GMS 10.1: MODFLOW CLN Process

New in GMS 10.1 is support for the CLN (Connected Linear Network) Process of MODFLOW-USG. From the MODFLOW-USG documentation:

The CLN Process was developed for MODFLOW–USG to provide the framework for incorporating one-dimensional connected features into a structured or unstructured threedimensional GWF Process grid. A one-dimensional CLN feature is any hydrogeologic or hydrologic water conveyance feature that has a cross-sectional dimension which is much smaller than the longitudinal flow dimension and the size of the encompassing GWF cell. Flow is computed in the longitudinal direction of the network of connected one-dimensional features using specified cross-sectional properties; flow between CLN cells and GWF cells is computed across the wetted perimeter of the one-dimensional CLN feature. The CLN Process thus provides a mechanism for including features with small cross-sectional areas, relative to GWF cell sizes, without having to build this level of detail into the grid used for the GWF domain.

A new tutorial was created that introduces the CLN process interface in GMS, and a page was added to the wiki. CLN wells can be created a conceptual model, mapped to the grid, and edited on the grid.

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3 New Features in GMS 10.1

GMS 10.1 adds the "Name File" dialog, which adds the following new capabilities:

  • Unsupported packages (packages that don't have an interface in GMS) can be included in the solution and edited in a text editor
  • Unsupported packages can be removed from the simulation
  • Unit numbers are no longer altered by GMS
  • Unit numbers can be set by the user

An example of the Name File dialog in use is shown below. In this example, a MODFLOW-CFP model was imported into GMS. Although GMS does not have an interface for the MODFLOW-CFP packages included in the model, those packages are still part of the simulation and are listed in the dialog. The input files for those packages can be edited from the dialog (using a text editor), or the packages can be removed from the simulation. But there is no need to remove the packages from the simulation because GMS 10.1 comes with a MODFLOW-CFP binary that can read the MODFLOW files that GMS writes. So this model can be run from GMS, and the solution, including the MODFLOW-CFP parts, can be displayed in GMS. This illustrates how GMS 10.1 includes better "support" for unsupported packages.

Name file / unit manager
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GMS Sprint July 2014

  • Released GMS 10.0 with support for MODFLOW-USG
  • Fixed 10 bugs
  • Training course in Adelaide, Australia
  • Parallelized the new interpolation code
  • Switched to new, faster interpolation code for linear and IDW
  • Updated MODFLOW-NWT and MODFLOW-USG to the latest versions
  • Good progress on hypergridtree
  • Added shapefile export for 2D meshes
  • Good progress on BeoPEST support
  • Much code refactoring and cleanup
  • Got better estimates on tutorial durations
  • Investigated recording tutorial videos
  • Added "Z Values -> Dataset" and "Map to Z Values" commands for UGrids
  • Length units are now defaulted to computers current regional settings unless settings have been saved previously
  • CLN Package support completed (non-graphical)
  • Designed interface for MODFLOW-USG Observations
  • Created a "Getting Started" tutorial
  • Added SEAWAT 64-bit executables to Preferences dialog
  • Added Zoom To Extents commands for all geometric objects
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