Persistent Link:
http://hdl.handle.net/10150/191676
Title:
A ground-water modelling study in the Tucson Basin
Author:
Fogg, Graham Edwin.
Issue Date:
1978
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:
A digital numerical model of the Cortaro area, which underlies about 150 square miles of the northwest section of the Tucson Basin, was constructed. The model is based on a novel, mixed explicit-implicit, finite-element scheme. All previous ground-water models for the Tucson Basin have been constructed with prescribed flux boundary conditions along stream courses and exterior boundaries; however, the magnitudes of these fluxes were generally unknown and had to be estimated using methods of uncertain validity. In contrast, the boundary conditions of the present model were prescribed hydraulic heads derived from direct measurements. The model was calibrated under the quasi-steady-state conditions prevailing in 1940, and verified for the period 1940-65 under transient conditions. The head distributions computed by the model for 1940 and 1965 are within a few feet of measured values over most of the region. At prescribed head boundaries, the model computed time-varying source terns representing subsurface lateral flow rates and recharge rates along stream courses. Model results show: 1) an increase in recharge along the Santa Cruz River between 1951 and 1965 (due to infiltration of sewage effluent) together with a decline in the overall rate of pumpage in the Cortaro Basin during that period caused the rate of lateral flow out of the basin at Rillito Narrows to increase gradually with time, and 2) the rate of lateral subsurface flow entering the Cortaro Basin from the valley of Canada del Oro is more than twice the rate entering from the Tucson Basin through the southeast boundary of the study area. These results differ from those given in the published literature.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Groundwater -- Arizona -- Cortaro Basin -- Mathematical models.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Neuman, Shlomo P.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleA ground-water modelling study in the Tucson Basinen_US
dc.creatorFogg, Graham Edwin.en_US
dc.contributor.authorFogg, Graham Edwin.en_US
dc.date.issued1978en_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.abstractA digital numerical model of the Cortaro area, which underlies about 150 square miles of the northwest section of the Tucson Basin, was constructed. The model is based on a novel, mixed explicit-implicit, finite-element scheme. All previous ground-water models for the Tucson Basin have been constructed with prescribed flux boundary conditions along stream courses and exterior boundaries; however, the magnitudes of these fluxes were generally unknown and had to be estimated using methods of uncertain validity. In contrast, the boundary conditions of the present model were prescribed hydraulic heads derived from direct measurements. The model was calibrated under the quasi-steady-state conditions prevailing in 1940, and verified for the period 1940-65 under transient conditions. The head distributions computed by the model for 1940 and 1965 are within a few feet of measured values over most of the region. At prescribed head boundaries, the model computed time-varying source terns representing subsurface lateral flow rates and recharge rates along stream courses. Model results show: 1) an increase in recharge along the Santa Cruz River between 1951 and 1965 (due to infiltration of sewage effluent) together with a decline in the overall rate of pumpage in the Cortaro Basin during that period caused the rate of lateral flow out of the basin at Rillito Narrows to increase gradually with time, and 2) the rate of lateral subsurface flow entering the Cortaro Basin from the valley of Canada del Oro is more than twice the rate entering from the Tucson Basin through the southeast boundary of the study area. These results differ from those given in the published literature.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshGroundwater -- Arizona -- Cortaro Basin -- 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.chairNeuman, Shlomo P.en_US
dc.identifier.oclc212779958en_US
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