Soil Erosion Network: Model Metadata
RWEQ

 
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1999

 

1. MODEL IDENTIFICATION
1.1 Model name: RWEQ
1.2 Most recently released version: RWEQ97
1.3 Date of release: June 1998
2. WATER EROSION/WIND EROSION/BOTH? Wind erosion only
3. CONTACT PERSON
3.1 Name: Dr. Ted M. Zobeck
3.2 Address: USDA-ARS
3810 4th St
Lubbock, TX 79415
3.3 Telephone: 806-723-5240
3.4 Fax: 806-723-5270
3.5 E-mail: tzobeck@lbk.ars.usda.gov
4. MODEL AUTHOR(S): D. W. Fryrear
A. Saleh
J. D. Bilbro
H. M. Schomberg
J. E. Stout
T. M. Zobeck
5. MODEL COMPONENTS
5.1 Water erosion: Not Modelled
5.2 Wind erosion: Modification of Wind Erosion Equation
5.3 Hydrology: estimates soil wetness
5.4 Site/topography: Uniform field area
5.5 Plant cover: Generic crop growth model
5.6 Soil: Only surface horizon considered
5.7 Chemistry: Calcium carbonate, organic matter
5.8 Weather: Requires daily weather data
6. MODEL CHARACTERISTICS
6.1 Spatial characteristics

6.1.1 Class of area modelled (field/catchment/landscape/other):

Field

6.1.2 If catchment or larger, flow routing system (cell/grid/streamline/other):

N/A

6.1.3 Minimum area for which model is applicable:

Function of field length scale, s, used in transport equation.

6.1.4 Maximum area for which model is applicable:

Unspecified
6.2 Temporal characteristics

6.2.1 Timestep:

daily

6.2.2 Single or multiple event model?

Can be both

6.2.3 Maximum recommended simulation duration:

Unspecified
7. MODEL'S REPRESENTATION OF PROCESSES
7.1 Water erosion processes

7.1.1 Interrill:

Not Modelled

7.1.2 Rill:

Not Modelled

7.1.3 Gully:

Not Modelled

7.1.4 Streambank:

Not Modelled

7.1.5 Deposition:

Not Modelled
7.2 Wind erosion processes: saltation transport based on estimated maximum transport
7.3 Hydrological processes

7.3.1 Evaporation/transpiration:

Used to model soil wetness based on Samani and Pessarakli, 1986

7.3.2 Runoff:

Not Modelled

7.3.3 Infiltration:

Not Modelled

7.3.4 Subsurface flow:

Not Modelled

7.3.5 Return flow:

Not Modelled
7.4 Plant processes

7.4.1 Light interception and photosynthesis:

Not Modelled

7.4.2 Dry matter and residue:

same equation used in RUSLE (Revised USLE)

7.4.3 Root growth:

Not Modelled

7.4.4 Pests:

Not Modelled

7.4.5 CO2 sensitivity:

Not Modelled
7.5 Soil:

7.5.1 Crust development: factor based on clay and organic matter content
7.6 Chemistry

7.6.1 Nutrients:

Not Modelled

7.6.2 Carbon:

Not Modelled

7.6.3 Pesticides:

Not Modelled

7.6.4 Pesticide movement

Not Modelled

7.6.5 Other contaminants:

Not Modelled
7.7 Weather: requires daily wind speed, wind direction, rainfall, solar radiation, air temperature
7.8 Other:
8. INPUT DATA. Please distinguish between mandatory (*) and optional items
8.1 Weather: Files available for several hundred locations in USA. requires daily wind speed*, wind direction*, rainfall*, solar radiation*, air temperature*
8.2 Soil: Sand*, silt, clay*, organic matter, calcium carbonate, rock fragments
8.3 Hydrology: None
8.4 Plant cover: flat residue percent*, stem number*, crop height*
8.5 Management: Dates of tillage operation*, tool used*, ridge height* and spacing*, irrigation amount*
8.6 Topography/site characteristics: Field length*, width* or diameter*, slope length and gradient for hills
8.7 Other:
9 OUTPUT DATA: Mean soil loss per unit area for measurement period
10 PROGRAMMING LANGUAGE: C
11 COMPUTER REQUIREMENTS: 386 and higher with math coprocessor, 4Mb RAM and higher
Hard disk with 3 Mb free disk space, DOS 5.0 or higher, High density 3.5" diskette drive
12 DOCUMENTATION
12.1 Scientific documentation: Fryrear, D.W., Saleh, A., and Bilbro, J.D., 1998. A single event wind erosion model. Transactions of the American Society of Agricultural Engineers 41(5):1369- 1374.
12.2 User's guide: Fryrear, D. W., Ali Saleh, J. D. Bilbro, H. M. Schomberg, J. E. Stout, and T. M. Zobeck. 1998. Revised Wind Erosion Equation (RWEQ). Wind Erosion and Water Conservation Research Unit, USDA-ARS, Southern Plains Area Cropping Systems Research Laboratory. Technical Bulletin No. 1 Internet address http://www.csrl.ars.usda.gov/wewc/rweq/readme.htm
12.3 Technical documentation: Same as user’s guide above
13 AVAILABILITY: http://www.csrl.ars.usda.gov/wewc/rweq/rweq.htm
14 OTHER RELEVANT INFORMATION: Includes option to model effect of wind barriers

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