Wind performs three processes which are

1. Erosion
2. Transportation
3. Deposition

1. Wind erosion

Is the breaking, wearing and removal of rocks and soil from one place to another by wind.

 

Note:Erosion is the wearing and breaking down of rocks (attrition) and the transportation/removal of broken down pieces from one place to another by;i.            Waterii.           Glaciers (moving ice)

iii.           Wind

iv.          Waves

v.           Gravity (all these are called agents)

Weathering is the breaking down of rocks into smaller pieces in situ.

In situmeans in original position. (That is, there is no transportation involved in weathering, ua utloa?

 

 

Three processes of wind erosion

1. Abrasion
2. Deflation
3. Attrition

1. Abrasion (a-bray-tjin): wearing away of rocks and removal of soil by particles or load carried by wind.

2. Deflation (di-flay-tjin): removal of loose material from the earth’s surface.

3. Attrition (a-tri-tjin): is when wind cause rocks and boulders on the surface to bump into each other and to break up into smaller pieces

 

Features formed from wind Erosion (Abrasion, Deflation & Attrition)

 

a) Rock pedestal/Mushroom Rock

rock1 Copied from http://en.wikipedia.org/wiki/Aeolian_processes

 

b) Inselbergs is German. It means an Island mountain

rock2copied http://tec.army.mil/research/products/desert_guide/lsmsheet/lsbould.htm

c) Yardang

d) Zeugens

e) Depression

f) Reg

g) Hamada

 

2     Wind Transportation

 

This is the carrying of load by wind.

Three processes of Wind Transportation

(a) Suspension

(b) Saltation/Jumping/bouncing

(c) Traction/Rolling/Surface Creep

 

(a) Suspension: Silt, sand particles and clay sized particles are carried within the wind

(b) Saltation: bigger sand particle and small stones bounce along the ground surface in a ‘leap-frog’ movement.

(c) Traction: large stones or boulders roll or are pushed over the ground surface. This needs most energy. This is related to Abrasion in erosion that is discussed above. Simple eh?

 

rock3

http://en.wikibooks.org/wiki/High_School_Earth_Science/Wind_Erosion_and_Deposition

 

3.  Wind Deposition

This is as simple as dropping of the load carried by wind.

No processes involved but there are conditions that lead to deposition.

  • These are:
  • When wind loses strength to carry/transport
  • When wind comes across forest
  • It begins with the heaviest material first.

 

Features/Landforms formed

(a) Sand ripples: wavy arrangement of sand

rock4Copied from www.parkerlab.bio.uci.edu

(b) Sand Dunes: accumulation of sand around a barrier (Bush/ stone/rock)

• Barchans

rock5

• Sief Dunes
(c) Loess Deposits

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