Incorporating solution alkalinity into a hydraulic reduction model to account for disaggregation and dispersion
Article
Article Title | Incorporating solution alkalinity into a hydraulic reduction model to account for disaggregation and dispersion |
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ERA Journal ID | 5257 |
Article Category | Article |
Authors | Ali, Aram (Author), Bennett, John McL. (Author), Biggs, Andrew J. W. (Author) and Marchuk, Alla (Author) |
Journal Title | Geoderma |
Journal Citation | 413, pp. 1-11 |
Article Number | 115742 |
Number of Pages | 11 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0016-7061 |
1872-6259 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.geoderma.2022.115742 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0016706122000490 |
Abstract | The use of alkaline and sodic water for irrigation has increased in recent years due to constrained freshwater sources and a rapid increase in industrial by-product wastewater from industries such as coal seam gas and effluent management from other industrial sources. The use of alkaline sodic water can significantly impact soil condition, in particular soil physical properties. The threshold electrolyte concentration (CTH) is generally used to assess soil structural stability when it is subjected to a solution of a given sodium adsorption ratio and electrolyte concentration. The current disaggregation model commonly used is mainly based on the sodium and calcium system, without considering the adverse effects of alkaline anions (e.g., HCO3–) reducing saturated hydraulic conductivity (Ks). This study aimed to assess the incorporation of HCO3– into the semi-empirical disaggregation model approach to determine CTH. The percentage reduction in Ks increased with increasing solution alkalinity and this reduction rate was dependent on soil type. The results indicated that there is a correlation between the reduction of Ks produced by non-alkaline and alkaline solutions represented as SAR and adjusted SAR (SARadj) for up to 30% Ks reduction. This association confirms that the effect of SAR and SARadj on CTH are similar. Therefore, HCO3– can be incorporated into the current disaggregation model to determine CTH (≤20% Ks reduction) for alkaline irrigation waters when disposed of on lands. |
Keywords | Alkaline water; Hydraulic conductivity; Salinity; Sodicity; Threshold electrolyte concentration; Wastewater |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 410605. Soil physics |
410699. Soil sciences not elsewhere classified | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Sustainable Agricultural Systems |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q715v/incorporating-solution-alkalinity-into-a-hydraulic-reduction-model-to-account-for-disaggregation-and-dispersion
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