1.
MODEL IDENTIFICATION |
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1.1
Model name: |
RWEQ |
1.2
Most recently released version: |
RWEQ97 |
1.3
Date of release: |
June
1998 |
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2.
WATER EROSION/WIND EROSION/BOTH? |
Wind
erosion only |
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3.
CONTACT PERSON |
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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 |
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4.
MODEL AUTHOR(S): |
D.
W. Fryrear
A. Saleh
J. D. Bilbro
H. M. Schomberg
J. E. Stout
T. M. Zobeck |
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5.
MODEL COMPONENTS |
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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 |
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6.
MODEL CHARACTERISTICS |
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6.1
Spatial characteristics |
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6.1.1
Class of area modelled (field/catchment/landscape/other):
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Field |
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6.1.2
If catchment or larger, flow routing system (cell/grid/streamline/other):
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N/A |
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6.1.3
Minimum area for which model is applicable:
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Function
of field length scale, s, used in transport equation. |
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6.1.4
Maximum area for which model is applicable:
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Unspecified |
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6.2
Temporal characteristics |
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6.2.1
Timestep:
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daily
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6.2.2
Single or multiple event model?
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Can
be both |
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6.2.3
Maximum recommended simulation duration:
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Unspecified |
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7.
MODEL'S REPRESENTATION OF PROCESSES |
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7.1
Water erosion processes |
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7.1.1
Interrill:
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Not
Modelled |
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7.1.2
Rill:
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Not
Modelled |
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7.1.3
Gully:
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Not
Modelled |
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7.1.4
Streambank:
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Not
Modelled |
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7.1.5
Deposition:
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Not
Modelled |
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7.2
Wind erosion processes: |
saltation
transport based on estimated maximum transport |
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7.3
Hydrological processes |
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7.3.1
Evaporation/transpiration:
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Used
to model soil wetness based on Samani and Pessarakli, 1986 |
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7.3.2
Runoff:
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Not
Modelled |
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7.3.3
Infiltration:
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Not
Modelled |
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7.3.4
Subsurface flow:
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Not
Modelled |
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7.3.5
Return flow:
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Not
Modelled |
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7.4
Plant processes |
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7.4.1
Light interception and photosynthesis:
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Not
Modelled |
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7.4.2
Dry matter and residue:
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same
equation used in RUSLE (Revised USLE) |
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7.4.3
Root growth:
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Not
Modelled |
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7.4.4
Pests:
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Not
Modelled |
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7.4.5
CO2 sensitivity:
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Not
Modelled |
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7.5
Soil: |
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7.5.1
Crust development: |
factor
based on clay and organic matter content |
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7.6
Chemistry |
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7.6.1
Nutrients:
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Not
Modelled |
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7.6.2
Carbon:
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Not
Modelled |
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7.6.3
Pesticides:
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Not
Modelled |
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7.6.4
Pesticide movement
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Not
Modelled |
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7.6.5
Other contaminants:
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Not
Modelled |
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7.7
Weather: |
requires
daily wind speed, wind direction, rainfall, solar radiation,
air temperature |
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7.8
Other: |
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8.
INPUT DATA. Please distinguish between mandatory (*) and optional
items |
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8.1
Weather: |
Files
available for several hundred locations in USA. requires daily
wind speed*, wind direction*, rainfall*, solar radiation*, air
temperature* |
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8.2
Soil: |
Sand*,
silt, clay*, organic matter, calcium carbonate, rock fragments |
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8.3
Hydrology: |
None |
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8.4
Plant cover: |
flat
residue percent*, stem number*, crop height* |
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8.5
Management: |
Dates
of tillage operation*, tool used*, ridge height* and spacing*,
irrigation amount* |
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8.6
Topography/site characteristics: |
Field
length*, width* or diameter*, slope length and gradient for
hills |
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8.7
Other: |
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9
OUTPUT DATA: |
Mean
soil loss per unit area for measurement period |
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10
PROGRAMMING LANGUAGE: |
C |
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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 |
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12
DOCUMENTATION |
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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. |
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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 |
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12.3
Technical documentation: |
Same
as users guide above |
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13
AVAILABILITY: |
http://www.csrl.ars.usda.gov/wewc/rweq/rweq.htm |
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14
OTHER RELEVANT INFORMATION: |
Includes
option to model effect of wind barriers |