GMS:Building a SEAWAT Model

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Model Info
Model type 3D Flow and Transport Model
Developer USGS
Documentation SEAWAT Manual
Tutorials SEAWAT Tutorials

Grid Approach

Although it is not always the most efficient approach, a SEAWAT simulation can be completely defined using only the tools in the 3D Grid module. To build a SEAWAT model with this approach, first create a MODFLOW model using the grid approach. If using transport, an MT3DMS model is then created, and then a SEAWAT model is created. For each of the three models the properties and concentrations at sources/sinks are assigned directly to the cells. Any SEAWAT MODFLOW AUX variables are assigned using the MODFLOW package dialogs. SEAWAT specific packages can be set using the VDF or VSC package dialogs.

Conceptual Model Approach

To create a SEAWAT using a conceptual model:

  1. Construct a MODFLOW conceptual model, create a grid, and convert the conceptual model data to the MODFLOW data defined at the grid cells.
  2. Run the MODFLOW simulation to make sure it is working properly.
  3. If the simulation includes transport, return to the Map module. Edit the properties of the conceptual model to include transport. Assign concentrations to the sources/sinks in the conceptual model where necessary. Also define polygonal zones describing layer data including porosity, longitudinal dispersivity, sorption constants, rate constants, and bulk density.
  4. Select the Feature Objects | Map → MT3DMS command to automatically assign the MT3DMS data to the appropriate cells in the grid.
  5. Enable SEAWAT in the Model Interfaces dialog and create a SEAWAT simulation.
  6. Edit the MODFLOW AUX variables, VDF, and VSC packages if necessary.
  7. Use the SEAWAT model checker to check the simulation for any errors or warnings.

See also