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Visual MODFLOW Pro
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MT3D
99
The Most Recent Version of
the Leading Code for Analyzing Contaminant Migration in
Groundwater
MT3D99 builds on the strengths of the public-domain MT3DMS
code, and includes significant new enhancements to improve performance and
increase the functionality of the MT3D96 and MT3DMS
codes.
Free software upgrade available to registered
MT3D99
users.
The most recent version
of MT3D99
is Service Pack 4.
MT3D99 Enhancements Include:
The iterative
solver is based on generalized conjugate gradient methods with the
highly efficient Lanczos/ORTHOMIN acceleration scheme and enables the
user to solve a wide array of problems using much less computer
time.
The third-order TVD
(total-variation-diminishing) scheme for solving the advection term is
mass conservative and minimizes numerical dispersion and artificial
oscillation. It has been shown to be effective where other
solution techniques fail.
The optional
dual-porosity advection-diffusion model provides a more effective
approach than the standard single-porosity advection-dispersion model
for modeling solute transport in fractured or extremely heterogeneous
porous media.
The nonequilibrium
sorption model enables the user to examine the role of sorption in
solute transport and remediation processes without the restrictive
local-equilibrium assumption. In addition to the first-order
kinetics, MT3D99 supports zero-order and mixed-order Monod
kinetic reactions.
MT3D99
can handle BIOPLUME-type aerobic and anaerobic reactions between
hydrocarbon contaminants and any user-specified electron acceptors, and
parent-daughter chain reactions for inorganic or organic
compounds. This enables MT3D99 to analyze natural
attenuation and bioremediation without using an add-on
package. The multispecies reactions are fully integrated
with the MT3DMS transport solution schemes, including the implicit
solver.
MT3D99
supports a new automatic restart option to greatly facilitate the
continuation of a run from a previous simulation.
MT3D99
computes cell-by-cell mass flux and mass storage terms. This
enables the user to compile a detailed mass budget for any subregion of
the model grid.
MT3D99
includes several useful and flexible postprocessing programs:
PostMT3D/MODFLOW for creating 2D and 3D data files for any graphic and
visualization software package including Surfer and TecPlot; HCOMP for
computing residuals and summary statistics between observed and
model-calculated heads and concentrations; and FBUDGET for calculating
detailed groundwater flow and solute mass budgets in any user-specified
subregion of the model grid.
Why choose MT3D as
your 3D Solute Transport Simulator?
MT3D99
is designed to work directly with the industry-standard groundwater flow
code MODFLOW-88 and MODFLOW-96. Other flow models can also be supported
by modifying the LinkMT3D package for MODFLOW.
MT3D99
combines three major classes of transport solution techniques in a
single code, namely, the standard finite difference method; the particle
tracking based Eulerian-Lagrangian methods; and the higher-order
finite-volume TVD method.
MT3D has been
successfully applied to model thousands of sites and is widely accepted
by regulators and the groundwater consulting and research
community. In addition, MT3D99 is backward compatible
with all previous versions of MT3D, supported by all major graphical
pre- and post-processors.
