Record Display for the EPA National Library Catalog


Main Title Modeling Multiphase Organic Chemical Transport in Soils and Ground Water.
Author Parker, J. C. ; Katyal, A. K. ; Kaluarachchi, J. J. ; Lenhard, R. J. ; Johnson., T. J. ;
CORP Author Virginia Polytechnic Inst. and State Univ., Blacksburg.;Robert S. Kerr Environmental Research Lab., Ada, OK. Processes and Systems Research Div.
Publisher Aug 91
Year Published 1991
Report Number EPA R-814320; EPA/600/J-91/042;
Stock Number PB91-231514
Additional Subjects Subsurface investigations ; Environmental transport ; Organic compounds ; Water pollution ; Land pollution ; Mathematical models ; Groundwater movement ; Soil surveys ; Porous media ; Groundwater resources ; Base flow ; Multiphase flow ; Mass transfer ; Permeability ; Saturation ; Pore pressure ; Nonaqueous phase liquid
Library Call Number Additional Info Location Last
NTIS  PB91-231514 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 217p
Subsurface contamination due to immiscible organic liquids is a widespread problem which poses a serious threat to ground-water resources. In order to understand the movement of such materials in the subsurface, a mathematical model was developed for multiphase flow and multicomponent transport in porous media with water, NAPL and air or any subset of these phases. Numerical procedures for solving the system of coupled flow equations, based on various formulations of the governing equations, were compared. Accurate representation of three-phase permeability-saturation-capillary pressure (k-S-P) relations is crucial to model multiphase fluid movement and accurate models for interphase mass partitioning are critical to describe species transport. A detailed description of hysteresis in three-phase k-S-P relations was reported. Simplified models, which consider effects of nonwetting fluid entrapment, were shown to provide a reasonable compromise between accuracy, on the one hand, and efficiency and robustness, on the other. Laboratory studies of light and dense NAPLs in a 1 x 1.5 meter sand tank, involving measurements of water and NAPL pressures and saturations and component concentrations, are described. These studies were used to validate the mathematical model for multiphase flow and transport.