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This article in SSSAJ

  1. Vol. 57 No. 3, p. 674-680
     
    Received: Dec 3, 1991
    Published: May, 1993


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doi:10.2136/sssaj1993.03615995005700030007x

Predicting Soil Detachment by Raindrops

  1. P. P. Sharma ,
  2. S. C. Gupta and
  3. G. R. Foster
  1. Land Reclamation Research Center, North Dakota State Univ., P.O. Box 459, Mandan, ND 58554
    Dep. of Soil Science, Univ. of Minnesota, St. Paul, MN 55108
    USDA-ARS Sedimentation Lab., P.O. Box 1157, Oxford, MS 38655

Abstract

Abstract

The process of soil erosion by water across a landscape is modeled by mathematically linking the subprocesses of detachment, transport, and deposition of sediments. Contemporary soil erosion models represent the raindrop detachment rate as a nonlinear function of rainfall intensity, the parameters of which have to be experimentally derived from interrill erosion plot data. We describe a model that predicts the rate of soil detachment by multiple raindrops impacting on a bare soil surface. The model depends on parameters of a soil-strength-dependent single-drop detachment model and a bivariate raindrop-size distribution function. The simulated data is analyzed to represent raindrop detachment rate as a linear and a nonlinear function of intensity. Equations that relate the parameters of soil detachment rate vs. intensity functions to the parameters of the single-drop detachment model are presented.

Contribution from the Minnesota Agric. Exp. Stn., Dep. of Soil Science, Univ. of Minnesota, Scientific Journal Series, Paper no. 19620.

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