Effects of wind and water double erosion on characteristics of runoff and sediment from slope lands

In order to investigate the interaction of wind and water double erosion in the crisscross region of wind-water erosion on the Loess Plateau, the experiment of wind tunnel combined with simulated rainfall was conducted, and the effects of wind-water erosion on the characteristics of infiltration, runoff and sediment on slope were analyzed. The results showed the runoff producing time under water erosion was increased by moderate wind erosion intensity treatment with a wind speed of 14 m/s compared with no wind erosion. However, light wind erosion intensity treatment with a wind speed of 11 m/s hardly affected slope runoff producing time (P>0.05). Compared with no wind erosion, wind erosion intensity treatment could reduce rainfall infiltration rate by 2.9%-10.0%, increase slope runoff intensity and erosion rate by 4.5%-21.7% and 7.3%-39.0% respectively. Rainfall infiltration rate, slope runoff intensity and erosion rate had no significant difference between two wind speeds (P>0.05), but these factors reduced with the increment of rainfall intensity. Slope roughness increased obviously under wind and water double erosion. Under the wind speed at 14 m/s and rainfall intensity at 100 mm/h, slope roughness was 3 times higher than that under wind speed of 11 m/s and rainfall intensity 60 mm/h. The study provides theoretical foundation for evaluating the effect of wind and water double erosion.