GMS

Advanced Run MODFLOW dialog

By mkennard on July 20, 2016

Typically when you run MODFLOW from GMS, GMS will run the version of MODFLOW specified in the MODFLOW Global/Basic Package dialog (shown below). The available MODFLOW versions in this dialog are those that ship with GMS.

With GMS 10.1 a new way to run MODFLOW from GMS was added. A new option called Use custom Run dialog was added in the MODFLOW Global/Basic Package dialog. With this option turned on, the Run MODFLOW dialog shown below is opened when you run MODFLOW. This dialog lets you pick which version of MODFLOW you want to run, including a custom MODFLOW version not supplied with GMS. It also lets you specify extra command line arguments that your custom MODFLOW may take. All the standard MODFLOW versions that come with GMS are also available and for those versions you can choose Double precision, Parallel, and/or 64 bit. The final command line that GMS will use to launch MODFLOW is displayed at the bottom of the dialog.

The Run MODFLOW dialog can also be accessed directly via a new menu command: MODFLOW | Advanced menu | Run MODFLOW.

This dialog is used in the new "mod-PATH3DU" tutorial, and the new "MODFLOW - Unsupported Packages" tutorial.

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GMS

GMS 10.1: MODFLOW CLN Process

By mkennard on June 21, 2016

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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GMS

3 New Features in GMS 10.1

By mkennard on April 29, 2016

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.