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This article in SSSAJ

  1. Vol. 59 No. 2, p. 292-299
     
    Received: Mar 8, 1993


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doi:10.2136/sssaj1995.03615995005900020003x

Correspondence of Hydraulic Functions for Unsaturated Soils

  1. A. W. Warrick
  1. Department of Soil and Water Science, 429 Shantz Bldg., Univ. of Arizona, Tucson 85721

Abstract

Abstract

This study investigated the correspondence of hydraulic functions for unsaturated soils. The overall idea was to identify general properties and explore conditions for which alternative functions give the same or similar responses. Five commonly used empirical forms were examined in this context. The objective was to extend solutions based on particular forms of hydraulic models to more general conditions. For example, the commonly applied formula for steady-state flow of a disk infiltrometer assumes a quasi-linear form of Richards' equation. Another area of application is parameter identification and the choice of alternative models. In order for two sets of models to correspond, the zeroth and first moments of the soil water diffusivity, D, should be equal for the respective models. The zeroth moment is simply the integral of D with respect to water content across the range of interest and is closely related to sorptivity and capillary length. The first moment characterizes the shape of D.

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