Model:RHESSys

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Modular Model part of larger framework Incorporated models or components: Spatial dimensions 2D Spatial extent Watershed-Scale Model domain Terrestrial, Hydrology One-line model description Regional Hydro-Ecologic Simulation System Extended model description RHESSys is a GIS-based, hydro-ecological modelling framework designed to simulate carbon, water, and nutrient fluxes. By combining a set of physically-based process models and a methodology for partitioning and parameterizing the landscape, RHESSys is capable of modelling the spatial distribution and spatio-temporal interactions between different processes at the watershed scale. Keywords: biogeochemistry, water quality, C-cycle, Carbon, Nutrient cycle, First name christina Last name Tague Type of contact Model developer Institute / Organization University of California, Santa Barbara Postal address 1 Bren Hall 4516 Postal address 2 Town / City Santa Barbara Postal code 93106 State California Country United States Email address ctague@bren.ucsb.edu Phone 805-893-8579 Fax 805-893-7612 First name Janet Last name Choate Type of contact Model developer Institute / Organization University of California, Santa Barbara Postal address 1 Bren Hall 4516 Postal address 2 Town / City Santa Barbara Postal code 93106 State California Country United States Email address jchoate@bren.ucsb.edu Phone Fax Supported platforms Unix, Linux, Mac OS Other platform Programming language C Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 1991 Does model development still take place? Yes If above answer is no, provide end year model development Code development status Active When did you indicate the 'code development status'? 2020 Model availability As code Source code availability (Or provide future intension) Through web repository Source web address http://fiesta.bren.ucsb.edu/~rhessys/setup/downloads/downloads.html Source csdms web address Program license type Other Program license type other NOT SURE Memory requirements -- Typical run time -- Describe input parameters Input Data needed: required and optional (based on project needs and data availability): Spatial data (GIS maps) - to be brought into GRASS GIS Basic requirements: DEM (Digital Elevation Model) Optional: Stream network, stream gage locations Meteorological station locations Vegetation and soil type, LAI Road network, landcover/landuse (eg. residential, agricultural, open space, etc...) Snow redistribution Timeseries data - natural and human induced inputs as text files: Basic requirements: Daily Precipitation (Meters) Daily Maximum Temperature (°C) Daily Minimum Temperature (°C) Optional: Day length (seconds) Duration of rainfall (hours) Zone and seasonal scaling of LAI (unitless) Incoming longwave radiation (KJ/(meters2)/day) Incoming direct shortwave radiation (KJ/(meters2)/day) Incoming diffuse shortwave radiation (KJ/(meters2)/day) Nitrogen deposition as NO3 (kg/(meters2)/day) Nitrogen deposition as NH4 (kg/(meters2)/day) Incoming direct PAR radiation (KJ/(meters2)/day) Incoming diffuse PAR radiation (KJ/(meters2)/day) Relative humidity (Range (0-1)) Mean daytime temperature (°C) Night time temperature at sundown (°C) Soil temperature (°C) Vapour pressure deficit (Pa) Wind speed (meters/sec) Carbon dioxide (CO2) (parts per million/year) Input format ASCII, Binary Other input format Describe output parameters -- Output format ASCII, Binary Other output format Pre-processing software needed? Yes Describe pre-processing software Associated with the RHESSys simulation are a number of interface programs which organize input data into the format required by the RHESSys simulation model. These include a standard GIS-based terrain partitioning program, r.watershed, and other basic GIS routines as part of the GRASS GIS system and two RHESSys specific programs: GRASS2WORLD (derives landscape representation from GIS images) CREATE_FLOWPATHS (establishes connectivity between spatial units) Post-processing software needed? Yes Describe post-processing software Converting RHESSys Output to Spatial Output Using rh rh is a command line program developed to convert RHESSys model output to spatial output. The spatial output can be formatted for viewing in either GRASS or ArcView. Requirements rh must be run from inside the GRASS GIS system. To run rh the user must first output the patch map layer into either an ascii text file for GRASS or an ascii text file for Arc/INFO or ArcView. Visualization software needed? Yes If above answer is yes ESRI Other visualization software GRASS Describe processes represented by the model The original process models include the following: The MTN-Clim model (Running et al, 1987) uses topography and user supplied base station information to derive spatially variable climate variables such as radiation and to extrapolate input climate variables over topographically varying terrain. An ecophysiological model is adapted from BIOME-BGC (Running and Coughlan, 1988; Running and Hunt, 1993) to estimate carbon, water and potentially nitrogen fluxes from different canopy cover types. Distributed hydrologic models – The original RHESSys utilized a single approach, TOPMODEL, to model soil moisture redistribution and runoff production. We now include two approaches: TOPMODEL (Beven and Kirkby, 1979) is a quasi distributed model. TOPMODEL distributes hillslope soil moisture based on a distribution of a topograhically defined wetness index. An explicit routing model is adapted from DHSVM (Wigmosta et al., 1994) which models saturated subsurface throughflow and overland flow via explicit connectivity. An important modification from the grid-based routing in DHSVM is the ability to route w ater between arbitrarily shaped surface elements. This allows greater flexibility in defining surface patches and varying shape and density of surface tesselation. Describe key physical parameters and equations --- Describe length scale and resolution constraints -- Describe time scale and resolution constraints -- Describe any numerical limitations and issues -- Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets See uploaded data file (Data.tar); or visit: http://fiesta.bren.ucsb.edu/~rhessys/setup/downloads/source.shtml Upload test data sets if available: Media:Data.tar Describe ideal data for testing Do you have current or future plans for collaborating with other researchers? -- Is there a manual available? Yes Upload manual if available: Media:Tutorials RHESSys.tar Model website if any http://fiesta.bren.ucsb.edu/~rhessys/index.html Model forum / discussion board RHESSys source code and various user support programs are freely available for download. Limited documentation is also available on the website. We do not have the resources, however, to freely provide technical support for new users. Workshops are periodically available. If you would like additional training, technical support or information on hosting a RHESSys workshop, etc., we may be able to provide this on a contractual basis - Please contact Christina Tague (ctague@bren.ucsb.edu) or Janet Choate (jchoate@bren.ucsb.edu) for more information. Comments To run RHESSys successfully, the user will need to invest quite a bit of time gathering both spatial and observed data, which may require additional work to format the data correctly. A sample dataset can be downloaded with tutorials to familiarize users with the data and formats required in order to run RHESSys. This part will be filled out by CSDMS staff OpenMI compliant No but possible BMI compliant No but possible WMT component No but possible PyMT component Can be coupled with:

Model info Authors christina Tague Choate Source code Go to external source code site Model citations Citation indices RHESSys Nr. of pubs: 121 Citations: 4454 h-index: 35 QR-code Link to this page Other models by author RHESSys

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Citation indices	RHESSys
Nr. of pubs:	121
Citations:	4454
h-index:	35

Featured publication(s)	Year	Model described	Type of Reference	Citations
Tague, C. L.; Band, L. E.; 2004. RHESSys: Regional Hydro-Ecologic Simulation System—An Object-Oriented Approach to Spatially Distributed Modeling of Carbon, Water, and Nutrient Cycling. Earth Interactions, 8, 1–42. 10.1175/1087-3562(2004)82.0.CO;2 (View/edit entry)	2004	RHESSys	Model overview	290
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