The gullies are formed by the processes of infiltration-interflow-collapses. (2) In the slope with sand-loess,the major factors of water erosion are the rainfall intensity and rainfall amount of annual first rainfall. (3) In the region,the evolution proce
The gullies are formed by the processes of infiltration-interflow-collapses. (2) In the slope with sand-loess,the major factors of water erosion are the rainfall intensity and rainfall amount of annual first rainfall. (3) In the region,the evolution proce
(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。