· do not lead to the elimination of vegetation cover over large areas;
· reduce the length of fetch to decrease the momentum of wind;
· increase soil cohesiveness or armour the soil surface to prevent the lifting of soil particles by wind;
· reduce the velocity of wind near the ground and deflect its direction;
· control the source of dune-building material.
As regards ways for preventing wind erosion, the most effective ones include:
· locating livestock watering facilities on non-erodible soil;
· protecting agricultural fields and heavy-use areas with shelter-belts;
· maintaining a good balance between herbaceous and woody plants;
· spacing of shrubs and trees on grazing lands to reduce wind velocity.Wind is air in movement, caused by a gradient in the air density generated by differences in atmospheric pressures and/or temperatures.
The erosive power of wind, as in the case of water, increases exponentially with velocity but, unlike water, wind is not affected by the force of gravity. However, the length of unobstructed terrain (fetch) over which the wind flows is important in allowing the wind to gain momentum and to increase its erosive power. Air movement must attain a certain velocity or become an "efficient wind" (with enough speed to generate visible movement of particles at the soil level) before it can generate deflation and transport of particles. Winds with velocities of less then 12-19 km/hr at I m above the ground seldom impart sufficient energy at the soil surface to dislodge and put into motion sand-sized particles. Drifting of highly erosive soil usually starts when the wind attains a forward velocity of 25-30 km/hr at a height of 30 cm above the soil surface (Hopkins et al., 1937).
I hope I helped :)
