GMS:MODPATH Display Options

A set of display options unique to the MODPATH input data and MODPATH solutions is provided in GMS. These options are accessed through the Display Options command in the MODPATH menu. This command is only available if a MODFLOW simulation exists. This command brings up the Particles tab of the 3D Grid Display Options dialog. The following table describes the display options available for the MODPATH model.

Display Option	Description
Starting locations	The starting locations for the particles can be turned on and off. The symbol style, color and size can also be adjusted.
Starting location indices	The starting locations indices for the particles can be turned on and off. The font style, color and size can also be adjusted.
Ending locations	The ending locations for the particles can be turned on and off. The symbol style, color and size can also be adjusted.
Pathlines	The pathlines can be toggled on and off, and the pathline style and color can be adjusted. The pathline color can be set to the default color, or the color corresponding to the starting or ending zone codes of the pathlines.
Direction arrows	Direction arrows can be displayed along the pathlines. The size of the arrow heads can be set by specifying the Length in pixels. The arrows are displayed along the pathline at an interval corresponding to the Length specified.
Zone codes	Colors can be associated with zone codes. If the Auto compute colors option is selected, GMS will automatically pick colors to go with each unique zone code. Otherwise, you can specify the color you want to associate with each zone code. These colors are used if the Pathline Color option is set to Starting zone code or Ending zone code.
Capture zones	GMS groups pathlines together into capture zones. A polygon representing the outer boundary of the pathlines is found and can be outlined, or filled. The following options are available relating to the capture zones: Delineate by well With this option, all the pathlines originating from a cell containing a well will be grouped together into one capture zone. All wells with the same name are included in the same capture zone. Delineate by zone code With this option, all pathlines originating from the same zone code are grouped together into capture zones. This option could be used to create a single capture zone for several wells that have different names. The cells containing the wells would need to be assigned the same zone code. This option could also be used to find the "capture zone" for a zone of cells where the cells all have the same zone code. Thin triangle ratio GMS triangulates the pathlines in a capture zone to determine the capture zone boundary. Depending on the length and shape of the pathlines, it may be necessary to adjust the Thin triangle ratio to get a good looking capture zone. Increasing the value causes more area around the edges to be included. Decreasing the value causes less area around the edges to be included.

Exporting Pathlines as a Shapefile

• 1. Right click in the white space below the items in the project explorer and select Convert to CAD
• 2. Right click on the CAD folder and select CAD to | Feature Objects
• 3. Deselect all but the appropriate MODPATH layers (Modpath_CaptureZones, PSET_particle set_paths, and PSET_particle set_starts most likely)

NOTE: A new coverage will be created (called CAD Layers by default) under the Map Data folder in the map module.

• 4. Right click on the new coverage (CAD Layers by default) and select Export
• 5. specify the filename, and click Save