2. Wind Erosion & Deposition
Earth & Space Science
Hutto HS
CBFrazier

3. Wind Erosion Abrasion Sandblasting effect of wind
Cuts & polish rock near surface

4. Wind Erosion Deflation Lifting and removal of loose material,
Shallow depressions – blowouts
Lower surface – desert pavement
"The Big Hollow"

5. Suspension < 0.1 mm Parallel to surface & by strong winds.
Return to earth when the wind subsides or down w/ precipitation.
Can travel hundreds of miles.

6. Saltation .1 - .5 mm w/in 30 cm of surface
short bounces along the surface and
dislodging additional particles with each impact.
% of the total movement of soil by wind. 

7. Surface Creep
.5 – 1 mm
Rolling & sliding of larger soil particles along the ground surface.
Aided by the bouncing impacts of the saltation
5 - 25% of total soil movement by wind.

8. Wind Erosion While soil can be blown away at virtually any height, the
majority (> 93%) of soil < 1 meter.

9. Wind Deposits
Loess
Blankets of silt (dirt)

10. Wind Deposits
Dunes
Mounds & ridges of sand

12. Types of Dunes
Barchan dunes
Due to wind in 1 direction
No vegetation

13. Types of Dunes
Transverse dunes
 perpendicular to the prevailing wind

14. Types of Dunes
Longitudinal dunes
 parallel to prevailing wind

15. Types of Dunes
Parabolic dunes
 formed from “blowout” of vegetation

16. Wind Erosion
3 types of movement
Suspension
Saltation
Surface Creep
4 types of dunes
Barchan
Transverse
Linear
Parabolic
You should be able to discuss, define & or identify these types of movements & dunes