Effect of initial soil moisture content on infiltration characteristics of water-repellent clay loam
LIU Chang1,2, CHEN Junying1,2*, ZHANG Lin2, CAI Yaohui1,2, REN Guangdong3
1.College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China; 3.Shenwo Re-servoir Administration of Liaoning Province, Liaoyang, Liaoning 111000, China
Abstract:To explore the effect of the initial moisture content on water-repellent soil infiltration process, the wetting front movement distance, horizontal-vertical ratio, cumulative infiltration volume, infiltration rate and soil water content change with different initial moisture contents were stu-died by a drip irrigation experiment in two-dimensional soil box with 6 initial moisture content levels(4.78%,7.28%,9.97%,13.64%,16.07%,19.02%), and the applicability of the infiltration models were evaluated. The Results show that with the increase of initial moisture content, the time that wetting front moving the same depth required was gradually decreased, and there was a better po-wer function relationship between movement distance and time, and the horizontal-vertical ratio of wetting front decreased gradually. The cumulative infiltration volume decreased first,then increased, and the overall trend of infiltration rate was gradually decreasing, and the water-repellent soil samples′ infiltration rate were increasing briefly. The infiltration law of water-repellent clay loam can be better reflected by Kostiakov model. The higher the soil water repellency, the lower the model′s fitting precision. Soil moisture was concentrated on the middle area in the vertical direction, where appeared an excessive saturation phenomenon with the increase of water repellency.
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