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A Simple Approximate Equation to Calculate Diffusivities from One-Step Outflow Experiments

School of Agriculture of Athens, Lab. of Agric. Hydraulics, 75, Iero Odos, Votanikos, 11 855 Athens, Greece

ABSTRACT

Gardner's approximation for determining soil water diffusivities, D(), from one-step outflow experiments may deviate significantly from actual D() values. By the systematic analysis of a weighting function which corrects the Gardner's solution, a new simple and accurate equation is derived. Numerical outflow experiments were performed for a variety of arbitrary D() functions to demonstrate the validity of the equation. Results indicate that the suggested procedure is applicable even for nonlinear ln D() functions and is more accurate than other previous methods. The present equation has been applied to analyze one-step outflow experiments in two soils. Numerical predictions of the outflow volumes are in good agreement with laboratory measurements.

Contribution from the Lab. of Agric. Hydraulics, Agricultural Univ. of Athens, Athens 11 855, Greece.

Received for publication May 12, 1988.

This article has been cited by other articles:

				J. D. Valiantzas, P. Londra, and A. Sassalou Explicit Formulae for Soil Water Diffusivity Using the One-Step Outflow Technique Soil Sci. Soc. Am. J., September 28, 2007; 71(6): 1685 - 1693. [Abstract] [Full Text] [PDF]