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Assessing Wind Erosion Forces: Directions



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Purchased by A g r i c u l t u r a l Research Service U S Department of Agriculture for official use Reprinted from SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS Vol 29 No 5 September October 1965 pages 587 590 677 South Segoe Road Madison Wisconsin 53711 USA Assessing Wind Erosion Forces Directions and Relative Magnitudes1 ABSTRACT Wind erosion force vectors were computed from data of Occurrence of directions by windspeed groups based on wind erosion being proportional to windspeed cubed times the duration of the wind The vectors were obtained by evaluating 2 ut8 ft for each of the 16 principal directions where E8is the cubed mean windspeed within the ith speed group and ft is percentage of total observations that occur in the speed group and direction under consideration The wind e r o s i o n force v e c t o r s were used to compute monthly magnitudes of the total wind erosion forces and direction where the ratio of the wind erosion forces parallel and perpendicular to that direction is a maximum The computed direction indicates proper orientation of a wind barrier for Contribution from the Soil and Water Conservation Research Division ARS USDA and the Kansas Agr Exp Sta Department of Agronomy Contribution no 901 Presented before Div S 6 Soil Science Society America Kansas City Mo Nov 1964 Received Jan 21 1965 Approved Apr 19 1965 aResearch Soil Scientist USDA Manhattan Kans maximum barrier protection The magnitude of the ratio gives the preponderance of wind erosion forces in the direction of maximum wind erosion forces The magnitude of the total wind erosion forces indicates the potential need for protection against the erosion forces to reduce the hazard of Iity soilof theerosion by wind one needs to know i the capacwind to cause erosion on unprotected soils ii N PLANNING WAYS AND MEANS prevailing wind erosion direction or direction of maximum wind erosion forces iii preponderance of wind erosion forces in the direction of maximum wind erosion forces or



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