Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona
Ground-water declines of several feet per year since the 1940's induced aquifer-system compaction and land subsidence of as much as 0.5 foot in the Tucson basin and 1.1 feet in Avra Valley. Aquifer-system compaction is affected by layering, hydraulic diffusivity, preconsolidation stress, and st...
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The University of Arizona.
1988
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-1919832015-10-23T04:38:04Z Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona Hanson, Randall Tyler,1953- Neuman, Shlomo P. Ground-water declines of several feet per year since the 1940's induced aquifer-system compaction and land subsidence of as much as 0.5 foot in the Tucson basin and 1.1 feet in Avra Valley. Aquifer-system compaction is affected by layering, hydraulic diffusivity, preconsolidation stress, and stress history of the aquifer system. Layering at extensometer sites can be categorized into three general groups that typify the fine- and coarse-grained layering within the Fort Lowell Formation and upper Tinaja beds. A one-dimensional compaction model was used to simulate aquifer-system compaction of less than 0.1 foot. Elastic and some inelastic specific storage values are comparable to previous estimates. Parts of the aquifer systems appear to be in transition from predominantly elastic to inelastic compaction. Water-level declines since 1940 at the six modeled extensometer sites are within an estimated preconsolidation-stress threshold of 50 to 150 feet. The simulations were most sensitive to reduction of initial preconsolidation stress and least sensitive to changes in aquifer specific storage. 1988 Thesis-Reproduction (electronic) text http://hdl.handle.net/10150/191983 213332406 en 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. The University of Arizona. |
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en |
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description |
Ground-water declines of several feet per year since the 1940's induced aquifer-system compaction and land subsidence of as much as 0.5 foot in the Tucson basin and 1.1 feet in Avra Valley. Aquifer-system compaction is affected by layering, hydraulic diffusivity, preconsolidation stress, and stress history of the aquifer system. Layering at extensometer sites can be categorized into three general groups that typify the fine- and coarse-grained layering within the Fort Lowell Formation and upper Tinaja beds. A one-dimensional compaction model was used to simulate aquifer-system compaction of less than 0.1 foot. Elastic and some inelastic specific storage values are comparable to previous estimates. Parts of the aquifer systems appear to be in transition from predominantly elastic to inelastic compaction. Water-level declines since 1940 at the six modeled extensometer sites are within an estimated preconsolidation-stress threshold of 50 to 150 feet. The simulations were most sensitive to reduction of initial preconsolidation stress and least sensitive to changes in aquifer specific storage. |
author2 |
Neuman, Shlomo P. |
author_facet |
Neuman, Shlomo P. Hanson, Randall Tyler,1953- |
author |
Hanson, Randall Tyler,1953- |
spellingShingle |
Hanson, Randall Tyler,1953- Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona |
author_sort |
Hanson, Randall Tyler,1953- |
title |
Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona |
title_short |
Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona |
title_full |
Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona |
title_fullStr |
Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona |
title_full_unstemmed |
Aquifer-system compaction, Tucson Basin and Avra Valley, Arizona |
title_sort |
aquifer-system compaction, tucson basin and avra valley, arizona |
publisher |
The University of Arizona. |
publishDate |
1988 |
url |
http://hdl.handle.net/10150/191983 |
work_keys_str_mv |
AT hansonrandalltyler1953 aquifersystemcompactiontucsonbasinandavravalleyarizona |
_version_ |
1718098732255281152 |