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This article in SSSAJ

  1. Vol. 47 No. 5, p. 1047-1049
    Received: Sept 21, 1982



A Simplified Model for Solute Movement Through Soils1

  1. A. Amoozegar-Fard,
  2. A. W. Warrick and
  3. W. H. Fuller2



Solute movement through soil can be described by a variety of mathematical models whose unknown parameters (often three or more) must be estimated accurately and efficiently. In many cases, the movement of an ion can be described by a breakthrough curve at a given depth. Such a curve resulting from a step input of solute is often of sigmoidal shape. In this paper, an error function model that fits such a breakthrough curve is presented with two unknown parameters. The parameters can be estimated explicitly by a small calculator. Although chosen by least square differences, the parameters can be interpreted on the basis of sound physical principles.

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