Brunswick Model of Soil Hydraulic Properties
An example of composite retention (left) and hydraulic conductivity (right) functions in the Brunswick model (from Webber et al., 2020).
In earlier versions of HYDRUS (up to 5.03), soil hydraulic properties (SHP) could be described using multiple analytical models for the water retention and hydraulic conductivity functions, including those by van Genuchten [1980], Brooks and Corey [1964], Durner [1994] and Kosugi [1995], as well as the modified van Genuchten functions [Vogel and Císlerová, 1988]. Alternatively, soil hydraulic properties could be defined using look-up tables, thereby expanding HYDRUS's ability to consider other analytical models or more general shapes.
Much research has been carried out recently to derive analytical models that improve the description of soil hydraulic properties in the very dry range (e.g., Peters et al., 2013, 2021; Weber et al., 2019, 2020; Iden et al., 2021; Seki et al., 2023). While these models can be accommodated in HYDRUS using the input of look-up tables, we nevertheless included one such formulation directly in HYDRUS. In collaboration with Stathis Diamantopoulos and Tobias Weber [Diamantopoulos et al., 2024], we implemented into Version 5.04 of H1D their generalized modular framework [Weber et al., 2019], which partitions the soil hydraulic property functions into capillary and noncapillary (e.g., water in corners and/or films) parts. The water retention curve is, for this purpose, considered to be a weighted sum of a parametric capillary retention function (one of the analytical functions referred to above) and a new general model for the noncapillary saturation function [Weber et al., 2019].
The hydraulic conductivity function is then obtained similarly. The capillary part of K(h) is obtained by adopting Mualem's integral, while the noncapillary part of K(h) is estimated directly from the new noncapillary saturation function [Weber et al., 2019].
Since the generalized modular framework of Weber et al. [2019] can be combined with all soil hydraulic functions currently available in HYDRUS (i.e., van Genuchten, 1980; Brooks and Corey, 1964; Kosugi, 1995; Vogel and Císlerová, 1988), it provides significant additional flexibility to how soil hydraulic properties can be described in HYDRUS. The resulting module currently has a working title, the Brunswick model. The implementation details and example applications are given in Diamantopoulos et al., [2024].
- Project Group: Brunswick Model
- Description: Examples demonstrating the use of the standard SHP models and the Brunswick SHP Model
- Availability: Download HYDRUS projects now (5.0 MB)
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Project
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Description
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E-ClayVGM
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Evaporation process - Clay soil, the VGM model.
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E-ClayVGMBW
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Evaporation process - Clay soil, the VGM model combined with the Brunswick model.
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E-LoamBC
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Evaporation process - Loam soil, the BC model.
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E-LoamBCBW
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Evaporation process - Loam soil, the BC model combined with the Brunswick model.
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E-LoamKos
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Evaporation process - Loam soil, the Kosugi model.
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E-LoamKosBW
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Evaporation process - Loam soil, the Kosugi model combined with the Brunswick model.
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E-LoamVGM
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Evaporation process - Loam soil, the VGM model.
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E-LoamVGMBW
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Evaporation process - Loam soil, the VGM model combined with the Brunswick model.
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E-SandVGM
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Evaporation process - Sand soil, the VGM model.
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E-SandVGMBW
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Evaporation process - Sand soil, the VGM model combined with the Brunswick model.
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R-ClayF
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Transpiration process - the Feddes Model, Clay soil, the VGM model.
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R-ClayF-BW
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Transpiration process - the Feddes Model, Clay soil, the VGM model combined with the Brunswick model.
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R-ClayF
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Transpiration process - the Nimah && Hanks Model, Clay soil, the VGM model.
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R-ClayF-BW
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Transpiration process - the Nimah && Hanks Model, Clay soil, the VGM model combined with the Brunswick model.
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References
- Weber, T. K. D., W. Durner, T. Streck, and E. Diamantopoulos, A modular framework for modelling unsaturated soil hydraulic properties over the full moisture range, Water Resources Research, 55, 4994–5011, doi: 10.1029/2018WR024584, 2019.
- Weber, T. K. D., M. Finkel, M. da Conceição Gonçalves, H. Vereecken, and E. Diamantopoulos, Pedotransfer function for the Brunswick soil hydraulic property model and comparison to the van Genuchten‐Mualem model, Water Resources Research, 56, e2019WR026820, doi: 10.1029/2019WR026820, 2020.