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Effect of Soil Shear Strength on Soil Detachment due to Raindrop Impact¹

ABSTRACT

Soil strength was altered in three different ways to test the hypothesis that soil splash from raindrop impact is related to soil strength parameters. Bulk density changes were used to alter direct solid particle-to-particle contact; changes in matric potential were used to change contact relationships between solid particles and liquid films; and additions of polyvinyl alcohol (PVA) provided a direct bonding mechanism between solid particles. The amount of soil detached by a single simulated 4.8-mm raindrop falling from a height of 177 cm was closely correlated with the shearing strength as measured by a triaxial compression test.

¹ Contribution from the North Central Region, Soil, Water and Air Sciences, USDA-ARS, St. Paul, Minn., in cooperation with the Minnesota Agric. Exp. Stn. Sci. Pap. no. 9671.

² Research Assistant, Univ. of Minnesota, St. Paul, Minn.; and Soil Scientist, North Central Region, USDA-ARS and Professor, Univ. of Minnesota, St. Paul, Minn. 55108, respectively.

Received for publication January 17, 1977. Accepted for publication March 25, 1977.

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