EMS-I GMS 5.0 DATECODE 09282004

EMS-I GMS 5.0 DATECODE 09282004
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GMS is the most sophisticated and
comprehensive groundwater modeling
software available! Used by thousands of
people at U.S. Govement agencies,
private firms, and inteational sites
in over 90 countries, it has been proven
to be an effective and exciting modeling
system. GMS provides tools for every
phase of a groundwater simulation
including site characterization, model
development, calibration,
post processing, and visualization. GMS
supports both finite difference and
finite element models in 2D and 3D
including MODFLOW 2000, MODPATH,
MT3DMS/RT3D, SEAM3D, ART3D, UTCHEM,
FEMWATER, PEST, UCODE, MODAEM and
SEEP2D. Regardless of your modeling
needs, GMS has the tools!

The program.s modular design enables the
user to select modules in custom
combinations, allowing the user to
choose only those groundwater modeling
capabilities that are required.
Additional GMS modules can be purchased
and added at any time. The software will
dynamically link to these subsequent
modules at run time.automatically adding
additional modeling capability to the
software.



Groundwater Flow Transport Options

The variety of modeling options in GMS
is unparalleled! Rather than being
limited to one main model (such as
MODFLOW) and accompanying .add on.
codes, GMS provides interfaces to a wide
range of 2D or 3D models. Here is a
brief overview of the options available
to you:

2D Flow
Perform fast, easy modeling with the
MODAEM analytical element model
integrated into GMS! 2D finite element
seeepage modeling is supported in the
SEEP2D model perfect for dams, levees,
cutoff trenches, etc.

3D Flow
3D finite difference modeling with
MODFLOW 2000 (saturated zone) 3D
finite element modeling with FEMWATER
(saturated and unsaturated zone)

Solute Transport
Simple analytical transport modeling
with ART3D Simple 3D transport with
MT3D, MODPATH, or FEMWATER Reactive 3D
transport with RT3D or SEAM3D
Multi phase reactive transport with
UTCHEM

Unsaturated Zone Flow and Transport
Fully 3D unsaturated/saturated flow and
transport modeling with FEMWATER or
UTCHEM



GIS based Model Conceptualization

One of GMSs greatest strengths
traditionally has been the conceptual
model approach. This approach makes it
possible to build a conceptual model in
the GMS Map Module using GIS feature
objects (points, arcs, and polygons).
The conceptual model defines the
boundary conditions, sources/sinks, and
material property zones for a model. The
model data can then be automatically
discretized to the model grid or mesh.
The conceptual model approach makes it
possible to deal with large complex
models in a simple and efficient manner.

The GIS Module now available in GMS has
made creating conceptual models from GIS
data even easier. With direct linkage to
ArcGIS and almost any format of GIS
data, you can access geometry and
attributes faster than ever before.

Whether the GIS data is created in GMS
or imported from GIS files, the method
of model building remains the same. You
edit the model at a GIS object level and
let GMS do the hard work of grid or mesh
building and parameter assignment to
each element of the model.



3D Model Conceptualization

GMS presents new and improved tools for
the creation of complex 3D stratigraphy
models and the ability to translate that
3D object direclty to a
finite difference grid model or
fininte element mesh model.

The .Horizons. approach allows you to
create complex solids from borehole and
cross section data quickly and easily.
These tools alow you to create solids
with complex stratigraphy such as pinch
out zones, truncations, and outcroppings.



You can transfer the results (material
properties) of a solid model direclty to
a numerical model such as a MODFLOW grid
or a FEMWATER mesh. You can also
direclty generate MODFLOW 2000 HUF data
GMS is the only system that allows you
to do this!



Site Visualization

GMS is a powerful graphical tool for
model creation and visualization of
results. Models can be built using
digital maps and elevation models for
reference and source data. During the
model building process, the graphical
representation of the model allows quick
review and presentation of your work.
Fully 3D views, with contouring and
shading, of your model allow anyone to
see and understand the domain and
parameters of your analysis.


A groundwater model can be displayed in
plan view or 3D oblique view, and
rotated interactively. Cross sections
and fence diagrams may be cut
arbitrarily anywhere in the model.
Hidden surface removal, and color and
light source shading can be used to
generate highly photorealistic rendered
images. Contours and color fringes can
be used to display the variation of
input data or computed results.
Cross sections and iso surfaces can be
interactively generated from 3D meshes,
grids, and solids, allowing the user to
quickly visualize the 3D model.


Both steady state and transient
solutions can be displayed in an
animated format (as if viewing a movie)
using either vector, iso surface, color
fringe, or contour animation. For
example, animation of a transient
solution allows the user to observe how
head, drawdown, velocity, and
contaminate concentration vary with
time. In addition, GMS can also sweep an
iso surface through the 3D model. The
minimum and maximum iso surface values
are determined from the model and the
program will then linearly interpolate
and display multiple iso surfaces in
rapid succession. This allows the user
to quickly understand the spatial
variation of a contaminant plume, for
example.



Risk Assessment (Stochastic) Modeling

One of the most exciting features in GMS
is a suite of tools for performing
stochastic simulations with MODFLOW and
accompanying transport models.

The Risk Analysis Wizard is a new tool
associated with the stochastic modeling
tools in GMS. Two types of analysis are
currently supported: probabilistic
threshold analysis and probabilistic
capture zone delineation. This wizard
allows you to quantify the risk of a
contaminant exceeding critical levels in
groundwater or the risk of a capture
zone including key areas at a site.
Such analysis helps determine
appropriate action to be taken in design
or remediation.

Two approaches are supported for setting
up stochastic simulations: parameter
randomization and indicator simulation.
The parameter randomization can be done
using either a .Monte Carlo. or a .Latin
Hypercube. approach. The indicator
simulation approach randomizes the
spatial distribution of the parameter
zones using the T PROGS software. The
T PROGS software is used to perform
transition probability geostatistics on
borehole data. The output of the T PROGS
software is a set of N material sets on
a 3D grid. Each of the material sets is
conditioned to the borehole data and the
materials proportions and transitions
between the boreholes follows the trends
observed in the borehole data. These
material sets can be used for stochastic
simulations with MODFLOW.




Automated Model Calibration

Calibration is the process of modifying
the input parameters to a groundwater
model until the output from the model
matches an observed set of data. GMS
includes a suite of tools to assist in
the process of calibrating a groundwater
model to point and/or flux observations.
When a computed solution is imported to
GMS, the point and flux residual errors
are plotted on a set of calibration
targets and a variety of plots can be
generated showing overall calibration
statistics. Most of the calibration
tools can be used with any of the models
in GMS.



Automated parameter estimation is
supported in GMS for the MODFLOW
simulations using MODFLOW PES, PEST, and
UCODE. These are sometimes called
"inverse models". Most of the steps
involved in setting up an inverse model
in GMS are the same regardless of the
selected inverse model. The basic
process for inverse modeling is: Build a
base model with MODFLOW Input observed
data (point or flux data) Indicate the
model input parameters that the inverse
model can adjust to make the model match
the observations. Let the inverse model
run it will adjust input parameters
and run the MODFLOW simulation
repeatedly until the best match betweeen
computed data and observed data is
obtained.



You can transfer the results (material
properties) of a solid model direclty to
a numerical model such as a MODFLOW grid
or a FEMWATER mesh. You can also
direclty generate MODFLOW 2000 HUF data
GMS is the only system that allows you
to do this!

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