MT3D Version DoD_1.5
An Upgrade to the USEPA Version for
U.S. Army Engineer Waterways Experiment Station
This version of MT3D was developed at the University of Alabama
for US Army Engineer Waterways Experiment Station from the public domain version (Version
1.1, 1/1992), currently distributed by US Environmental Protection Agency (USEPA). Listed
below are the major modifications and enhancements made to this version:
- Replacement of the simple arithmetic averaging scheme used for
computing the cell concentration from particle concentrations in the MOC solution by a
volume-based weighting scheme. This change can significantly reduce the mass balance
discrepancy in the MOC solution with irregular grid spacing.
- Modification of the operator-splitting scheme in the MOC solution
for improved solution accuracy in modeling very heterogeneous aquifers.
- An updated Dispersion package to use "dispersion
conductance" in computing dispersive fluxes for better handling of dispersion cross
- Improved handling of the transient groundwater storage term and
non-uniform porosity distribution, eliminating mass balance errors caused by these
- Improved time-stepping control for the explicit, upstream
finite-difference solution to guarantee stability.
- Support for the MODFLOW BCF2 package with the rewetting
- Support for the MODFLOW Stream-flow Routing (STR1) package. Note
that the RIV1 and STR1 packages must not be used in the same simulation.
- Allow multiple stress period transport simulation in conjunction
with a steady-state flow model with only one stress period. The flow-transport link file
saved by MODFLOW containing flow velocity and sink/source information needed for transport
simulation is read only once by MT3D.
This version will be replaced by the new MT3DMS
code when it becomes available from the US Army Corps of Engineers.
- Download the files "mt3d150d.zip" and "modflow2.zip" (Modflow with
Version 2 of MT3D interface);
- Uncompress the downloaded files using PKUNZIP in two separate temporary subdirectories;
- Copy the executable MT3D executable file MT3D.EXE and Modflow file MODF.EXE to the
desired subdirectory whose path is included in the DOS PATH statement;
- Check the README files for more information.
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Last modified: June 14, 2001