Capabilities:Additional Modeling Capabilities
As described in Chapter 1, there are many modeling options in GSSHA beyond the basic overland flow model described in Chapter 3. This chapter summarizes and describes the additional modeling options in GSSHA. More detailed descriptions of some modeling options are offered in following chapters, as needed.
The processes GSSHA simulates to predict stream flow may include overland flow, spatially and temporally varied rainfall, infiltration, and channel routing. It is typical to use the long-term model to conduct simulation calibration or to simulate extended events. Modeling of the unsaturated zone with Richards’ equation and saturated groundwater modeling may be required in areas where infiltration-excess runoff is not the predominate stream-flow producing mechanism. Sediment routing is an additional capability used in studies specifically designed to compute sediment loads.