unsatfit

unsatfit is a Python library for optimizing parameters of functions of soil hydraulic properties (water retention function and hydraulic conductivity function) where equations are explained in the following paper.

Seki, K., Toride, N., & Th. van Genuchten, M. (2022) Closed-form hydraulic conductivity equations for multimodal unsaturated soil hydraulic properties. Vadose Zone J. 21; e20168.

The proposed equations are useful for practical applications as shown in the following paper.

Seki, K., Toride, N., & Th. van Genuchten, M. (2023) Evaluation of a general model for multimodal unsaturated soil hydraulic properties. J. Hydrol. Hydromech. 71(1): 22-34.

User manual

A user manual is available.

See install and sample code for a quick start.

If you encounter any issues, feel free to ask questions.

Example output

This is an example output of this program; water retention curve (top) and hydraulic conductivity curve (bottom) of Gilat loam fitted with KBC (KO₁BC₂-CH) model.

KBC

For more examples, see Fig. 6 and Appendix in Seki et al. (2023).

History

2006-07-28: SWRC Fit 1.0 (土壌の物理性 version) was created.
2007-02-27: SWRC Fit 1.1 (HESSD version) was released.
2016-09-15: Presented SWRC Fit at Japanese society meeting 地盤工学研究発表会.
2018-09-27: SWRC Fit 3.1 (last Octave version) was released. History of the Octave version.
2021-08-13: SWRC Fit was recommended at 土壌の物理性.
2021-11-24: Paper written with unsatfit was published at VZJ.
2022-01-04: unsatfit 4.0 was released with new version of SWRC Fit.
2022-10-29: Presented at Japanese society meeting 土壌物理学会.
2023-02-04: Paper introducing unsatfit was published at JHH.
2023-08-30: Improvement of dual-VG fitting was presented at Japanese society meeting 農業農村工学会.
2023-10-07: unsatfit 5.1 was released (update).
2023-12-21: Improvement of dual-VG fitting was published at 土壌の物理性 in Japanese.
2024-03-13: User manual of SWRC Fit and unsatfit was published at JTUNS.
2024-05-14: hystfit for calculating hysteresis of SWRC was released.

Update of this document