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Effects of Ridges on Erosion of Soil by Wind¹

ABSTRACT

The effect of ridges on soil erosion by wind was studied under laboratory conditions with wind tunnels. Smoothed soil surface and 1.3, 2.5, 5.1, 10.2, and 20.3 cm. high ridges constructed of dune sand and three simulated cultivated soils were exposed to six wind velocities ranging from 47 to 83 miles per hour. Ridges 5.1 to 10.2 cm. high eroded little due to trapping of soil particles between ridges and average wind velocity decrease. Ridges less than 5.1 cm. high were not as effective in trapping soil particles and reducing wind velocities. Extensive erosion on ridges higher than 10.2 cm. resulted from higher wind velocities at the ridge crests and increased wind eddying.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Kansas Agr. Exp. Sta. Dept. of Agronomy, Contribution No. 838. Presented before Div. S-6, Soil Sci. Soc. Am., Denver, Colorado, Nov. 18, 1963.

² Soil Scientists, USDA, Manhattan, Kans. Senior author is now located at U. S. Big Spring Field Station, Big Springs, Tex. W. H. Chepil deceased, Sept. 6, 1963. F. H. Siddoway is now Director, Northern Plains Soil & Water Field Sta., Sidney, Mont.

Received for publication August 12, 1963. Accepted for publication February 27, 1964.