Difference between revisions of "Model Formulation:Processes Simulated"
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Latest revision as of 20:13, 20 August 2009
GSSHA is a process-based model. Hydrologic processes that can be simulated and the methods used to approximate the processes with the GSSHA model are listed in Table 1. With the exception of channel routing, all processes and approximations in the original CASC2D model are also contained in the GSSHA model. The Preissmann channel routing routine (Cunge et al., 1980) was excluded because of known stability problems with the scheme when simulating trans-critical flows (Mesehle and Holly, 1997). Also, the upwind explicit channel routing method was replaced with a similar up-gradient explicit method.
| Process | Approximation |
|---|---|
| Precipitation distribution |
|
| Snowfall accumulation and melting |
|
| Precipitation interception |
|
| Overland water retention |
|
| Infiltration |
|
| Overland flow routing |
|
| Channel routing |
|
| Reservoir simulation |
|
| Evapo-transpiration |
|
| Soil moisture in the Vadose zone |
|
| Lateral groundwater flow |
|
| Stream/groundwater interaction |
|
| Exfiltration |
|
| Overland Erosion |
|
| Overland Sediment Deposition |
|
| Overland Sediment Routing |
|
| Channel Routing of Fine Sediments |
|
| Channel Routing of Sand |
|
| Reservoir Sources of Sediment |
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| Reservoir Routing for Fines |
|
| Reservoir Routing for Sands |
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| Reservoir Fines Deposition |
|
| Overland Constituent Loading |
|
| Overland Constituent Uptake |
|
| Overland Constituent Transport |
|
| Overland Reactions |
|
| Channel Constituent Loading |
|
| Channel Constituent Transport |
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| Channel Reactions |
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| Reservoir Constituent Loading |
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| Reservoir Constituent Transport |
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| Reservoir Reactions |
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Table 1 – Processes and approximation techniques in the GSSHA model
GA – Green and Ampt (1911), GAR – Green and Ampt with Redistribution (Ogden and Saghafian, 1997), RE – Richards’ equation (1931), ADE – Alternating Direction Explicit (Downer et al., 2000), ADEPC – Alternating Direction Explicit, Predictor-Corrector (Downer et al, 2000).
GSSHA User's Manual
- 2 Model Formulation
- 2.1 Processes Simulated
- 2.2 Time Steps and Process Updates
- 2.3 Inputs
