Study on the characteristics of moist soil under the condition of water supply of surface capillary

Abstract

In order to explore the characteristics of moist soil under the condition of water supply of surface capillary, this research constructed device which screens the capillary source infiltration based on the tests. Embedding TDR monitoring instrument in the indoor soil box, it can detect the characteristics of moist soil under the conditions of different capillary source infiltration water percolating capacities. The results show that there is a power function relationship between the cumulative infiltration quantity and time under the condition of water supply of surface capillary. The wetting front pushes forward like semi ellipse curve, and the moist soil presents like approximate semi ellipsoid. When the infiltration time and infiltration rate are constant, the soil water content in the infiltration point tends to a stable value, the soil water and heat coupling movement is complex, and the numerical variation tendency of each monitoring point is similar. Based on the above results, we construct empirical solution equation to predict the eigenvalues of soil wetting body under the condition of water supply of surface capillary. In this research, the capillary source infiltration material is found, and the surface capillary source water supply device with low cost and high efficiency is constructed. The device makes the growth of plants with enough water for the first year, but it can still keep the roots dry enough to make the seedling root down. Preventing soil evaporation loss, slowing down water loss of the surface micro environment of the main land and other bad influence, the device can improve the efficiency of water use. Meanwhile, the device can effectively enhance the ability of seedlings against high temperature of the surface in desertification area, wind-blown sand, animal browsing stress, damage, and create a proper environment for the normal growth of plants, which enjoys broad prospects.