Application of Vadose Zone Flow and Transport Modelsby E. Zia Hosseinipour, AScI Corp, Athens, United States,
Vincent M. Gorokhovski, AScI Corp, Athens, United States,
Abstract: This paper summarizes application of two subsurface flow and transport models at Superfund sites, and evaluation of a number of other unsaturated zone models. The screening level models MULTIMED and VLEACH were applied at typical contaminated sites and the simulation results analyzed in detail. Other models were also reviewed in this study. General findings of this study are: (1) there is no objective criteria in model selection for Remedial Investigations and Feasibility Studies (RI/FS) at contaminated sites; (2) the models used in the final phase of this study are flexible enough to be calibrated with reasonable accuracy at about any site, but goodness of fit does not guarantee reliable predictions; (3) the models are not easy for calibrations, RI/FS optimization, and transport process evaluations; and (4) the models possess potential for site specific application by experienced professionals and need major improvement in order to become functional for routine application.
Subject Headings: Model analysis | Soil pollution | Site investigation | Feasibility studies | Model accuracy | Optimization models | Groundwater pollution
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