Volume 37, Issue 4 (July 2014)

    Evaluation of Parameterization Techniques for Unsaturated Hydraulic Conductivity Functions for Municipal Solid Waste

    (Received 6 August 2013; accepted 18 March 2014)

    Published Online: 2014

    CODEN: GTJOAD

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    Abstract

    A study was conducted to evaluate methods for parameterizing constitutive functions describing the unsaturated hydraulic conductivity () and water retention curve (WRC) for municipal solid waste (MSW). Water retention curves and were measured using a hanging column apparatus and the multistep outflow (MSO) method on MSW specimens compacted at three different dry densities. Parameters for constitutive functions describing the WRC and were determined via nonlinear regression on the WRC data, nonlinear regression on the WRC and data, and numerical inversion conditioning on the water content and transient outflow data. Nonlinear regression of the measured WRC and and numerical inversion reproduced the measured with the least error. Nonlinear regression on only the WRC data resulted in the least error between the predicted and measured WRC but the greatest errors between the predicted and measured . Flow simulations using parameters obtained with any of the three parameter-estimation methods typically resulted in errors in predicted flow corresponding to errors in the specimen water content ranging between 1 % and 5 %, with some simulations returning errors of as much as 10 %. Inclusion of transient flow data (through inversion) or data results in improved parameterization for constitutive functions for . However, reasonable reproduction of flow data from the MSO tests was achieved using parameters obtained from regression on only WRC data.


    Author Information:

    Breitmeyer, Ronald J.
    Assistant Professor, Geological Engineering, Univ. of Nevada-Reno, Reno, NV

    Benson, Craig H.
    Wisconsin Distinguished Professor and Chair, Geological Engineering, Univ. of Wisconsin-Madison, Madison, WI


    Stock #: GTJ20130132

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20130132

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    Author
    Title Evaluation of Parameterization Techniques for Unsaturated Hydraulic Conductivity Functions for Municipal Solid Waste
    Symposium , 0000-00-00
    Committee D34