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Browsing by Author "Kemper, William D., committee member"

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    Effect of depth of water table on evaporation from fine sand
    (Colorado State University. Libraries, 1957) Staley, Robert William, author; Corey, Arthur T., advisor; Kemper, William D., committee member; Cermak, Jack E., committee member
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    Physical properties of porous medium affecting laminar and turbulent flow of water
    (Colorado State University. Libraries, 1967-06) Ahmed, Nazeer, author; Sunada, Daniel K., advisor; Kemper, William D., committee member; Bittinger, Morton W., committee member; Squier, Donald P., committee member; Longenbaugh, Robert A., committee member
    An investigation was conducted to study the influences of certain physical properties of the porous medium on the flow phenomena. An equation, representing hydraulic gradient as a function of bulk velocity, was developed by analyzing the Navier-Stokes equations. During the development of the equation it was shown that energy losses caused by turbulence being small could be neglected in comparison to the energy represented by convective terms. Two dimensionless parameters were developed from the flow equation, and a unique relationship was shown to exist between them for all porous media studied in this investigation. The characteristic length of the flow was shown to have linear relationships with particle diameter obtained from sieve analysis, and pore and grain diameter obtained from cut-section data of porous media.
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    Steady upward flow from water tables
    (Colorado State University. Libraries, 1965) Arbhabhirama, Anat, author; Corey, Arthur T., advisor; Kemper, William D., committee member; Hanks, R. John, committee member; Sandborn, Virgil A., committee member
    The rate of upward flow from water tables is an important factor in irrigated areas for determining the depth at which water tables should be maintained. This study attempted to relate the maximum rate of upward flow to measurable soil parameters under various conditions of the soil-water system, and to determine more precisely the effect of hysteresis. Theoretical solutions were developed to determine the maximum upward flow rate as a function of depth of water table and necessary soil parameters. To verify these solutions, laboratory investigations were conducted. The experiments were conducted so that the ambient conditions did not affect the upward flow rates. Upward flow was induced at the top of the soil columns by means of an outflow siphon. An inflow siphon was connected to an inflow barrier at ยท the bottom of the soil column to maintain the water table as desired. Three conditions of the soil-liquid system were used, i.e., drainage, imbibition and imbibition-drainage cycles. The results gave good agreement between the theoretical solution and experimental results for both drainage and imbibition cycles. The imbibition-drainage cycle was conducted to study the effect of hysteresis. This effect caused the maximum rates of upward flow to drop 20 to 50 percent below the theoretical values.