WMS:GSSHA Nutrients

To model nutrients using GSSHA:

1. Toggle on the Nutrients option in the Job Control.
   
   

   
   
   

2. Open the Nutrients dialog to view the four nutrient tabs: Point Sources, Non Point Sources, Other, and Uniform Properties. GSSHA 5.0 currently does not support Point Sources or Non Point Sources, so you can ignore the first two tabs. Enter nutrient concentrations in the Other tab. These concentrations will be applied to rainfall input. The Uniform properties tab contains default values for uniform nutrient properties. You may adjust these values as you see fit.
   
   

   File:NutrientsDialogOther.jpg
   
   

   File:NutrientsDialogUniformProperties.jpg
   
   

3. Create stream and grid index maps. At least one stream and one grid index map is required for nutrient setup.
   
   

   
   
   

4. Set up the initial conditions using the Nutrients map tables in the GSSHA Map Table dialog. The following map tables are supported:
   • Aquatic kinetic constants
   • Dispersion
   • Nitrogen initial conditions
   • Phosphorus initial conditions
   • Carbon initial conditions
   • Other initial conditions
   • Soil nitrogen initial conditions
   • Soil phosphorus initial conditions
   • Soil carbon initial conditions
   • Soil uptake rates
   • Soil/water partitioning
   • Groundwater nitrogen initial conditions
   • Groundwater phosphorus initial conditions
   • Groundwater other initial conditions
5. Turn on any nutrient related output options in the Output Control dialog to view your desired datasets.

Other important troubleshooting notes:

• 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. In this case, all contaminant parameters can be left at 0.
• You must turn on the initial depth option in the job control and specify an initial depth for any initial condition nutrient mapping tables to have any effect
• You 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.

Related Topics

• GSSHA Index Maps
• GSSHA Mapping Tables
• GSSHA Stream Index Maps