One-dimensional vertical infiltration of water under gravel fragments condition
WEI Tong1, TAN Junli 1,2,3*, GE Min1, MA Zhongsheng1
1.Civil and Hydraulic School, Ningxia University, Yinchuan, Ningxia 750021, China; 2.Engineering Research Center of the Ministry of Education for Modern Agricultural Water Resources High Efficiency in Arid Areas, Yinchuan, Ningxia 750021, China; 3.Enginee-ring and Technology Research Center of Water-saving and Water Resources Regulation in Ningxia, Ningxia University, Yinchuan, Ningxia 750021, China
In order to study the effect of sand press on the vertical infiltration law of soil moisture, sandy and loam soils were selected as the research object. The soil column experiment was used to simulate the effect of sand and loam on the vertical movement of water infiltration under sand pressure. We set separately two kinds of soil without pressure sand control test and analyzed the effect of sand pressure on the vertical movement of water infiltration of two kinds of soil. The results show that gravel fragments improve the infiltration capacity of the soil including the sand layer, but inhibit the infiltration performance of the soil under the sand layer. The empirical equation between cumulative infiltration and infiltration time that is obtained through function fitting has a great degree of synergy. Sand pressure conditions have a greater impact on the initial infiltration rate of the soil. The initial infiltration rate of sandy soil under pressure sand conditions is 1.67 times that of non-pressure sand and 2.37 times that of loam, and the effect of sand pressure on the infiltration rate of loam is even greater. Obviously, stable infiltration rate is small, and sand pressure has no obvious effect on the infiltration rate of the two soils. Sand pressure can inhibit the depth of the two soils with the change of cumulative infiltration, and the inhibitory effect on the loam is stronger. The relationship between the depth of the wetting front and the cumulative infiltration of both soils after removal of the sand layer is approximately linear.
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