Model:WEPP: Difference between revisions
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|State=Indiana | |State=Indiana | ||
|Country=USA | |Country=USA | ||
|Email address=flanagan@purdue.edu | |Email address=flanagan@purdue.edu | ||
|Phone=765-494-7748 | |Phone=765-494-7748 | ||
|Fax=765-494-5948 | |Fax=765-494-5948 | ||
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|Categories=Hydrology, Terrestrial | |Categories=Hydrology, Terrestrial | ||
|One-line model description=Process-based soil erosion by water at field/farm scale | |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. | |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. | ||
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{{Model technical information | {{Model technical information | ||
|Supported platforms=Unix, Linux, Windows | |Supported platforms=Unix, Linux, Windows | ||
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|Does model development still take place?=Yes | |Does model development still take place?=Yes | ||
|Model availability=As code, As teaching tool | |Model availability=As code, As teaching tool | ||
|Program license type=Other | |Program license type=Other | ||
|Program license type other=-- | |Program license type other=-- | ||
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|Pre-processing software needed?=No | |Pre-processing software needed?=No | ||
|Post-processing software needed?=No | |Post-processing software needed?=No | ||
|Visualization software needed?=No | |Visualization software needed?=No | ||
}} | }} | ||
{{Process description model | {{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 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 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 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 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+). | ||
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|CCA component=No but possible | |CCA component=No but possible | ||
|IRF interface=No but possible | |IRF interface=No but possible | ||
|CMT component=Not yet | |||
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Revision as of 17:39, 23 June 2011
