SEEP2D - Seepage Analysis Model!

RT3D - Bioremediation Simulation Model!

- Imports/exports raster and vector GIS data from ARC/INFO, ArcView, and GRASS.
- A Model Checker is provided for each model to check for potential problems prior to saving and running a model.
- All models can be launched from a GMS menu.
- Latest versions of all analysis codes are provided including executable, source code, and documentation.
- Time-series plots of computed values at selected points can be generated.
- Data Calculator can be used to combine data sets using any mathematical expression to generate a new data set.
- Highly-acclaimed technical documentation including an extensive reference manual and self-guided tutorials.
- Images can be copied to the clipboard and pasted into other applications for report generation.
- Drawing tools are provided for adding titles, arrows, and other annotations to a plot.
- Imports/exports DXF files including AutoCAD R13 format.
- Periodic free software updates are available over the Internet.
- The GMS electronic mailing list can be used for questions and to share tips with hundreds of other GMS users.
- PC and UNIX versions are identical.

Input data may be imported or interpolated from a sparse set of scattered data points. GMS provides a user-friendly graphical interface to the popular MODFLOW model. This interface is used to assign boundary conditions and analysis parameters to the grid to be modeled. Existing MODFLOW input data files can be input directly. The MODFLOW model is also included.

The chemical reactions modeled by MT3D include equilibrium-controlled linear and non-linear sorption and first-order irreversible decay and biodegradation. The GMS MT3D Interface Module provides a user-friendly graphical interface to the popular MT3D contaminant transport model. This Interface is used to assign boundary conditions and analysis parameters to the grid to be modeled. The MT3D model is also included.

Transient data (such as recharge or well pumping), which is typically available in hydrograph form, can be input and edited graphically. This data can then be interactively assigned to a single element or a series of elements. The FEMWATER Interface Module provides a user-friendly graphical interface to the FEMWATER 3D flow and contaminant transport model. This Interface is used to assign boundary conditions and analysis parameters to the 3D finite-element mesh to be modeled. The FEMWATER model is also included.

SEEP2D is a steady-state flow model and will compute the flow value at each node of the finite-element mesh. From these values, flow lines and equipotential lines are plotted showing the resulting seepage flow net. The SEEP2D Interface Module provides a user-friendly graphical interface to the SEEP2D 2-D flow model. This Interface is used to assign boundary conditions and analysis parameters to the finite-element mesh to be modeled. The SEEP2D model is also included.

Once the conceptual model has been defined, GMS will construct a grid, automatically refined around the wells, with the cells outside the model boundary already inactivated. The defined modeling data is then superimposed onto the grid with the appropriate parameters. For example, conductances assigned to polylines such as drains and rivers are automatically computed according to the length of the polyline segment within each cell. At this point, the model is completely defined and no cell editing is required. If the user decides to change the conceptual model (move a boundary, add additional wells, etc.), these changes can be made quickly. Drawing tools are also provided within the Map Module. These tools allow the user to draw text, lines, polylines, arrows, rectangles, etc., in order to add annotation to the graphical representation of the model. In addition, GIS data can be directly imported from or exported to ARC/INFO, ArcCAD, and ArcView.

Interpolation is useful for setting up input data for analysis codes. For example, interpolation can be used to generate transmissivities for a layer of a 3D grid as input to a MODFLOW simulation. Interpolation is also useful for 2D plume mapping.

Three-dimensional interpolation is useful for setting up input data for analysis codes. For example, a set of initial conditions (head and/or concentrations) must be defined for each node in the 3D mesh before a simulation can be performed. Three-dimensional interpolation can be used to generate a data set to be used for initial conditions from a limited set of measured scatter points. Three-dimensional interpolation is also useful for site characterization.

Data sets can be used to represent a variety of types of information. They can represent total heads computed by a groundwater model or starting heads used as initial conditions for input to a transient groundwater model. Data sets can be imported from a file or they can be created by interpolating from a group of scatter points.

In some cases it is necessary to perform mathematical operations on data sets. This can be accomplished in GMS using the Data Calculator. For example, to compare the difference in the solutions from two separate simulations on a finite-difference grid, the two solutions can be input as data sets and the Data Calculator can be used to compute the absolute value of the difference between the two data sets. The resulting data set can be contoured or used to display isosurfaces.

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