Distribution characteristics of complex soil and response simulation of subsurface drainage
The existence of barrier soil layer in saline-alkali land may cause that the drainage project can not play its role which also poses a great challenge to the its treatment.Hongshibao,Ningxia Hui Autonomous Region was taken as a typical area.The distribution characteristics of complex soil in different plots were investigated based on field sampling,the drainage effect of different location of clay layer on discharge of subsurface drainage were analyzed based on the simulation of HYDRUS 2D,and the suggestion for drainage under complex soil conditions was put forward.The results showed that when the soil has weak permeable layer without treatment measures,the soil salinity of the land was generally high.The location of the weak permeable layer does not have a fixed position and characteristics,the thickness of the weak permeable layer was usually 10-20 cm.When the clay layer was located at the pipe layer,10 cm of clay layer leads to a 20%reduction in the discharge of the subsurface drainage.The effect of the clay layer located at 10 cm soil layer above the pipe on the discharge was the largest with a 22%reduction than conventional subsurface drainage.While when the clay layer was located at the depth of double pipe depth,the effect of clay layer was small.According to the location of weak permeable layers,a reasonable drainage and salt drainage method was of great importance to the improvement of saline-alkali land.
万方数据
维普
