Wind Erosion

 

 

 

 

X= f(F, G, R,W, V)

X= potential average annual erosion

F= soil erodibility

G= local wind erosion climatic factor

R= soil surface roughness

W= equivalent width of field

V= equivalent quantity of vegetative cover.

 

Wind erosion conservation

1.windbreaks  description, exampleDrip design for windbreaks
2. stripcropping
3.spreading trash
4. snow deposition
5. sunflower barriers
6. emergency tillage
7.  grass barriers .

d= 17h (vm/v)cos (theta)_

where d= distance of full protection

h= height of barrier in any units 

vm= minimum wind velocity at 50 ft height required to move the most erodible soil fraction

v= actual wind velocity at 50 ft height

theta= angel of deviation of prevailing wind direction from the perpendicular to the wind break.

vm can be estimated at 21.5 mph

correction for wind height 

d= 17 *h*1 if wind speed is 21.5 and theta is 0  cos 0 is 1 

height of trees 30 ft then protection is 510 ft. 

if wind is 40 then d= 17*30*21.4/40 = 272

 

u2/u1= (z2/z1)^.2

example wind speed for Campbell network is at 12 ft 

u2=u1*(z2/z1)^.2=  15mph * (50/12)^.2 = 15*1.33= 20 mph

 

 

 application of irrigation of .39 to 59 inches per day to keep soil from blowing. 

 

 

Type of plant suited for New Mexico for wind and water conservation