from the ground surface to the water table. Temperature measurements taken in existing cased wells provide an economical and useful vantage for accessing many locations within a basin. A controlled infiltration experiment was conducted to test the feasibility of using downhole temperature measurements to estimate the infiltration flux. VS2DHI (Healy and Ronan, 1996), an interactive numerical model, was used to predict and interpret coupled water-flow and heat-transport occurring in the subsurface during infiltration and redistribution. A sequential sensitivity analysis showed that downhole temperature profiles were most sensitive to the temperature of the applied water, the water flux, and the heat capacity of the dry soil. This downhole temperature method was extended to a natural setting. Temperature profiles were measured at six sites within the Tucson Basin. The temperature profiles varied throughout the basin, and the factors affecting the temperature profiles were numerous. Profiles from the in-channel and intrabasin boreholes showed effects of focused recharge, mountain-front recharge, and stream-channel recharge. Results suggest that this temperature method may be transferable to other basins in semiarid regions.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Groundwater recharge -- Southwestern States.; Groundwater recharge -- Arizona -- Tucson.; Temperature measurements.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Ferre, P. A. Ty

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleMeasured temperature profiles to evaluate recharge In the semiarid southwesten_US
dc.creatorDowman, Charles E.en_US
dc.contributor.authorDowman, Charles E.en_US
dc.date.issued2002en_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.abstractNatural recharge is one of the most poorly constrained components of the water budget. In semiarid environments, quantifying natural recharge is difficult due to the relatively low fluxes and the thick unsaturated zones. Measuring deep recharge to great depths in multiple locations is impractical and cost prohibitive for most measurement methods. An alternative method to estimate deep percolation utilizes temperature profiles measured from the ground surface to the water table. Temperature measurements taken in existing cased wells provide an economical and useful vantage for accessing many locations within a basin. A controlled infiltration experiment was conducted to test the feasibility of using downhole temperature measurements to estimate the infiltration flux. VS2DHI (Healy and Ronan, 1996), an interactive numerical model, was used to predict and interpret coupled water-flow and heat-transport occurring in the subsurface during infiltration and redistribution. A sequential sensitivity analysis showed that downhole temperature profiles were most sensitive to the temperature of the applied water, the water flux, and the heat capacity of the dry soil. This downhole temperature method was extended to a natural setting. Temperature profiles were measured at six sites within the Tucson Basin. The temperature profiles varied throughout the basin, and the factors affecting the temperature profiles were numerous. Profiles from the in-channel and intrabasin boreholes showed effects of focused recharge, mountain-front recharge, and stream-channel recharge. Results suggest that this temperature method may be transferable to other basins in semiarid regions.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshGroundwater recharge -- Southwestern States.en_US
dc.subject.lcshGroundwater recharge -- Arizona -- Tucson.en_US
dc.subject.lcshTemperature measurements.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.chairFerre, P. A. Tyen_US
dc.identifier.oclc226258256en_US
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