Volume 23, Issue 4 (December 2000)

    Tomographic Evaluation of Air and Water Flow Patterns in Soil Column

    (Received 23 June 1999; accepted 8 May 2000)

    CODEN: GTJOAD

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    Abstract

    This paper describes the use of computerized tomography (CT) as a nondestructive method to estimate the three-dimensional spatial distributions of porosity, air, and water saturations during air-water displacement tests in a soil column. Local porosity was found to be a critical factor in controlling the air and water flow patterns. In nonhomogeneous soil, high local porosity promotes early development of isolated air channel breakthrough that maintains a high average water retention saturation. In homogenous soil, micro air channels are established uniformly, resulting in a low water saturation. Interpretation of data based on overall porosity could lead to unreliable flow analysis for water and/or air movement in unsaturated soil. In addition, this paper investigates the use of gas exsolution to enhance the delivery of air within soil media.


    Author Information:

    Wong, RCK
    Professor of Department of Civil Engineeringsenior staff engineer, The University of CalgaryTreadwell & Rollo, Inc., San Francisco, CA

    Wibowo, R
    Professor of Department of Civil Engineeringsenior staff engineer, The University of CalgaryTreadwell & Rollo, Inc., San Francisco, CA


    Stock #: GTJ11062J

    ISSN: 0149-6115

    DOI: 10.1520/GTJ11062J

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    Author
    Title Tomographic Evaluation of Air and Water Flow Patterns in Soil Column
    Symposium , 0000-00-00
    Committee D18