EVS has powerful features for visualizing flow velocities, head gradients, time-series output and mesh geometries from MODFLOW, MT3D and most other commercially available flow and transport programs. The MODFLOW program is used for simulating three-dimensional ground water flow with specified boundary conditions including a free surface (water table). MT3D uses ground water fluxes calculated by MODFLOW to simulate the three-dimensional transport of a single solute undergoing advection, dispersion and chemical reaction processes.
The output of MODFLOW and MT3D is not immediately suitable for input into EVS and therefore must be post-processed into a format usable by Load_EVS_Field in order to be used in EVS. The EFF format is most suitable in that it can preserve layer information and thus allow coloring by layer, exploding layers and specific layer selection. The file structure is more complex than others because it requires describing the nodal connectivity for each cell in the model. The old field file (.fld) is simpler to produce in that the nodal connectivity (definitions of the cells) does NOT have to be explicitly described, however it will not allow the layer manipulations described above nor will it allow the specification of cell data.
This workbook details approach for visualizing the UCD (.inp) format output from MODFLOW and MT3D, as output by Groundwater Vistas. This workbook also assumes that the user has a thorough understanding of the use of both MODFLOW and MT3D. Also, the user should be familiar with all aspects of EVS covered in previous workbooks. Basic EVS functions the user should be comfortable with include:
* Basic network editor functions such as instancing, connecting, and deleting modules.
* Use of Module Control Panels including how to make them visible using the pull down Modules menu.
* Basic viewer operation such as rotating, translating and scaling the transformable objects in the viewer window.
If the user is not familiar with these functions of EVS, they should refer to the previous workbooks to gain a basic understanding of EVS.
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