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    THE EFFECT OF PEDO-TRANSFER FUNCTIONS ON ESTIMATED RATES AND PATTERNS OF POTENTIAL RECHARGE

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    azu_td_hwr_0083_sip1_w.pdf
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    Author
    Faust, Abigail Elizabeth
    Issue Date
    2003
    Advisor
    Ferre, T.P.A.
    Committee Chair
    Ferre, T.P.A.
    
    Metadata
    Show full item record
    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
    Accurate estimates of recharge rates and areal distributions of recharge within basins are necessary for water-resources management and aquifer protection. Given the difficulties involved with measuring recharge, basin-scale methods of estimating potential recharge (water available to recharge the saturated zone) have become popular. Using a waterbalance approach, basin-scale models partition water among potential recharge, runoff, and storage. Key soil properties in the soil-moisture balance are porosity (water content at saturation) and field capacity (water content at 10 kPa), which are commonly obtained from spatially referenced soil datasets through pedo-transfer functions (PTFs). PTFs translate soil data, such as particle-size distributions and bulk density, into soil hydraulic parameters. Rillito Creek watershed, near Tucson, Arizona, was used to illustrate the effect of using different PTFs in a basin-scale soil-moisture balance to estimate the areal distribution and rate of potential recharge. Using 10 common PTFs, the estimated rate of potential recharge for the Rillito Creek watershed varied by nearly an order of magnitude, and the area over which recharge occurred varied by a factor of two. These large ranges demonstrate the sensitivity of soil-moisture balance models to soil-property estimates derived from PTFs.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Hydrology and Water Resources
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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