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[edit] WEPP
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[edit] Metadata
| Modeler information | |
|---|---|
| First name | Dennis |
| Last name | 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 |
| Email address | flanagan@purdue.edu |
| Phone | 765-494-7748 |
| Fax | 765-494-5948 |
| Additional modeler information | |
|---|---|
| First name | Jim |
| Last name | Frankenberger |
| Type of contact | Technical contact |
| Institute / Organization | |
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| Postal address 2 | |
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| Model identity | |
|---|---|
| Model type | Modular |
| Spatial dimensions | |
| Spatial extent | |
| Model domain | , |
| One-line model description | Process-based soil erosion by water at field/farm scale |
| Extended model 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. |
| Model technical information | |
|---|---|
| Supported platforms | Unix, Linux, Windows |
| Other platform | |
| Programming language | Fortran77, Fortran90 |
| Other program language | |
| Code optimized | Single Processor |
| Start year development | 1985 |
| 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 | -- |
| Typical run time | <1 minute for hillslope simulations |
| Input - Output description | |
|---|---|
| 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 description model | |
|---|---|
| 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 | |
| Model 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. |
| Users groups model | |
|---|---|
| Do you have current or future plans for collaborating with other researchers? | Yes |
| Documentation model | |
|---|---|
| Provide key papers on model if any | 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 |
| Upload manual if available: | |
| Model website if any | http://www.ars.usda.gov/Research/docs.htm?docid=10621 |
| Model forum / discussion board | |
| Additional comments | |
|---|---|
| Comments | -- |
