Model:WEPP

Contact

Name	Dennis Flanagan
Type of contact	Project manager
Institute / Organization	USDA-Agricultural Research Service
Postal address 1	National Soil Erosion Research Laboratory
Postal address 2	275 S. Russell Street
Town / City	West Lafayette
Postal code	47907-2077
State	Indiana
Country	USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property.
Email address	flanagan@purdue.edu
Phone	765-494-7748
Fax	765-494-5948

Name	Jim Frankenberger
Type of contact	Technical contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
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WEPP

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Summary Also known as Model type Modular Model part of larger framework Note on status model Date note status model Technical specs Supported platforms Unix, Linux, Windows Other platform Programming language Fortran77, Fortran90 Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 1985 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code, As teaching tool, As executable"As executable" is not in the list (As code, As teaching tool) of allowed values for the "Model availability" property. Source code availability (Or provide future intension) Through owner"Through owner" is not in the list (Through web repository, Through CSDMS repository) of allowed values for the "Source code availability" property. Source web address Source csdms web address Program license type Other Program license type other -- Memory requirements -- Typical run time <1 minute for hillslope simulations In/Output Describe input parameters Daily climate input (temperatures, precipitation depth, duration, Tp, Ip, wind info); slope input (distance downslope, slope at points, profile width, aspect); soil input (infiltration & erodibility parameters, soil layer depth, texture, organic matter, CEC, etc.; cropping/management input - plant growth parameters, residue decomposition parameters, tillage operation parameters, residue management parameters, dates of operations (planting, harvest, tillage, residue management, etc.); irrigation input - type of irrigation, date(s) of irrigation, application rates, etc.; channel parameters input - channel shape, width, slope, roughness, etc.; impoundment parameters input - type of impoundment (1. Drop Spillway 2. Perforated Riser 3. Culvert 4. Emergency Spillway or Open Channel 5. Rock Fill Check Dam 6. Filter Fence / Straw Bales / Trash Barriers 7. User Specified Stage-Discharge Relationship, parameter inputs specific to each impoundment type; watershed structure file - describes how all hillslopes, channels, and impoundments in a watershed are linked. Input format ASCII Other input format Describe output parameters Storm, monthly, yearly, or average annual runoff, soil loss, and sediment yield from a hillslope profile. Spatial distribution of soil erosion and deposition on slope profiles. Graphical output available of 92 parameters from continuous model simulations (including precip, temperatures, runoff, soil loss, sediment yield, biomass production, residue cover, etc.). Soil output text file, water balance output text file, plant output text file, storm event output file, overland flow element summary line output file. Output format ASCII Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software WEPP Windows or web-based interfaces can be used without any other software, besides that included in the model installation (or with web-browser for the browser interfaces). GeoWEPP requires ArcView or ArcGIS as the GIS system. Visualization software needed? No If above answer is yes ESRI Other visualization software Process Describe processes represented by the model Climate generation (CLIGEN), infiltration, percolation, evapotranspiration, plant growth, residue management and decomposition, runoff, hydralics of overland flow, soil detachment by raindrop impact and shallow flow (interrill), soil detachment by excess flow shear stress (rill, channel), sediment transport, sediment deposition, irrigation, winter processes (snow melt, frost, thaw), channel erosion processes, sedimentation in impoundments. Describe key physical parameters and equations Rain storm depth, storm duration, storm intensity - driving variables; effective hydraulic conductivity - controls infiltration into soil; baseline soil erodibility parameters (interrill erodibility, rill erodibility, critical hydraulic shear stress) - control soil detachment rates; slope inputs - control amount of flow shear stress and sediment transport capacity available to detach and tranport soil/sediment; plant growth parameters - control the production of biomass that protects soil surface; residue decomposition parameters - control the rate of residue loss from soil surface; tillage operation parameters - control the amount of soil disturbance and burial of residue - both of which impact the adjusted erodiblities for a given day. Describe length scale and resolution constraints Hillslope simulations are recommended for lengths not greatly exceeding 100 meters. Watershed simulations should not exceed areas above 260 hectares. Larger areas can be simulated for hillslope spatial analyses only - but the channel processes will not be accurate at these larger scales. Describe time scale and resolution constraints The model can be run for a single storm (minutes to hours), and can also be run in continuous simulation mode for any number of years (1 - 100+). Describe any numerical limitations and issues Testing Describe available calibration data sets Data available from 1986-88 field experimentation (in compendium) using rainfall simulation. Also, validation data sets are available from USLE database. Upload calibration data sets if available: Describe available test data sets Upload test data sets if available: Describe ideal data for testing Ideal data would consist of breakpoint (recording raingage) rainfall data, observed temperatures, radiation, wind, plant cover, residue cover, storm runoff, storm sediment loss, etc. Other Do you have current or future plans for collaborating with other researchers? Yes Is there a manual available? Yes Upload manual if available: Model website if any