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Model Report

Modular 3-D Transport model

Last Revision Date: 07/11/2011 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Modular 3-D Transport model
Model Overview/Abstract:
MT3D was first developed by Chunmiao Zheng in 1990 at S.S. Papadopulos & Associates, Inc. with partial support from the U.S. Environmental Protection Agency (USEPA). Starting in 1990, MT3D was released as a pubic domain code from the USEPA. Commercial versions with enhanced capabilities were also made available from S.S. Papadopulos & Associates, Inc. and its distributors.

MT3D is based on a modular structure to permit simulation of transport components independently or jointly. MT3D interfaces directly with the U.S. Geological Survey finite-difference groundwater flow model, MODFLOW, for the head solution, and supports all the hydrologic and discretization features of MODFLOW. MT3D has been widely accepted by practitioners and researchers alike and applied in numerous field-scale modeling studies in the United States and throughout the world. The MT3D code has a comprehensive set of solution options, including the method of characteristics (MOC), the modified method of characteristics (MMOC), a hybrid of these two methods (HMOC), and the standard finite-difference method (FDM).

Keywords: MT3D, transport model, fate, transport, modular, finite difference
Model Technical Contact Information:
Mingyu Wang
Center for Subsurface Modeling Support

Zheng, Chunmiao, 1990. MT3D, A modular three-dimensional transport model for simulation of advection, dispersion and chemical reactions of contaminants in groundwater systems, Report to the U.S. Environmental Protection Agency, 170 p

Model Homepage: http://hydro.geo.ua.edu/mt3d/ Exiting the EPA Site

User Information Back to Top
Technical Requirements
Computer Hardware
This system was designed to run under DOS (Disk Operating System) on an IBM PC, XT, AT, PS2, or compatible computer. Graphics capability is not required, but is highly recommended, as most programs will produce graphics output. Graphics support is provided for the Hercules graphics card, the Color Graphics Adapter (CGA), and the Enhanced Graphics Adapter (EGA). At least 512 kilobytes (Kb) of random access memory (RAM) is required, but 640 Kb is recommended. An arithmetic co-processor chip is strongly recommended due to the computationally intensive nature of the programs, but is not required for use. Programs may be run from floppy diskette, however, a fixed disk is required to use the programs from the system menu. The system storage requirement is approximately three megabytes.
Compatible Operating Systems
DOS, Windows
Other Software Required to Run the Model
Download Information
This model can be downloaded HERE
Using the Model
User Support
User's Guide Available?

The model is approved by EPA for regulatory uses.

The model requires calibration for contaminant concentrations at observation wells.

Documentation can be downloaded from:http://www.epa.gov/ada/csmos/models.html

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.

(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),
(7) guidance on the analysis and interpretation of output, and
(8) description of sensitivity analysis, uncertainty analysis, and testing (validation) methodologies and results.

Availability of User Support
Contact CSMOS
User Qualifications
The user needs high level of technical education and/or modeling experience. The user must have an advanced understanding of the governing equations of contaminant fate and transport, and numerical solutions of these equations.

Model Science Back to Top
Summary of Model Structure and Methods
The model uses flexible (user-defined) units.

The model provides mathematical guidance to assist the user when selecting modeling parameters.

Governing equations are solved numerically.
Model Evaluation

Moderate model testing (evaluation) has been performed. The program was tested by evaluating relatively simple problems for which analytical solutions are available. This testing is described in the User's Manual.

The model has been internally peer reviewed. The program and User's Manual were internally reviewed by EPA's Office of Research and Development Subsurface Protection and Remediation Division through the Center for Subsurface Modeling Support (CSMoS).

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