1. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China; 2. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China; 3. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China
Abstract：Laboratory irrigation experiments carried on manually filled soil columns were conducted to study the effects of oil concentration in irrigation water (i.e. 0, 1.0, 3.0and 10.0g/L), irrigation frequency (irrigated every day, once every two days, and once every four days), and oil laden water and freshwater alternative irrigation schedule (irrigated with freshwater only, with oil laden water only, and with oil laden water and freshwater alternatively) on soil structural properties and water flow characteristics. The results showed that, the applied oil was mainly entrapped in the preferential flow paths, making the preferential wetting front with high oil concentration which was not obviously affected by the oil concentration in irrigated water, illustrating that irrigation with low oil concentration water also present groundwater system under high contamination risk; higher irrigation frequency with lower irrigation quota led to more applied oil being transmitted to deeper soil layer, increasing the thickness of water repellent soil layer, and deriving the uncertainty of infiltrated water flow and the contamination risk of groundwater system both increased; the re-aggregation feature of oil on soil aggregates was only activated under high soil oil concentration, and the alternative irrigation with oil laden water and freshwater reduced the soil oil concentration, inducing the dispersion of soil aggregates. This research had certain reference value for reclaimed water and raw sewage irrigation scheduling design.
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SHENG Feng, WEN Ding, XUE Ru-xia, ZHANG Min, HU Guo-hua, SHEN Hong-wei. Effects of oil in irrigation water on structural properties and water flow characteristics of red soil. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3546-3558.
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