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在片沙覆盖的黄土丘陵区，由于恶劣的自然环境及松散的地表组成物质，土壤的水蚀过程明显地不同于典型的黄土丘陵区。通过在神木县六道沟实验基地典型坡段的人工降雨模拟试验，揭示出一些土壤水蚀过程的特殊机理。（１）有片沙覆盖的斜坡小区，径流量少，但径流含沙率大，坡沟的形成过程是：垂直渗流—坡地潜流—崩塌；（２）在沙黄土斜坡小区，每年春末夏初降雨的强度及降雨量是决定坡面产沙量的关键因素；（３）该区坡沟系统的形成发育是风沙沉积、风蚀与水蚀交替作用的结果。
Loess hilly areas covered by sand and sand, due to poor natural environment and loose surface composition of materials, soil erosion process is obviously different from the typical loess hilly region. Through the artificial rainfall simulation test at the typical slope of Liudaogou Experimental Basement in Shenmu County, some special mechanisms of soil erosion process are revealed. (1) there is a small area of slope covered by sheet sand, with small runoff but large runoff sedimentation rate. The formation process of slope ditch is: vertical seepage - slope undercurrent - collapse; (2) The intensity of initial rainfall and rainfall are the key factors that determine the sediment yield of the slope. (3) The formation and development of the slope ditch system in this area is the result of the alternation of sand deposition, wind erosion and water erosion.