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Methods for measuring soil velocities caused by a sweep
Soil and Tillage Research
  • H. Mark Hanna, Iowa State University
  • Stephen J. Marley, Iowa State University
  • Donald C. Erbach, United States Department of Agriculture
  • Stewart W. Melvin, Iowa State University
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A field experiment was conducted to measure surface soil velocity and to determine the relation between soil aggregate velocities at the tool surface and at the soil surface. A technique incorporating use of both a video camcorder and wood blocks was developed to measure surface soil velocity. Soil velocity direction at the tool surface was measured from scratch marks on the tool. Velocity measurements were made for three sweeps with different rake angles operated at three speeds and two depths. Surface soil moved in either of two modes: V-flow (upward and laterally in the shape of one leg of the letter V) or snowplow (initially moving upward and subsequently being buried in a wave of soil). Surface soil velocities were uncorrelated with velocities on the tool surface, indicating that soil flow paths over the sweep were not parallel. The ratio of vertical to lateral soil flow at the tool surface increased with larger rake angle and was greater than the ratio at the soil surface. At the soil surface, vertical velocity was greater near the nose than near the wing tip and velocity parallel to the travel direction increased with increased speed and rake angle.

This article is from Soil and Tillage Research 28 (1994): 315–328, doi:10.1016/0167-1987(94)90138-4.

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
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H. Mark Hanna, Stephen J. Marley, Donald C. Erbach and Stewart W. Melvin. "Methods for measuring soil velocities caused by a sweep" Soil and Tillage Research Vol. 28 Iss. 3-4 (1994) p. 315 - 328
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