Soil Texture Triangle

Sand %

Silt %

Cla

y %

Clay

SiltSand

Silty C

lay

Clayey S

ilt

San

dy C

lay

Cla

yey

San

d

Silty Sand Sandy Silt

Sandy SiltyClay

Clayey SandySilt

Clayey SiltySand

Alfaro & ChatenetOverlay

Aggregate Populations

gmd* (µm) gsd**

FSS 125 1.6

FS 210 1.8

MS 520 1.6

CS 690 1.6

* gmd – geometric mean mass diameters** gsd – geometric standard deviations

Soil Texture&

Alfaro and ChatenetOverlay Triangle

Sand %

Silt %

Cla

y %

Wind Erodibility GroupTriangle

4

71

6

2

3

4L

5

4

71

6

2

3

4L

5

Wind Erodibility Group&

Soil TexturesOverlay Triangle

Sand %

Silt %

Cla

y %

Clay

SiltSand

Silty C

lay

Clayey S

ilt

San

dy C

lay

Cla

yey

San

d

Silty Sand Sandy Silt

Sandy SiltyClay

Clayey SandySilt

Clayey SiltySand

4

71

6

2

3

4L

5

Wind Erodibility Group,Alfaro and Chatenet,

&Soil Textures

Overlay Triangle

JAMES Stable & Unstable - All Soils ERs by Windspeed Categories

0.00E+00

2.00E-03

4.00E-03

6.00E-03

8.00E-03

1.00E-02

1.20E-02

20 - 24.9 25 - 29.9 30 - 34.9 35 - 39.9 40 - 44.9 45 - 49.9 50 - 54.9

Windspeed Categories

Em

issi

on

Rat

es (

ton

s/ac

re/h

ou

r)

1U

1S

Alfaro and Gomes (2001) Model

ALFARO (Texture Class ERs by Windspeed Cats)

-2.50E-02

2.50E-02

7.50E-02

1.25E-01

1.75E-01

2.25E-01

2.75E-01

3.25E-01

3.75E-01

4.25E-01

4.75E-01

20-24.9 25-29.9 30-34.9 35-39.9 40-44.9 45-49.9 50-54.9

Windsped Categories

Em

issi

on

Rat

es (

ton

s/ac

res/

ho

ur)

FSS

FS

MS

CS

All Soils

JAMES Soil Group ERs with Alfaro Adjustment

0.00E+00

5.00E-03

1.00E-02

1.50E-02

2.00E-02

2.50E-02

3.00E-02

3.50E-02

20-24.9 25-29.9 30-34.9 35-39.9 40-44.9 45-49.9 50-54.9

Windspeed Categories

Em

issi

on

Rat

es (

ton

s/ac

res/

ho

ur)

1U - FSS

1S - FSS

1U - FS

1S - FS

1U - MS

1S - MS

1U - CS

1S - CS

JAMES Unstable - Alfaro Adjusted VS. Unadjusted (All Soils)

0.00E+00

5.00E-03

1.00E-02

1.50E-02

2.00E-02

2.50E-02

3.00E-02

20-24.9 25-29.9 30-34.9 35-39.9 40-44.9 45-49.9 50-54.9

Windspeed Categories

Em

issi

on

Rat

es (

ton

s/ac

re/h

ou

r)

1U - FSS

1U - FS

1U - MS

1U - CS

1U

JAMES Stable - Alfaro Adjusted VS. Unadjusted (All Soils)

0.00E+00

5.00E-03

1.00E-02

1.50E-02

2.00E-02

2.50E-02

3.00E-02

3.50E-02

20-24.9 25-29.9 30-34.9 35-39.9 40-44.9 45-49.9 50-54.9

Windspeed Categories

Em

issi

on

Rat

es (

ton

s/ac

re/h

ou

r)

1S - FSS

1S - FS

1S - MS

1S - CS

1S