Campus Units

Agronomy

Document Type

Article

Publication Version

Published Version

Publication Date

10-1985

Journal or Book Title

Water Resources Research

Volume

21

Issue

10

First Page

1539

Last Page

1544

DOI

10.1029/WR021i010p01539

Abstract

To determine the soil water diffusivity, D(θ), by the horizontal infiltration method of R. R. Bruce and A. Klute (1956) the slope of the water distribution curve and the area under the curve must be evaluated. Experimental data often exhibit scatter, thus making the evaluation of the slope difficult. In this paper a rapid, simple method is described that introduces an empirical function that by linear least squares regression yields a curve that fits water distribution data for a wide range of soil textures. The function is differentiable, and its integral is easily calculated with a numerical technique available on programmable scientific calculators. The proposed method produces estimates of D(θ) that reach expected large values near water saturation. This result offers a clear advantage over other simple methods that assume an exponential relation between D and θ and thus describe D(θ) adequately only over the middle range of water contents.

Comments

This article is published as McBride, John F., and Robert Horton. "An empirical function to describe measured water distributions from horizontal infiltration experiments." Water Resources Research 21, no. 10 (1985): 1539-1544. doi; 10.1029/WR021i010p01539. Posted with permission.

Copyright Owner

American Geophysical Union

Language

en

File Format

application/pdf

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