Development of a soil specific function for scaling hydraulic conductivity reduction using alkaline irrigation water in HYDRUS model

Ali, Aram ORCID: https://orcid.org/0000-0003-2986-9220 and Bennett, John McL and Biggs, Andrew J. W. and Simunek, Jirka (2021) Development of a soil specific function for scaling hydraulic conductivity reduction using alkaline irrigation water in HYDRUS model. In: 2021 Joint Australia and New Zealand Soil Science Conference, 27 Jun - 2 Jul 2021, Cairns, Australia.

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Abstract

Soil structure stability and hydraulic conductivity are important soil physical properties in agriculture and hydrology. This study aimed to review and evaluate the current scaling hydraulic conductivity reduction factor in HYDRUS model. Nine Australian soils with contrasting properties were selected to determine saturated hydraulic conductivity reduction using different irrigation water with pH of 6 , 7, 8 and 9 at electrolyte concentration of 0.8, 1.5, 2.5, 5.0, 10, 25 and 5 dS.m-1 and sodium adsorption ratio of 20 and 40. The results of hydraulic conductivity were used to develop a generalised function for scaling hydraulic conductivity similar to the current HYDRUS standard function for effects of pH on soil hydraulic dynamics. A nonlinear model was also developed with considering soil clay content and pH and electrolyte concentration of applied irrigation water. The comparison of observed hydraulic conductivity reduction and predicted results indicates that the developed models objectively well predicted the change in hydraulic dynamics due to pH of irrigation water for Australian and Californian soils. The nonlinear model performed greater prediction for individual soils compared to newly generalised model and HYDRUS standard model. Therefore, nonlinear model needs to be considered in future HYDRUS developments.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Date Deposited: 09 Aug 2021 00:57
Last Modified: 16 Aug 2021 23:48
Uncontrolled Keywords: hydraulic conductivity, alkalinity, HYDRUS-1D, alkalinity
Fields of Research (2008): 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4106 Soil sciences > 410605 Soil physics
41 ENVIRONMENTAL SCIENCES > 4106 Soil sciences > 410699 Soil sciences not elsewhere classified
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9614 Soils > 961499 Soils not elsewhere classified
Socio-Economic Objectives (2020): 18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180605 Soils
URI: http://eprints.usq.edu.au/id/eprint/43197

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