TS-CHEM Example Application Series

Creating Zoned Source Areas Using Overlapping Patch Sources
Chemicals leaking from a surface spill to groundwater can create a source area with a “hot spot” center surrounded by a halo of lesser contamination. Several methods can be used to incorporate this type of source in a TS-CHEM model. For example, concentrations across the source area can be averaged, and that average concentration applied to a patch source that extends over the entire source area.

Alternatively, the source can be represented by creating a large lower-concentration patch source to encompass the entire source width, and then adding a second small high-concentration patch representing the hot spot center area. The advantages of this second approach include:

  • Rapidly and efficiently create a zoned concentration source
  • Generate a plume that more accurately represents the downgradient distribution of contamination (because the source is configured more realistically)
  • Evaluate the effect on plume geometry of changes in the width and concentrations of the patch sources used to represent the source area

To explore these source concepts further, and view the plumes that result from these differing source types, download the brief writeup and run the TS-CHEM model files included with the example application.