Soil Texture Triangle
Alfaro & Chatenet
Overlay
Aggregate
Populations
Clay
gmd*
(µm)
gsd**
FSS
125
1.6
FS
210
1.8
MS
520
1.6
CS
690
1.6
Sa
ay
nd
Cla
t%
Sandy Silty
Clay
Clayey Silty
Sand
Clayey Sandy
Silt
Silty Sand
Sandy Silt
Sand %
t
Sil
Cl
ay
ey
Sa
ey
ay
Cl
Sand
Sil
y%
Cl
nd
ty
yC
Sil
l ay
* gmd – geometric mean mass diameters
** gsd – geometric standard deviations
Silt
Soil Texture
&
Alfaro and Chatenet
Overlay Triangle
y%
Wind Erodibility Group
Triangle
Sil
4
Cla
t%
2
4L
1
3
6
5
Sand %
7
Wind Erodibility Group
&
Soil Textures
Overlay Triangle
4
2
4L
1
3
6
5
7
Wind Erodibility Group,
Alfaro and Chatenet,
&
Soil Textures
Overlay Triangle
Sa
y%
nd
Cla
t%
2
Clayey Silty
Clayey Sandy
4L
Sand
Silt
3
Silty Sand
t
Sil
Cl
ay
ey
Sa
ey
ay
Cl
1
Sand
Sil
ay
4
Sandy Silty
Clay
Cl
nd
ty
yC
Sil
l ay
Clay
6
5
Sandy Silt
Sand %
7
Silt
JAMES Stable & Unstable - All Soils ERs by Windspeed Categories
1.20E-02
Emission Rates (tons/acre/hour)
1.00E-02
8.00E-03
1U
6.00E-03
1S
4.00E-03
2.00E-03
0.00E+00
20 - 24.9
25 - 29.9
30 - 34.9
35 - 39.9
Windspeed Categories
40 - 44.9
45 - 49.9
50 - 54.9
Alfaro and Gomes (2001) Model
ALFARO (Texture Class ERs by Windspeed Cats)
4.75E-01
4.25E-01
Emission Rates (tons/acres/hour)
3.75E-01
3.25E-01
FSS
2.75E-01
FS
MS
2.25E-01
CS
All Soils
1.75E-01
1.25E-01
7.50E-02
2.50E-02
-2.50E-02
20-24.9
25-29.9
30-34.9
35-39.9
Windsped Categories
40-44.9
45-49.9
50-54.9
JAMES Soil Group ERs with Alfaro Adjustment
3.50E-02
Emission Rates (tons/acres/hour)
3.00E-02
2.50E-02
1U - FSS
1S - FSS
2.00E-02
1U - FS
1S - FS
1U - MS
1S - MS
1.50E-02
1U - CS
1S - CS
1.00E-02
5.00E-03
0.00E+00
20-24.9
25-29.9
30-34.9
35-39.9
Windspeed Categories
40-44.9
45-49.9
50-54.9
JAMES Unstable - Alfaro Adjusted VS. Unadjusted (All Soils)
3.00E-02
Emission Rates (tons/acre/hour)
2.50E-02
2.00E-02
1U - FSS
1U - FS
1.50E-02
1U - MS
1U - CS
1U
1.00E-02
5.00E-03
0.00E+00
20-24.9
25-29.9
30-34.9
35-39.9
Windspeed Categories
40-44.9
45-49.9
50-54.9
JAMES Stable - Alfaro Adjusted VS. Unadjusted (All Soils)
3.50E-02
Emission Rates (tons/acre/hour)
3.00E-02
2.50E-02
1S - FSS
2.00E-02
1S - FS
1S - MS
1S - CS
1.50E-02
1S
1.00E-02
5.00E-03
0.00E+00
20-24.9
25-29.9
30-34.9
35-39.9
Windspeed Categories
40-44.9
45-49.9
50-54.9