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Modeler information
First name Fred
Last name Ogden
Type of contact Model developer
Institute / Organization University of Wyoming
Postal address 1 1000 E. Univ. Ave
Postal address 2 Dept. of Civil & Architectural Engineering
Town / City Laramie
Postal code 82071
State Wyoming
Country USA
Email address fogden@uwyo.edu
Phone 307-766-6171
Fax 307-766-2221


Additional modeler information
First name Charles
Last name Downer
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax


Additional modeler information
First name Aaron
Last name Byrd
Type of contact Technical contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax


Model identity
Model type Modular
Spatial dimensions
Spatial extent
Model domain
One-line model description Coupled distributed engineering hydrology, sediment, contaminant fate/transport
Extended model description Gridded Surface Subsurface Hydrologic Analysis (GSSHA) is a grid-based two-dimensional hydrologic model. Features include 2D overland flow, 1D stream flow, 1D infiltration, 2D groundwater, and full coupling between the groundwater, vadoze zone, streams, and overland flow. GSSHA can run in both single event and long-term modes. The fully coupled groundwater to surfacewater interaction allows GSSHA to model both Hortonian and Non-Hortonian basins.

New features of version 2.0 include support for small lakes and detention basins, wetlands, improved sediment transport, and an improved stream flow model. GSSHA has been successfully used to predict soil moistures as well as runoff and flooding.


Model technical information
Supported platforms Unix, Linux, Mac OS, Windows
Other platform
Programming language C++
Other program language
Code optimized
Start year development 1988
Does model development still take place? Yes
If above answer is no, provide end year model development
Model availability As code, As teaching tool, As executable
Source code availability
(Or provide future intension) 		Through owner
Source web address
Program license type Other
Program license type other --
OpenMI compliant No but possible
CCA component No but possible
IRF interface No but possible
Memory requirements Depends on catchment
Typical run time depends on catchment size and process algorithms selected


Input - Output description
Describe input parameters DEM, land-use/land-cover, stream channels, precipitation, soils, aquifer maps. These index maps are used to classify catchment parameters related to overland/channel flow, soil/aquifer hydraulic properties, soil erodibility, contaminant loadings, etc. Model setup is greatly enhanced by the use of the US Dept. of Defense Watershed Modeling System (WMS), which serves as an interface between GSSHA and Arc/Info
Input format ASCII, Binary
Other input format US Dept. of Defense Watershed Modeling System (WMS)
Describe output parameters Flow rates, depths, soil moisture, sediment fluxes, erosion/deposition, contaminant/nutrient fluxes and concentrations, groundwater levels, reservoir storages.
Output format ASCII, Binary
Other output format US Dept. of Defense Watershed Modeling System (WMS)
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? Yes
Describe post-processing software yes, The US Dept. of Defense Watershed Modeling system can produce animations of model outputs. Run summary file includes detailed mass balance information. Output time series can be analyzed using spreadsheet or other software.
Visualization software needed? Yes
If above answer is yes
Other visualization software Dept. of Defense, Watershed Modeling System (WMS)


Process description model
Describe processes represented by the model Processes:
  • Rainfall: gage with nearest neighbor or inverse distance-squared weighting, radar.
  • Interception: empirical model.
  • Infiltration: Green & Ampt, Green & Ampt with redistribution, three-layer Green & Ampt, or Richard's equation.
  • Overland runoff: 2-D finite volume diffusive wave with overland flow dykes and pothole lakes.
  • Channel routing: 1-D dendritic finite-volume diffusive wave with culverts, on-channel lakes, rule curves, rating curves, scheduled releases.
  • Groundwater: 2-D finite-difference with wells and various boundary conditions.
  • Overland erosion: three alternative source equations, raindrop impact, erosion limits, deposition, arbitrary size classes.
  • Channel sediment transport: advection-diffusion for fines, stream power for sands.
  • Fate and transport of conservative and non-conservative

constituents in soil, overland, and channels

Describe key physical parameters and equations Too much to describe in only 500 characters! See: http://www.gsshawiki.com/wiki/index.php5?title=Main_Page
Describe length scale and resolution constraints Dependent upon computational power and memory.
Describe time scale and resolution constraints Dependent upon computational power and memory.
Describe any numerical limitations and issues Explicit finite volume routing formulations are time-step limited.


Model testing
Describe available calibration data sets http://www.gsshawiki.com/wiki/index.php5?title=Main_Page
Upload calibration data sets if available:
Describe available test data sets http://www.gsshawiki.com/wiki/index.php5?title=Main_Page
Upload test data sets if available:
Describe ideal data for testing --


Users groups model
Do you have current or future plans for collaborating with other researchers? The development of GSSHA has been funded by the US Army Corps of Engineers, Engineer Research and Development Center, Vicksburg, Mississippi. GSSHA is being actively used by a number of US Army Corps of Engineers districts.


Documentation model
Provide key papers on model if any Papers:
  • Downer, C.W., and F.L. Ogden, 2006, Gridded Surface Subsurface Hydrologic Analysis (GSSHA) User's Manual, Version 1.43 for Watershed Modeling System 6.1, System Wide Water Resources Program, Coastal and Hydraulics Laboratory, U.S. Army Corps of Engineers, Engineer Research and Development Center, ERDC/CHL SR-06-1, 207 pp.
  • Downer, C.W., and F.L. Ogden, 2004, Appropriate Vertical Discretization of Richard's Equation for Two-Dimensional Watershed-Scale Modelling, Hydrological Processes, 18:1-22.
  • Downer, C.W., and F.L. Ogden, 2004, GSSHA: A model for simulating diverse streamflow generating processes, J. Hydrol. Engrg., 9(3):161-174.
  • Downer, C.W., and F.L. Ogden, 2004, Prediction of runoff and soil moistures at the watershed scale: Effects of model complexity and parameter assignment, Water Resour. Res., 39(3), 10.1029/2002WR001439.
  • Johnson, B.E., and T.K. Gerald, 2006, Development of nutrient submodules for use in the Gridded Surface Subsurface Hydrologic Analysis (GSSHA) Distributed Watershed Model., J. Am. Water Resour. Assn., 42(6):1502-1525.
  • Kalin, L. and M.H. Hantush, 2006, Comparative assessment of two distributed watershed models with application to a small watershed, Hydrol. Processes, 20(11):2285-2307.
  • Levy, J.K., J.E.T. Moncur, and K. Takara, 2006, Introduction: Enhancing the capacity for sustainable watershed management, J. Am. Water Resour. Assn., pp. 1437-1439.
Is there a manual available? Yes
Upload manual if available:
Model website if any http://chl.erdc.usace.army.mil/gssha
Model forum / discussion board


Additional comments
Comments Current version is 4.0


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