Aquaveo & Water Resources Engineering News

MODFLOW-USG Training - Philadelphia

The GMS team recently completed a MODFLOW-USG training course in Philadelphia. Thank you to Dr. Laura Toran for hosting us at Temple University. Alan Lemon, from the GMS development team, and Sorab Panday, principal MODFLOW-USG author, taught the class. The 2 day class was filled with theory and hands on applications with MODFLOW-USG. Course participants were excited to see the new types of grids that can be used with MODFLOW-USG. GMS has many flexible options for creating unstructured grids that make using MODFLOW-USG as easy as using traditional MODFLOW.
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New plot axes in GMS 10.0

The Plot Axes have been overhauled in GMS 10.0. The new axes automatically turn on and off as you rotate the view so that your view is never obscured. The options in the dialog are also much simpler.

GMS Sprint June 2014

  • Fixed three bugs
  • modflow.org complete
  • UGrids added to Display Themes
  • Double-click on UGrid cell opens Properties dialog
  • TINs and Rasters added for SFR2 elevations
  • PEST 13 support added
  • Qt interface progress
  • Posted GMS 10.0 beta
  • 2D UGrid from 3D UGrid
  • UGrid lighting now works
  • UGrid mouse tracking now works
  • Switched from "node" to "point" terminology with UGrids
  • Designed MODFLOW SWI interface
  • UGrid from imported .gsf file
  • PEST-ASP now treated as a MODFLOW package
  • Interpolate from scatter points to UGrid
  • CLN interface started
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GMS Sprint April 2014

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GMS 10.0 - Updated Model Checker

The model checker has been a feature of GMS from the beginning. The purpose of the model checker is to analyze the input data currently defined for a model simulation and report any obvious errors or potential problems. Running the Model Checker successfully does not guarantee that a solution will be correct. It simply serves as an initial check on the input data and can save a considerable amount of time that would otherwise be lost tracking down input errors.

In version 10 the model checker has been updated to make reading its results much easier (see the images below). If GMS does not find any obvious errors or warnings then a message highlighted in Green will appear at the top of the dialog letting you know that the input data is free from obvious errors. If your model contains warnings then a Yellow highlighted message will appear at the top of the dialog telling you that warnings were detected. Then as you scroll through the model checker output the warnings will be highlighted in Yellow. Finally, if your model has errors then a message highlighted in Red appears at the top of the dialog and as you scroll through the output the errors will be highlighted in Red. While these features may not be technological breakthroughs they make using the model checker even easier than previous version of GMS.

MODFLOW-USG Complex Stratigraphy

MODFLOW–USG (for UnStructured Grid), was developed to support a wide variety of structured and unstructured grid types, including nested grids and grids based on prismatic triangles, rectangles, hexagons, and other cell shapes. Flexibility in grid design can be used to focus resolution along rivers and around wells, for example, or to subdiscretize individual layers to better represent hydrostratigraphic units.

MODFLOW-USG’s subdiscretization capability to better represent hydrostratigraphic units is an extremely powerful feature. Traditional MODFLOW requires that grid layers be continuous throughout the model domain even if the particular stratigraphic unit ends or pinches out.

Complex unstructured grids can be created in GMS by using the horizons approach.

There is a new video on the aquaveo youtube channel that highlights this feature. There is also a new tutorial that explains the various options associated with this feature.

Traditional MODFLOW Layering
MODFLOW-USG Layer that pinches out
3D Unstructured Grid generated using the horizons approach

MODFLOW Native Text Format

GMS uses a modified version of MODFLOW that can read data from HDF5 files. HDF5 is a binary, cross-platform file format for storing data. Large portions of the MODFLOW inputs are stored in an HDF5 file when creating a MODFLOW model in GMS. Large MODFLOW models are stored much more efficiently using HDF5 (compression ratios of 95% when compared to text files are common). Also, the read/write times are much faster with the binary HDF5 file when compared to text files.

Even though it has been shown that HDF5 with MODFLOW is extremely efficient, many users would also like to have their MODFLOW simulations in the native MODFLOW format. This is particularly true when completing a modeling project and the user needs to archive the project.

Native MODFLOW text files can be saved from GMS. Beginning with version 10.0, these text files also contain documentation comments that more clearly identify the contents of each line in the MODFLOW input file. Further, parameter definitions are also included in the text files.

There is a new video on the aquaveo youtube channel that highlights this feature. There is also a new tutorial that explains the various options associated with this feature.

GMS Sprint March 2014

  • Fixed four bugs
  • Finished advanced Run MODFLOW dialog
  • Finished improvements to MODFLOW native text
  • Created tutorial on converting existing models to MODFLOW-USG
  • Created MODFLOW-USG tutorial on quad tree refinement around rivers, wells
  • GMS asks user for local or online help preference on first-time help
  • vtu file saved with MODFLOW files
  • Some work on modflow.org
  • New plot axes finished
  • "Ortho" view for UGrids done. Symbols drawn on top when faces are filled
  • Arc and poly refinement attributes added for quadtree refinement
  • Arc and poly refinement works for quadtree UGrids
  • Added command to extrude 2D UGrid to a 3D UGrid
  • Ctrl-click to select UGrid cells now works
  • Disabled dragging UGrid nodes or editing coordinates
  • Cell size now displayed for selected UGrid cell
  • MODFLOW symbols in other layers not displayed when doing single layer
  • MODFLOW-USG arrays work like data sets - show contours
  • F2 edits selected name in Project Explorer
  • CTRL+U unselects all
  • Octree UGrid creation added
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