Scaling Soil Water Properties and Infiltration Modeling
1984
Ahuja, L. R. | Naney, J. W. | Nielsen, D. R.
We examined variability and interrelation of the scaling factors for Green-Ampt infiltration parameters of saturated hydraulic conductivity (Kₛ) and wetting-front pressure head (hf) in a 9.6-ha grassland watershed, containing three hydrologically similar silt loam Mollisols. Scaling factors for different depths at a given site appeared to be related. The scaled mean Kₛ decreased with depth, while the scale mean hf showed no trend. The Kₛ scaling factors had greater variability between sites than the hf factors, and the relationship between the two sets of factors deviated appreciably from a 1:1 line. However, there was a linear relationship between them, which was utilized in modeling infiltration. The composite infiltration for the watershed calculated by using different, but related, scaling factors for Kₛ and hf was very close to that obtained by using the same scaling factors, derived from either Kₛ or hf, for both. However, the distribution and range of the predicted infiltrations were greatly different.
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