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Prediction of steady-state ponded infiltration distributions in a soil with vertical macropores

Smettem, K.R.J. and Collis-George, N. (1985) Prediction of steady-state ponded infiltration distributions in a soil with vertical macropores. Journal of Hydrology, 79 (1-2). pp. 115-122.

Link to Published Version: https://doi.org/10.1016/0022-1694(85)90186-6
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Abstract

A Monte Carlo simulation is used to predict the distributions of steady-state infiltration rate values for different infiltrometer ring sizes in a soil with vertical macropores. The simulation requires functional characterization of flow in soil macropores, coupled with a knowledge of macropore spatial dispersion. An additional option includes soil matrix hydraulic conductivity K(sat) which is assumed to be normally distributed with a known mean and standard deviation. The model was checked against measured data for two different ring sizes (0.071 and 0.0022 m2) and good agreement was obtained. It is shown that in a soil with vertical transmission macropores, the distribution of steady-state infiltration rate values becomes increasingly skewed as ring size is decreased, unless K(sat) is of sufficient magnitude to mask the macropore contribution. A method for determining the probability of a sensor with a known horizontal cross-sectional soil contact area intercepting at least one macropore is also presented.

Publication Type: Journal Article
Publisher: Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/37776
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