Citation:

Description:

VLEACH is a one-dimensional, finite difference model for making preliminary assessments of the effects on ground water from the leaching of volatile, sorbed contaminants through the vadose zone. The program models four main processes: liquid-phase advection, solid-phase sorption, vapor-phase diffusion, and three-phase equilibration. In an individual run, VLEACH can simulate leaching in a number of distinct polygons, which may differ in terms of soil properties, recharge rates, depth of water, or initial conditions. Modeling results in an overall, area-weighted assessment of ground-water impact.

Record Details:

Model Detail:

The model and user's manual were externally peer reviewed by outside peer reviewers and beta testers. The comments from these testers were reviewed by EPA's Office of Research and Development Subsurface Protection and Remediation Division.

Model URL :http://www.epa.gov/nrmrl/gwerd/csmos/models/vleach.html

Model Guidance Documents :The model is approved by EPA for regulatory uses.User needs only moderate level of technical education and/or modeling experience. The user should have an understanding of ground water flow and contaminant transport governing equations and the solutions of those equations.

Documentation can be downloaded here.

For a paper copy of the User's Manual, send requests to: The Center for Subsurface Modeling Support (CSMoS), R.S. Kerr Research Center, P.O. Box 1198, Ada OK 74820. CSMoS will mail the requested manuals to the requestor.

To receive the User's Manual in magnetic or optical format, send blank CDs, Zip disks, or 3.5" floppy diskettes to: The Center for Subsurface Modeling Support (CSMoS), R.S. Kerr Research Center, P.O. Box 1198, Ada OK 74820. CSMoS will copy the requested manuals to the supplied disks and return them to the requestor.

Provides: (1) an abstract or abstract equivalent in the introduction, (2) schematic/diagram showing model structure and interaction of model components, (3) equations, equation solution methodologies, and related simplifying assumptions, (4) example input/output files, (5) input and output variable documentation including definitions, units, temporal/spatial dimensions, temporal/spatial resolution options, and (if applicable such as with FORTRAN) format, (6) guidance on selecting and/or estimating values and/or distributions for input variables (including guidance on calibration and selecting default values and/or distributions), and (7) guidance on the analysis and interpretation of output.

Model Download Information :This model is available for download t http://www.epa.gov/nrmrl/gwerd/csmos/models/vleach.html

modelcontactinfo :Mingyu Wang
Center for Subsurface Modeling Support
wang.mingyu@epa.gov
580-436-8656

The model was developed by Varadhan Ravi and Jeffrey A. Johnson of Dynamac Corporation. It is maintained by the U.S. EPA, Office of Research and Development, National Risk Management Research Laboratory (NRMRL), Subsurface Protection and Remediation Division (SPRD), Center for Subsurface Modeling Support (CSMoS).

Model Inputs :Site-specific inputs are required for aquifer hydrogeological properties, contaminant fate and transport properties, and recharge and vadose zone water saturation properties.

Model Computer Requirements: