||3DFEMWATER/3DLEWASTE : numerical codes for delineating wellhead protection areas in agricultural regions based on the assimilative capacity criterion /
Yeh, G. T. ;
Sharp-Hansen, S. ;
Lester, B. ;
Strobl, R. ;
||AQUA TERRA Consultants, Mountain View, CA. ;Pennsylvania State Univ., University Park. ;GeoTrans, Inc., Sterling, VA. ;AScI Corp., Athens, GA.;Environmental Research Lab., Athens, GA.
|| Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
||EPA 600-R-92-223; EPA-68-CO-0019
Wellheads--Protection--Mathematical models. ;
Groundwater--Pollution--Mathematical models. ;
Water, Underground--Pollution--Mathematical models
Three dimensional flow ;
Water pollution control ;
Water wells ;
Path of pollutants ;
Ground water ;
Agricultural chemicals ;
Agricultural wastes ;
Water supply ;
Computerized simulation ;
Air water interfaces ;
Sediment water interfaces ;
Saturated flow ;
Unsaturated flow ;
3DFEMWATER computer model ;
3DLEWASTE computer model
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||xi, 240 pages : illustrations ; 28 cm
Two related numerical codes, 3DFEMWATER and 3DLEWASTE, are presented that can be used to delineate wellhead protection areas in agricultural regions using the assimilative capacity criterion. 3DFEMWATER (Three-dimensional Finite Element Model of Water Flow Through Saturated-Unsaturated Media) simulates subsurface flows, whereas 3DLEWASTE (Hybrid Three-dimensional Lagrangian-Eulerian Finite Element Model of Waste Transport Through Saturated-Unsatured Media) models contaminant transport. Both codes treat heterogeneous and anisotropic media consisting of as many geologic formations as desired, consider both distributed and point sources/sinks that are spatially and temporally dependent, and accept for types of boundary conditions--i.e., Dirichlet (fixed-head or concentration), specified-flux, Neumann (specified-pressure-head gradient or specified-dispersive flux), and variable. The variable boundary condition in 3DFEMWATER simulates evaporation/infiltration/seepage at the soil-air interface and, in 3DLEWASTE, simulates mass infiltration into or advection out of the system. 3DLEWASTE contains options to model adsorption using a linear, Fruendlich, or Langmuir isothern, plus dispersion, and first-order decay.
"EPA/600/R-92/223" "November 1992" PB93-217669 Includes bibliographical references (p. 150-152).