Articles | Volume 18, issue 19
https://doi.org/10.5194/gmd-18-6921-2025
https://doi.org/10.5194/gmd-18-6921-2025
Model description paper
 | 
08 Oct 2025
Model description paper |  | 08 Oct 2025

Fitting the junction model and other parameterizations for the unsaturated soil hydraulic conductivity curve: KRIAfitter version 1.0

Gerrit Huibert de Rooij

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Cited articles

Abramowitz, M. and Stegun, I. A.: Handbook of mathematical functions. With formulas, graphs, and mathematical tables, National Bureau of Standards, Dover edition, New York, USA, ISBN-10 0486612724, ISBN-13 9780486612720, 1964. 
Assouline, S.: A model for soil relative hydraulic conductivity based on the water retention characteristic curve, Water Resour. Res., 37, 265–271, https://doi.org/10.1029/2000WR900254, 2001. 
Bittelli, M. and Flury, M.: Errors in water retention curves determined with pressure plates, Soil Sci. Soc. Am. J., 73, 1453–1460, https://doi.org/10.2136/sssaj2008.0082, 2009. 
Brooks, R. H. and Corey, A. T.: Hydraulic properties of porous media, Colorado State Univ., Hydrology Paper No. 3, 27 pp., 1964. 
Brutsaert, W.: Hydrology. An introduction, Cambridge University Press, Cambridge, UK, ISBN-10 0521824796, ISBN-13 978-0521824798, 2005. 
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Short summary
Water flows ever more slowly in soil when the soil dries out. This can be described by the conductivity curve that accounts for water filling up small spaces, sticking to grains in films, and water vapour diffusion. This paper introduces a relatively simple model for this curve that needs one fewer parameter than most others. It works well for most soils, but some need the extra parameter. The paper also presents a computer program to determine the parameter values of this and other models.
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