Modification of the McNeal clay swelling model improves prediction of saturated hydraulic conductivity as a function of applied water quality
Article
Article Title | Modification of the McNeal clay swelling model improves prediction of saturated hydraulic conductivity as a function of applied water quality |
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ERA Journal ID | 5276 |
Article Category | Article |
Authors | Ezlit, Y. D. (Author), Bennett, J. McL. (Author), Raine, S. R. (Author) and Smith, R. J. (Author) |
Journal Title | Soil Science Society of America Journal |
Journal Citation | 77 (6), pp. 2149-2156 |
Number of Pages | 8 |
Year | 2013 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0361-5995 |
1435-0661 | |
Digital Object Identifier (DOI) | https://doi.org/10.2136/sssaj2013.03.0097 |
Web Address (URL) | https://acsess.onlinelibrary.wiley.com/doi/abs/10.2136/sssaj2013.03.0097 |
Abstract | A review of the McNeal clay swelling model, including its underpinning assumptions and the method for determining its parameters, was undertaken. Limitations of the model include model parameter identification, the fixed threshold exchangeable sodium percentage level at which hydraulic conductivity begins to decline, and the assumption that the expanding clay will always be 10% of the soil. To overcome these problems, an improved form of the model that accommodates a range of clay content is proposed. The modified model was used to estimate the reduction in saturated hydraulic conductivity in the three McNeal groups of soils containing different percentages of expanding clay. The model produced good agreement between the observed and estimated saturated hydraulic conductivities over the entire range of irrigation salinity (3–200 mmolc/L) and sodicity used for the original swelling model. The modified model was also successfully validated against three new sets of relative hydraulic conductivity data. The generalization of interlayer clay swelling in the modified model is more appropriately described as determining the dispersive potential of a given solution, rather than physical interlayer swelling. Consequently, this modified model more accurately predicts the reduction in saturated hydraulic conductivity as a function of the sodicity and salinity of the applied water. |
Keywords | salinity; irrigation; clay soils; McNeal model |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 410406. Natural resource management |
410605. Soil physics | |
410601. Land capability and soil productivity | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Tripoli, Libya |
National Centre for Engineering in Agriculture | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q220x/modification-of-the-mcneal-clay-swelling-model-improves-prediction-of-saturated-hydraulic-conductivity-as-a-function-of-applied-water-quality
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