Comparison of small-scale and field-scale saturated hydraulic conductivity : a tale of ores and drains Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/fx719s25b

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  • Saturated hydraulid conductivity (Ks) is a central soil physical property in determining water movement and contaminant transport through soils; hence modeling this system requires an accurate determination of K. Decimeter-scale KS measurements employing cores or infiltrometers are used frequently, but field-scale KS values are required to encompass the full range of operational flow processes. The objective of this study was to determine the utility of small-scale measurements in describing field-scale permeability. Four tile-drained fields in the Willamette Valley, Oregon; were studied for drainage rate and contaminant transport from field-applied chemicals to ground water and surface water. Decimeter-scale Ks was measured using 137 cm3 undisturbed soil cores collected at depths of 30, 60, 90 and 120 cm. Field-scale KS is estimated using a classic solution to the time-dependent non-linear Boussinesq equation developed by Polubarinova-Kochina (P-K) for the shape and evolution of a water table draw down in response to parallel horizontal drains overlaying an impermeable layer. Piezometers were installed along a perpendicular transect crossing two drains to observe water table fluctuations. These data were fitted to the P-K model to determine K. Key observations included a good fit of the observations to the model, and a dramatic permeability increase, exceeding 10 fold, seen at the field-scale compared to the decimeter-scale. This indicates that transport through soils will occur much faster than estimated using decimeter-scale measurements of Ks. The P-K approach is a practical, low cost method to obtain field-scale permeability.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 Grayscale), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2007-12-17T21:33:24Z (GMT) No. of bitstreams: 1 Owens_Jos.pdf: 1697648 bytes, checksum: ec2336d4249b3bd0c8c2501cc04544b8 (MD5)
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