The Groundwater Modeling System (GMS) is a comprehensive package which provides tools for every phase of a groundwater simulation including site characterization, preprocessing, model development, postprocessing, calibration, and visualization.
Solids -> MODFLOW Command
The Solids -> MODFLOW command represents a powerful tool for modeling complex stratigraphy in a completely grid-independent fashion. As part of the overall conceptual model building process, the stratigraphy at a site is modeled as a set of solids. The solids are built using tools in the Borehole, TIN, and Solids modules. These solids can represent a wide variety of complex stratigraphic relationships. The user then assigns hydraulic conductivity (Kh and Kv) and storage coefficients to the solids as material properties and a multi-layer grid is constructed where the boundary of the grid occupies the same region of the solids in plan view. The Solids -> MODFLOW command can then be used to automatically define the Kh, Kv, top elevation, bottom elevation, and storage coefficient arrays in the MODFLOW BCF package. If the grid is refined or edited in any way, this command can be selected again to rebuild the BCF arrays in seconds with no further user intervention. Together with the feature objects in the Map module, a set of solids can be used to build a completely grid-independent conceptual model regardless of the complexity of the site.
Building the Solids
Before executing the Solids -> MODFLOW command, a set of solids should be constructed that match the site stratigraphy. These solids are typically constructed using boreholes, TINs, and solids as described in the Building Solids and 3D Meshes with TINs topic. When building these solids, it is best to build the TINs using the same outer polygonal boundary that is used to define the MODFLOW conceptual model. This ensures that the stratigraphy model and the feature object portion of the conceptual model match.
Solids -> MODFLOW Options
Once the solids are constructed, the Solids -> MODFLOW command can be selected. This command brings up a dialog listing the three basic options associated
with the Solids -> MODFLOW command. Each option utilizes a different approach for converting the solid stratigraphy to the MODFLOW BCF input
arrays. The three options are:
- Boundary Matching
- Grid Overlay
- Grid Overlay with Keq
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