WMS:GSSHA Nutrients

The GSSHA Nutrients dialog is accessed by turning on Nutrients in the other options section of the GSSHA Job Control Parameters dialog, then clicking Edit parameters... to the right of the option. The following tabs are found in this dialog:

• Point Sources
• Non-Point Sources
• Other
• Uniform Properties

The following buttons are found at the bottom of the GSSHA Nutrients dialog:

• Help – Opens this article in a web browser.
• OK – Saves all changes and closes the GSSHA Nutrients dialog.
• Cancel – Discards all changes and closes the GSSHA Nutrients dialog.

General

There are a number of things that should be kept in mind regarding GSSHA nutrients

• GSSHA nutrients can only be modeled in long-term simulations.
• The contaminants option must be turned on with at least one contaminant in order for nutrients to run. Contaminant parameter values can be left at "0", if desired.
• Turn on Initial depth in the Overland flow section of the GSSHA Job Control Parameters dialog and specify an initial depth for any initial condition nutrient mapping tables to have any effect.
• A project must have at least one ID for all nutrient mapping tables for nutrients to run properly, even if the values for some IDs are all "0".
• Create stream and grid index maps. At least one stream and one grid index map is required for nutrient setup.
• Turn on any nutrient related output options in the GSSHA Output Control dialog to view the desired output datasets.
• For any contaminant source being modeled as a point or non-point contaminant source, define a mass curve or a concentration curve.
• Set up the initial conditions for the stream and grid index maps using the Nutrients map tables in the GSSHA Map Table dialog. The following map tables are supported:
  • Aquatic kinetic constants
  • Dispersion
  • Nitrogen initial conditions
  • Phosphorous initial conditions
  • Carbon initial conditions
  • Other initial conditions
  • Soil nitrogen initial conditions
  • Soil phosphorous initial conditions
  • Soil carbon initial conditions
  • Soil uptake rates
  • Soil/water partitioning
  • Groundwater nitrogen initial conditions
  • Groundwater phosphorous initial conditions
  • Groundwater other initial conditions

Point Sources

The Point Sources tab in the GSSHA Nutrients dialog.

When defining point sources, determine the I, J index of the cell if defining an overland point source, or the Link, Node index if defining a stream point source. The I, J index can be determined from the grid cell properties in the Properties section of the Main Graphics Window. The link number can be determined by turning on the link number display on the Map tab under "Map Data" in the Display Options dialog.

Non-Point Sources

The Non-Point Sources tab in the GSSHA Nutrients dialog.

When defining non-point sources, define a grid or stream index map associated with the non-point source.

Other

Nutrients dialog showing the Other tab.

Enter nutrient concentrations in the Other tab. These concentrations will be applied to rainfall input.

Uniform Properties

Nutrients dialog showing the Uniform Properties tab.

The Uniform properties tab contains default values for uniform nutrient properties. It's possible to adjust these values.