Assessing the hydraulic reduction performance of HYDRUS-1D for application of alkaline irrigation in variably-saturated soils: Validation of pH driven hydraulic reduction scaling factors
Article
Article Title | Assessing the hydraulic reduction performance of HYDRUS-1D for application of alkaline irrigation in variably-saturated soils: Validation of pH driven hydraulic reduction scaling factors |
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ERA Journal ID | 5245 |
Article Category | Article |
Authors | Ali, Aram (Author), Bennett, John McL (Author), Biggs, Andrew A. J. (Author), Marchuk, Alla (Author) and Ghahramani, Afshin (Author) |
Journal Title | Agricultural Water Management |
Journal Citation | 256, pp. 1-13 |
Article Number | 107101 |
Number of Pages | 13 |
Year | 2021 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0378-3774 |
1873-2283 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.agwat.2021.107101 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0378377421003668 |
Abstract | Land application of alkaline irrigation water is an increasing practice in most agricultural lands around the world due to the shortage of freshwater resources. Accurate evaluation of the effects of alkalinity on soil properties is essential to avoid environmental risks. In this study, we used long leaching columns to evaluate alkalinisation and sodification hazards in soils in the laboratory at different water qualities (0, 100, 310 and 650 HCO3-, mg L−1) with electrical conductivity (EC) ≈ 2.1 dS m−1 and sodium adsorption ratio (SAR) ≈ 12 (mmolc L−1)0.5. The ability of the HYDRUS-1D model to simulate solute and water movement under unsaturated conditions in columns of 40 cm height filled with acidic, neutral or alkaline soils was also assessed. Changes in soil EC, SAR, pH and alkalinity were monitored at 5, 15, 25 and 35 cm depths for 290 days. Increased solution alkalinity resulted in increased pH, alkalinity and sodicity within the soil profile, in particular for the soil surface and acidic soils. In general, the HYDRUS model, using the standard hydraulic reduction scaling factor, was able to simulate the effects of alkalinity in the soil profile and the associated hydraulic conductivity reduction. Amending the pH driven hydraulic reduction scaling factor in the model to a non-linear, soil-specific, pedotransfer function significantly improved the correlation between predicted and observed hydraulic conductivity. The findings of this study provide validation for a non-linear approach towards determining the pH hydraulic reduction scaling factor in the HYDRUS-1D model for unsaturated conditions. However, it is noted that further improvement of this non-linear approach is required to incorporate other factors governing soil structural stability. |
Keywords | Alkalinity; Unsaturated condition; Sodicity; Hydraulic conductivity; Solute movement; HYDRUS-1D |
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 |
Department of Resources, Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6906/assessing-the-hydraulic-reduction-performance-of-hydrus-1d-for-application-of-alkaline-irrigation-in-variably-saturated-soils-validation-of-ph-driven-hydraulic-reduction-scaling-factors
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