This report describes modifications to a three-dimensional solute-transport model (MODFLOW-GWT) developed by the U.S. Geological Survey (USGS). The modifications improve the capability of MODFLOW-GWT to accurately simulate transport in models that use the Horizontal-Flow Barrier (HFB) Package in MODFLOW. The updated code (1) allows the user to input dispersivity and diffusion properties of HFB barriers, and (2) modifies the calculation of dispersive solute flux near barriers.
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Hornberger et al. (2002) studied this question.
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