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

de Rooij, Gerrit Huibert

doi:https://doi.org/10.5194/gmd-18-6921-2025

Articles | Volume 18, issue 19

https://doi.org/10.5194/gmd-18-6921-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-18-6921-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 19

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

Data sets

Observed soil water retention and soil hydraulic conductivity data and fits to those data by RIAfitter and KRIAfitter G. de Rooij https://doi.org/10.5281/zenodo.14051087

Model code and software

Fitting the junction model and other models for the unsaturated hydraulic conductivity curve: KRIAfitter G. de Rooij https://doi.org/10.5281/zenodo.14047941

Fitting the parameters of the RIA parameterization of the soil water retention curve (2.0) G. de Rooij https://doi.org/10.5281/zenodo.6491978

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.