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Abstract

 

This article in SSSAJ

  1. Vol. 33 No. 5, p. 645-651
     
    Received: Feb 13, 1969


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doi:10.2136/sssaj1969.03615995003300050011x

Soil-Water Hysteresis Measured in a Sandy Loam and Compared with the Hysteretic Domain Model1

  1. G. C. Topp2

Abstract

Abstract

A uniformly packed column of sandy loam soil was subjected to a controlled series of wetting and drying changes. Soil water contents were obtained from gamma ray attenuation information while simultaneous tensiometer pressures at five locations along the column were measured by a pressure transducer. In addition, the flows of the water solution to and from the column were read in burettes. The data from the tensiometers demonstrated a high degree of uniformity throughout the soil. Analysis of the primary scanning curves of the water content versus pressure head showed that the independent domain theory of hysteresis is an inadequate model for both wetting and drying curves. A refinement to the theory could not be tested with these data. Following consolidation during the initial drying phase there was no measurable hysteresis in the water content-hydraulic conductivity relationship.

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