@misc{10481/85791,
year = {2023},
url = {https://hdl.handle.net/10481/85791},
abstract = {We developed a novel, lognormal, pore-scale, unsaturated hydraulic
conductivity model, K(ψ)model, which does not require saturated hydraulic conductivity, Ks, as an input parameter. K(ψ)model is derived solely from hydraulic parameters describing a bimodal, lognormal, pore-scale, soil water retention
curve θ(ψ).
The K(ψ)model is based on the Hagen‒Poiseuille equation, which represents the soil as a bundle of parallel, non-intersecting capillary tubes. To improve the modelling of fine-textured soils we introduced a novel model to consider the clay‒water interaction. This model assumes that clay‒water interaction occurs for soils having more than 30% of clay and an effective matrix porosity greater than 35%.
Compared to previously developed models, the K(ψ)model does not require the use of integrals and can be computed from a spreadsheet and distinguishes between macropore (non-equilibrium) and matrix (equilibrium) flows.
The K(ψ)model gives improved results when the hydraulic parameters are dynamically constrained and when θ(ψ) describes a bimodal, lognormal distribution.
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keywords = {Unsaturated hydraulic conductivity},
keywords = {Lognormal distribution pore scale},
keywords = {Tortuosity},
keywords = {Hydraulic parameters},
keywords = {Fine-textured soils},
keywords = {Non-uniqueness},
title = {Bimodal unsaturated hydraulic conductivity derived from water retention parameters by accounting for clay‒water interactions: deriving a plausible set of hydraulic parameters},
doi = {10.1016/j.jhydrol.2023.130227},
author = {Pollacco, J.A.P. and Fernández Gálvez, Jesús and de Jong van Lier, Q.},
}