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Estimation of Solute Concentrations Using the Pathline Counting Method

Authors

  • Jeffrey A. Johnson,

    1. Computer Data Systems, Inc., Robert S. Kerr Environmental Research Laboratory, P.O. Box 1198, Ada, Oklahoma 74820. (Presently with Environmental Systems & Technologies, Inc., 2608 Sheffield Drive, Blacksburg, Virginia 24060-8270.)
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  • Varadhan Ravi,

    1. Dynamac Corporation, Robert S. Kerr Environmental Research Laboratory, P.O. Box 1198, Ada, Oklahoma 74820.
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  • J. Kevin Rumery

    1. Waste Tech Services, 800 Jefferson County Parkway, Golden, Colorado 80401.
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Abstract

The paper discusses the use of the “pathline counting” approach to estimate solute concentrations at an extraction well using particle-tracking flow models. The pathline counting approach is a unique method for predicting solute concentrations due to mixing. The pathline counting method using the semianalytical module RESSQC, contained within the WHPA model, was compared to MT3D, a numerical mass transport code, for a simple hypothetical problem. Results from the comparison indicate that results from the pathline counting approach were in reasonable agreement with the MT3D results. This approach was then applied to a field study, the Park City Bioremediation Project. The migration of a conservative tracer injected into three upgradient cells was simulated to estimate the concentration of solute at two pumping wells. The calculated concentrations compared favorably with measured field concentrations.

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