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Estimation of the Spatial Variability of the Soil-Water Flux¹

ABSTRACT

A simple method for estimating the spatial variability of the soil-water flux from known variability of soil microhydrologic properties is presented. The method is based on the theory of approximating a differentiable function using Taylor-series expansion (TS-method). Published data for means and variances of the soil microhydrologic properties were used to estimate the mean and variance of the soil-water flux in a draining profile of Panoche soil. These values were compared with those estimated using a Monte Carlo simulation procedure (MC-method) on the same set of data. Relative advantages and disadvantages of these two methods are briefly discussed.

¹ Joint contribution from the Dep. of Soil Sci. and Statistics, Univ. of Florida. This research was funded in part by the EPA Grant no. R-803067 and in part by special funds from the Center for Environ. Programs of the Instit. of Food and Agric. Sci. Florida Agric. Exp. Stn. Journal Ser. no. 493.

² Assistant Research Scientist, Dep. of Soil Sci.; Professor, Dep. of Statistics; and Professor, Dep. of Soil Sci., respectively; Univ. of Florida, Gainesville, FL 32611.

Received for publication April 11, 1977. Accepted for publication July 19, 1977.