GSSHA Software Primer

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Welcome to the GSSHA Wiki!

OVERVIEW

This section gives a brief overview of:

• History
• Description
• Process simulated
• Applications
• Modeling process
  

PRE-PROCESSING

This section discusses watershed delineation and grid construction. The six chapters discussed here are:

• Obtaining DEM data for watershed delineation
• Watershed delineation
• Grid sizes
• Constructing a grid
• Conclusions
  

MODEL CONSTRUCTION

This section discusses building a basic GSSHA simulation. The twelve chapters discussed in model construction consist of:

• Global parameters
• Total time
• Time-step
• Outlet information
• Units
• Defining a uniform precipitation event
• Describing overland flow
• Overland flow routing options
• Verifying the basic model
• Editing the grid to correct elevation errors
• Determining an appropriate time-step
• RunningGSSHA
  

CAPABILITIES

This section discusses additional modeling capabilities such as:

• Infiltration
• Channel routing options
• Long-term simulations
• Subsurface features
  

MAPPING

This section discusses how to assign parameter values to individual grid cells. Specifically, the following topics are covered:

• Index maps
• Mapping tables
• Assigning uniform parameters
• Assigning spatially distributed parameters
  

ROUTING

This section discusses lake and channel routing. The topics discussed here include:

• Links and nodes
• Defining stream networks with feature objects
• Link types
• Node spacing
• Smoothing the profile
• Troubleshooting channel routing problems
• Tips on creating lakes
  

EMBANKMENTS

This section discusses:

• Embankment arcs in WMS
• Embankment arcs in GSSHA
• Summary
  

WETLANDS

This section discusses:

• Wetlands conceptual model
• Wetlands setup
  

RAINFALL

This section discusses spatially and temporally varying rainfall. It covers two chapters:

• Temporally varying, spatially uniform rainfall
• Temporally varying multiple gage rainfall
  

LONG-TERM SIMULATIONS

This section contains five subtopics:

• Global parameters
• Infiltration model
• Evapotranspiration model
• Hydrometeorological data
• Rainfall data
  

SATURATED FLOW

This section discusses modeling two-dimensional, saturated, lateral groundwater flow. It includes a discussion of:

• Global parameters
• Distributed parameters
• Boundary conditions
  

RICHARDS' EQUATION

This section discusses modeling the unsaturated zone with the Richards' Equation. It includes the following subsections:

• Global parameters
• Distributed parameters
• Soil depth and discretization
  

POST-PROCESSING

This section discusses:

• Output control
• Data tree
• Visualizing results

REFERENCES

This section contains a list of references used to compile the GSSHA Software Primer.