New insights into the correlation between soil thermal conductivity and water retention in unsaturated soils

dc.contributor.author Fu, Yongwei
dc.contributor.author Ghanbarian, Behzad
dc.contributor.author Horton, Robert
dc.contributor.author Heitman, Joshua
dc.contributor.department Agronomy
dc.date.accessioned 2024-01-04T21:58:14Z
dc.date.available 2024-01-04T21:58:14Z
dc.date.issued 2023-12-25
dc.description.abstract The heat transfer and water retention in soils, governed by soil thermal conductivity (λ) and soil water retention curve (SWRC), are coupled. Soil water content (θ) significantly affects λ. Several models have been developed to describe λ(θ) relationships for unsaturated soils. Ghanbarian and Daigle presented a percolation-based effective-medium approximation (P-EMA) for λ(θ) with two parameters: scaling exponent (ts) and critical water content (θc). In this study, we explored the new insights into the correlation between soil thermal conductivity and water retention using the P-EMA and van Genuchten models. The θc was strongly correlated to selected soil hydraulic and physical properties, such as water contents at wilting point (θpwp), inflection point (θi), and hydraulic continuity (θhc) determined from measured SWRCs for a 23-soil calibration dataset. The established relationships were then evaluated on a seven-soil validation dataset to estimate θc. Results confirmed their robustness with root mean square error ranging from 0.011 to 0.015 cm3 cm−3, MAE ranging from 0.008 to 0.013 cm3 cm−3, and R2 of 0.98. Further discussion investigated the underlying mechanism for the correlation between θc with θhc which dominate both heat transfer and water flow. More importantly, this study revealed the possibility to further investigate the general relationship between λ(θ) and SWRC data in the future.
dc.description.comments This article is published as Fu, Yongwei, Behzad Ghanbarian, Robert Horton, and Joshua Heitman. "New insights into the correlation between soil thermal conductivity and water retention in unsaturated soils." Vadose Zone Journal (2023): e20297. doi:https://doi.org/10.1002/vzj2.20297. © 2023 The Authors.<br/><br/>This is an open access article under the terms of the <a href="https://creativecommons.org/licenses/by-nc-nd/4.0/" target="_blank">Creative Commons Attribution-NonCommercial-NoDerivs</a> License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/NveomLgz
dc.language.iso en
dc.publisher Wiley Periodicals LLC on behalf of Soil Science Society of America
dc.source.uri https://doi.org/10.1002/vzj2.20297 *
dc.subject.disciplines DegreeDisciplines::Physical Sciences and Mathematics::Earth Sciences::Soil Science
dc.subject.disciplines DegreeDisciplines::Physical Sciences and Mathematics::Earth Sciences::Hydrology
dc.title New insights into the correlation between soil thermal conductivity and water retention in unsaturated soils
dc.type Article
dspace.entity.type Publication
relation.isAuthorOfPublication d3fb0917-6868-417e-9695-a010896cfafa
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
File
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
2023-Horton-NewInsights.pdf
Size:
1.92 MB
Format:
Adobe Portable Document Format
Description:
Collections