Abstract:In order to study the effects of different surface relief forms on runoff and sediment yield during slope erosion process, five kinds of surface relief treatments (mounds, depressions, Intervals mound and depression, continuous mound and depression, smooth) were set up. The runoff and sediment yield of each treatment under three rainfall intensities (60 mm/h, 90 mm/h, 120 mm/h) by field artificial rainfall experiments were analyzed. The results showed that:(1) Under three rain intensities, the initial runoff time of the smooth surface was the shortest, while the continuous mound and depression surface was the longest. The initial runoff time of intervals mound and depression surface was close to continuous mound and depression surface, while mounds surface was just a little longer than the smooth one. The runoff time of depression surface was in the middle. The shorter the initial runoff time was, the bigger the runoff volume and runoff coefficient were. (2) Under the same rain intensity, the sediment volume and sediment yield intensity of different treatments ranked as:continuous mound and depression surface < intervals mound and depression surface < depressions surface < smooth surface < the mound surface. The greater the sediment yield intensity was, the more unstable the sediment yield process was. (3) Compared to the smooth surface, the mound aggravated soil loss, while the depression reduced soil loss. When mounds and depressions were combined, the reduction of soil loss was more significant. (4) Increasing rainfall intensities weakened the effect of different surface reliefs on runoff and sediment yield. The conclusion was that the different types of surface relief affected the runoff and sediment yield significantly. Runoff occurred most easily on smooth surface, and soil loss was most serious on mound surface, as well as the conservation of soil and water was best on continuous mound and depression surface.