WMS:GSSHA Output Control

The Output Control, accessible from the Job Control dialog, is where most of the output options for a GSSHA simulation are set. GSSHA can write out two types of data sets: grid based and link/node (point) based. All of these data sets will be read in to WMS, if they exist, as part of a GSSHA solution.

Gridded Data Sets

Because there are so many gridded data sets that GSSHA can output, they are separated into two categories: General and Nutrients - Overland.

General

• Distributed Rainfall Intensity
• Surface Depth - depth of water on the overland flow plane
• Cumulative Infiltration Depth - if an infiltration option is turned on
• Infiltration Rate - if an infiltration option is turned on
• Surface Soil Moisture - if an infiltration option with soil moisture redistribution is turned on
• Groundwater Elevations (Head)
• Volume suspended sediment
• Sediment Flux - maximum flux on the overland flow plane
• Net Sediment Transfer - erosion/deposition on the overland flow plane
• Flood (max) Depth - values in each grid cell may occur at different time steps

WMS does not currently write the cards and file names associated with these output options to the GSSHA .prj file.

Nutrients - Overland

• Nitrite (NO2-)
• Nitrate (NO3-)
• Ammonium (NH4+)
• Organic Nitrogen
• Organic Phosphorus
• Dissolved Phosphorus
• Algae
• Carbonaceous BOD
• Dissolved Oxygen

Link/Node Data Sets

Link/node data sets report values at the nodes along the links of the GSSHA stream/channel network. The files are written in a format unique to GSSHA.

• Channel Depth
• Channel Flow
• Channel Velocity (average)
• Sediment Flux
• Net Sediment Transfer
• Flood (max) Depth
• Water Surface Elevation
• Pipe Flow
• Pipe Node Depths
• Pipe Node Inflow/Outflow
• Nitrite (NO2-)
• Nitrate (NO3-)
• Ammonium (NH4+)
• Organic Nitrogen
• Organic Phosphorus
• Dissolved Phosphorus
• Algae
• CBOD
• Dissolved Oxygen

WMS does not currently write the cards and file names associated with these output options to the GSSHA .prj file.

Write Frequency

Specify how often to write output values to the grid and the link/node output files. GSSHA will output data for a gridded data set after the first computational time step and then using the specified write frequency. For example, a 2 hour simulation with a time step of 30 seconds and a write frequency of 30 minutes will produce output at 30 seconds, 30 minutes 30 seconds, 60 minutes 30 seconds, and so on. Data for link/node data sets are output before the first computation time step (initial values) and then according to the specified write frequency. Using the previous example link/node data sets are written at 0 seconds, 30 minutes 0 seconds, 60 minutes 0 seconds, and so on.

Gridded Data Set Output Format

• Binary
• ARC/INFO® ASCII
• GRASS ASCII
• XMDF

Hydrograph

GSSHA will output the outlet hydrograph to the .otl file using the specified write frequency. Even though GSSHA performs all computations using metric units, it is possible to have GSSHA output flows to the outlet hydrograph file in either metric or English units.

Other

• Suppress Screen Printing - this option will not show output at each computational time step while GSSHA is running, but can significantly reduce the runtime required for a GSSHA simulation. This option can also be selected in the GSSHA Run Options dialog.
• Strict Julian Dates - write all dates to output files using strict Julian dates

Related Topics

• GSSHA Job Control
• GSSHA Overview
• GSSHA Read Solution