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NAPL: SIMULATOR DOCUMENTATION
Citation:
Guarnaccia, J., G. Pinder, AND M. Fishman. NAPL: SIMULATOR DOCUMENTATION. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-97/102 (NTIS 98-106495), 1997.
Impact/Purpose:
information
Description:
A mathematical and numerical model is developed to simulate the transport and fate of NAPLs (Non-Aqueous Phase Liquids) in near-surface granular soils. The resulting three-dimensional, three phase simulator is called NAPL. The simulator accommodates three mobile phases: water, NAPL and gas, as well as water- and gas-phase transport of NAPL contaminants. The numerical solution algorithm is based on a Hermite collocation finite element discretization. Particular attention has been paid to the development of a sub-model that describes three-phase hysteretic permeability-saturation-pressure (k-S-P) relationships, and that considers the potential entrapment of any fluid when it is displaced. In addition rate-limited dissolution and volatilization mass transfer models have been included. The overall model has been tested for self-consistency using mass balance and temporal and spatial convergence analysis. The hysteretick k-S-P and mass exchange models have been tested against experimental results. Several example data sets are provided, including a setus of the artificial aquifer experiments being conducted at the EPA's Subsurface Protection and Remediation Division of the National Risk Management Research Laboratory in Ada, OK.