Showing items related by title, author, creator and subject.

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  Mapping of Holocene River Alluvium along the San Pedro River, Aravaipa Creek, and Babocomari River, Southeastern Arizona

  Cook, J.P.; Youberg, A.; Pearthree, P.A.; Onken, J.A.; MacFarland, B.J.; Haddad, D.E.; Bigio, E.R.; Kowler, A.L. (Arizona Geological Survey (Tucson, AZ), 2009-07-01)
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  Populus Fremontii Tree Ring Analysis and Semi-Arid River Water Source Variability over Time, San Pedro River, Arizona

  Meixner, Thomas; Stolar, Rebecca Ann; Hu, Jia; Niu, Guo-Yue (The University of Arizona., 2019)

  Summer floods are an important source of sustained streamflow in arid and semi-arid rivers of the American Southwest and Northwest Mexico. The degree to which natural function versus human alterations influence the system is subject to debate. Environmental information in the tree ring cellulose of Populus can be used to investigate the variation in water sources over time in these areas. Past research has shown that streamflow sources in the San Pedro Basin of Arizona vary isotopically between a source water of basin ground water and a summer flood water source. This study uses isotopic analyses of Populus fremontii and atmospheric data in the San Pedro Basin to estimate the water source of the trees and the river water source condition. After analyzing weather data within the basin, an inversion of the Barbour oxygen isotope model using tree ring cellulose isotopes was used to obtain the water source isotopic composition. The variation in water source composition inferred from the model was then compared to the river composition over time. It was initially found that each site’s water source isotopic composition was significantly different from the source water. However, several water source isotopic compositions were found to be more negative than the known basin groundwater signature in each of the study sites. Following sensitivity analyses on various parameters within the model, it was seen that relative humidity has a strong influence on the determination of source water. Therefore, relative humidity must be an accurate measurement and is not considered to be so in this study. Furthermore, in order to understand the degree to which natural function versus human alterations influence the system, older Populus fremontii tree ring isotopes are needed, posing a question regarding the reliability of the species.
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  Quality Transformations in Recharged River Water During Possible Interactions with Landfill Deposits Along the Santa Cruz River: Annual Report, Phase 2, 1973-1974

  Wilson, L. G.; Herbert, Richard; Ramsey, Chris; Randall, J. H.; Water Resources Research Center, University of Arizona; Water Resources Research Center, University of Arizona; Water Resources Research Center, University of Arizona; Water Resources Research Center, University of Arizona (Water Resources Research Center, University of Arizona (Tucson, AZ), 1974-08-08)

  The overall objectives of a study initiated in 1972 by the Water Resources Research Center (Univ. of Arizona), in cooperation with the Pima County Dept. of Sanitation, are to examine the possibility of interactions between recharged river water and deposits in adjoining landfills, and if such interactions occur to evaluate the effect on native groundwater quality. Corresponding to these objectives, the principal function of a monitoring program initiated during the project was to characterize background water levels and native groundwater quality during normal low flows (i.e., sewage flows) in the river, and to monitor changes, if such occur, during flood flows. As it turns out, data from the project should also be applicable to the anticipated irrigation of farmland near Marana, using effluent from the Impending Ina Rd Treatment Facility. In particular, clues will be provided on transformations in sewage effluent quality during infiltration and deep percolation. The first phase of the project was conducted at the Ina Rd landfill and the second involved both the Ina Rd and Ruthrauff Rd fills. Results of the first phase were reported in a paper by Wilson and Small. This report will review the results of the second study phase. Specific objectives of the studies during the second phase included (1) obtaining river water and well water samples for chemical and microbiological analysis, (2) monitoring water level changes in available wells and (3) characterizing general features of the geohydrology in the vicinity of the landfills.