http://www.ars.usda.gov/Research/docs.htm?docid=10621 Model forum / discussion board Comments -- WEPP Introduction History Papers WEPP Questionnaire Contact Information Model: WEPP Contact person: Dennis Flanagan (Project Manager) Institute: USDA-Agricultural Research Service City: West Lafayette, Indiana Country: USA Email: flanagan@purdue.edu 2nd person involved: Jim Frankenberger (Technical contact) 3rd person involved: -- Model Description Model type: Modular model for the terrestrial and hydrologocial domain. Description: The Water Erosion Prediction Project (WEPP) model is a process-based, distributed parameter, continuous simulation erosion prediction model for application to hillslope profiles and small watersheds. Interfaces to WEPP allow its application as a stand-alone Windows program, a GIS-system (ArcView, ArcGIS) extension, or in web-based links. WEPP has been developed since 1985 by the U.S. Department of Agriculture for use on croplands, forestlands, rangelands, and other land use types. Technical information Supported platforms: UNIX, Linux, Windows Programming language: Fortran77, Fortran90 Model development started at: 1985 and development still takes place. To what degree will the model become available: Source code & executable will be available and model can be used as teaching tool. Code will be available for collaborators. Current license type: -- Memory requirements: -- Typical run time: <1 minute for hillslope simulations Input / Output description Input parameters: Daily climate input: (temperatures, precipitation depth, duration, Tp, Ip, wind info) slope input: (distance downslope, slope at points, profile width, aspect) soil input: (infiltration & erodibility parameters, soil layer depth, texture, organic matter, CEC, etc. cropping/management input: (plant growth parameters, residue decomposition parameters, tillage operation parameters, residue management parameters, dates of operations (planting, harvest, tillage, residue management, etc.)) irrigation input: (type of irrigation, date(s) of irrigation, application rates, etc.) channel parameters input: (channel shape, width, slope, roughness, etc.) impoundment parameters input: (type of impoundment (1. Drop Spillway 2. Perforated Riser 3. Culvert 4. Emergency Spillway or Open Channel 5. Rock Fill Check Dam 6. Filter Fence / Straw Bales / Trash Barriers 7. User Specified Stage-Discharge Relationship, parameter inputs specific to each impoundment type)) watershed structure file: (describes how all hillslopes, channels, and impoundments in a watershed are linked). Input format: ASCII Output parameters: Storm, monthly, yearly, or average annual runoff, soil loss, and sediment yield from a hillslope profile. Spatial distribution of soil erosion and deposition on slope profiles. Graphical output available of 92 parameters from continuous model simulations (including precip, temperatures, runoff, soil loss, sediment yield, biomass production, residue cover, etc.). Soil output text file, water balance output text file, plant output text file, storm event output file, overland flow element summary line output file. Output format: ASCII Post-processing software (if needed): No, WEPP Windows or web-based interfaces can be used without any other software, besides that included in the model installation (or with web-browser for the browser interfaces). GeoWEPP requires ArcView or ArcGIS as the GIS system. Visualization software (if needed): Yes, ESRI. Process description Processes represented by model: Climate generation (CLIGEN), infiltration, percolation, evapotranspiration, plant growth, residue management and decomposition, runoff, hydralics of overland flow, soil detachment by raindrop impact and shallow flow (interrill), soil detachment by excess flow shear stress (rill, channel), sediment transport, sediment deposition, irrigation, winter processes (snow melt, frost, thaw), channel erosion processes, sedimentation in impoundments. Key physical parameters & equations: Rain storm depth, storm duration, storm intensity - driving variables; effective hydraulic conductivity - controls infiltration into soil; baseline soil erodibility parameters (interrill erodibility, rill erodibility, critical hydraulic shear stress) - control soil detachment rates; slope inputs - control amount of flow shear stress and sediment transport capacity available to detach and tranport soil/sediment; plant growth parameters - control the production of biomass that protects soil surface; residue decomposition parameters - control the rate of residue loss from soil surface; tillage operation parameters - control the amount of soil disturbance and burial of residue - both of which impact the adjusted erodiblities for a given day. Length scale & resolution constraints: Hillslope simulations are recommended for lengths not greatly exceeding 100 meters. Watershed simulations should not exceed areas above 260 hectares. Larger areas can be simulated for hillslope spatial analyses only - but the channel processes will not be accurate at these larger scales. Time scale & resolution constraints: The model can be run for a single storm (minutes to hours), and can also be run in continuous simulation mode for any number of years (1 - 100+). Numerical limitations and issues : -- Testing Available calibration data sets: Data available from 1986-88 field experimentation (in compendium) using rainfall simulation. Also, validation data sets are available from USLE database. Available test data sets: -- Ideal data for testing: Ideal data would consist of breakpoint (recording raingage) rainfall data, observed temperatures, radiation, wind, plant cover, residue cover, storm runoff, storm sediment loss, etc. User groups Currently or plans for collaborating with: Yes. Documentation Key papers of the model: Flanagan, D.C., J.E. Gilley and T.G. Franti. 2007. Water Erosion Prediction Project (WEPP): development history, model capabilities, and future enhancements. Trans. Am. Soc. Agric. Biol. Eng. 50(5):1603-1612. Is there a manual available: yes Model website if any: http://www.ars.usda.gov/Research/docs.htm?docid=10621 Additional comments Comments: -- Issues Help Input Files Output Files Download Source