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This article in SSSAJ

  1. Vol. 40 No. 5, p. 635-639
     
    Received: Dec 22, 1975


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doi:10.2136/sssaj1976.03615995004000050013x

Radial Movement of Saturated Zone Under Constant Flux: Theory and Application to the Determination of Soil-water Diffusivity1

  1. B. L. Sawhney and
  2. J. -Y. Parlange2

Abstract

Abstract

A two-dimensional similarity solution yields the soil-water diffusivity of an unsaturated soil when the soil water content is measured as a function of the distance from the source. When ponding occurs, the positions of the saturated and unsaturated fronts are related to the diffusivity. If the diffusivity can be described with two parameters, it can be predicted from the position of the two fronts alone without measuring the moisture profile.

Four experiments with a fine sandy loam at two different flow rates were performed to determine the diffusivity from the position of the two fronts. The moisture profile was then predicted from the measured diffusivity. The predictions are in good agreement with the observations.

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