Abstract:Characteristics of wet body under moistube-irrigation were clarified experimentally based on clay loam soil in the paper. Three pressure heads(1.5, 2.0 and 2.5 m)were used in our experiments to identify infiltration rate, cumulative infiltration, wet body volume and water content distribution cha-racteristics. Additionally, the clogging performance of moistube was addressed by using the water with 1.0 g/L sediment content under these pressures. Results show that the cumulative infiltration of the soil is positively correlated with pressure head but negatively correlated with time. In the muddy water experiment with 0.061-0.100 mm sediment particle diameters, the pressure head is positively correlated with flow rate. In the initial period of the experiment, however, the flow rate under one pressure head differs little from that under another pressure head. Just after 24 hours, the flow rate exhibits a noticeable difference between different pressure heads gradually. This fact suggests that the increase of pressure head can improve the clogging performance of moistube. The wet body is like a cylinder, and wet front advancing radius is positively correlated with pressure head; particularly, a prediction model relating pressure head and wet body volume is established. The wet front diffusion indices in various directions are about 0.42 at various pressure heads. The water content distribution in a wet body is concentric; specially, the content decreases with increasing radius and has its maximum value at 2 mm from the moistube wall. The principal driving forces for water migration in the soil are pressure head and soil potential energy. These outcomes can provide theoretical basis in a scientific manner for moistube-irrigation.
樊二东,王新坤*,肖思强,徐胜荣,朱燕翔. 压力水头对微润灌溉土壤水分运移试验研究[J]. 排灌机械工程学报, 2019, 37(11): 986-992.
FAN Erdong, WANG Xinkun*, XIAO Siqiang, XU Shengrong, ZHU Yanxiang. Experimental study of pressure head on water migration in soil under moistube-irrigation. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(11): 986-992.
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