Category Contaminant transport (2D analytical)
Publisher  US Environmental Protection Agency 
Platform DOS, Win3x
Status Public domain
Description HSSM (Hydrocarbon Spill Screening Model) is an interactive, semi-analytical model intended for simulation of subsurface releases of light non-aqueous phase liquids (LNAPLs). The model consists of separate modules for LNAPL flow through the unsaturated zone (KOPT-Kinematic Oily Pollutant Transport), spreading in the capillary fringe (OILENS), and transport of dissolved spill components in the water table aquifer (TSGPLUME-Transient Source Gaussian PLUME model). The soil/aquifer material is homogeneous. Spreading in the capillary fringe is assumed radial and not subject to a regional gradient of the water table. Advective-dispersive transport of dissolved phase in the saturated zone is subject to regional uniform flow and recharge. The source is assumed at the soil surface and may be a constant flux source, a volume source, or a constant head source. The modules KOPT and OILENS provide a time-variable source condition for the aquifer transport model. Graphic output includes saturation profiles, NAPL lens profiles, NAPL lens radius history, contaminant mass flux history, NAPL lens contaminant mass balance, receptor concentration histories. Includes a soil property regression utility to estimate soil hydraulic properties using the regression equations of Rawls and Brakensiek (1985). It also includes a utility for calculation of the NAPL/water partition coefficient based on Raoults law.
Cost Free on WWW
Data formats supported None stated
Supplier in United States of America  International Ground Water Modeling Center 
Supplier in United States of America  Scientific Software Group 
Supplier in United States of America  US Environmental Protection Agency 

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