Experiment on one-dimensional infiltration characteristics of clay loam soil with different water repellency
CHAI Hongyang1,2, CHEN Junying1,2*, ZHANG Lin3, WANG Jiarui1,2, LIU Chang1,2
1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; 3. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
To explore the effect of water repellency on the infiltration characteristics of clay loam, indoor water infiltration experiment was conducted in this paper. There were five kinds of clay loam with different water repellency degrees. The investigated soil water infiltration characteristics include wetting front, infiltration rate, cumulative infiltration, soil moisture and water redistribution. The applicability of three soil infiltration empirical models under different water repellency conditions was analyzed. The results showed that the soil infiltration rate was reduced, and the time required for wetting front migration was increased significantly with increasing water repellency. The time for the wetting front to travel the same distance was increased significantly, especially the time for 40 cm travelling distance in soil with strong repellency was 63% longer than that in hydrophilic soil. With increasing water repellency, the cumulative infiltration was reduced and the cumulative infiltration of S4 was decreased by 27% compared with S0 at the end of infiltration. The infiltration rate was also decreased with the increase of water repellency, and the saturated infiltration rate was 37% of that in hydrophilic soil. Both the moisture of soil profile and the change in moisture of redistributed soil profile in the same time were decreased with increasing water repellency. The power function model can simulate the migration process of wet front and the variation of cumulative infiltration with time. For the soil with slight repellence, the Philip model and the Kostiakov model were subject to a better accuracy in fitting the relationship between infiltration rate and time, while the Kostiakov model was even more suitable for the soil with strong repellency. The study can provide a basis for the infiltration theory of repellent soil.
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