Effects of up-slope runoff and sediment on ephemeral gully erosion sediment and hydraulic parameters
CHE Xiao-Li, WANG Wen-Long, GUO Jun-Quan, HAN Fang-Fang
1.College of Resources and Environment, Northwest A&F University, 712100, Yangling ,Shaanxi; 2.State Key Laboratory of Soil Erosion and Dryland Farming, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi; 3.Yan'an Vocational and Technical College,716000, Yan’an, Shaanxi；4.College of Environ Science & Engineering, Chang’an University,710064, Xi’an: China
Abstract：The ephemeral gully erosion was an important issue and had great distribution in the Loess Plateau. The runoff and sediment from up-slope had great impacts on slope soil erosion. In this paper, its effect on down-slope ephemeral gully erosion sediment yield and hydrodynamic parameters were analyzed by water discharge scouring experiments in fields, with the designed discharge 5L/min,10L/min and 15L/min on the slope of 26°. The results indicated that the runoff from up-slope increased the flow velocity. The Reynolds number, Froude number, stream power and shearing force increased by 33%-76%, 21%-47%, 29%-72%, 18%-42% respectively, and the Daycy-Weisbach coefficient decreased by 11%-13%, which caused the increasing sediment of the ephemeral gully erosion. Except the flow velocity and Froude number, the other hydrodynamic parameters increased over the water discharge scouring time. There was a power relationship between ephemeral gully relative increment sediment yield caused by up-slope runoff and relative increment of the stream power and shearing force.
车小力1，王文龙1，2，郭军权3，韩芳芳4. 上方来水来沙对浅沟侵蚀产沙及水动力参数的影响[J]. 中国水土保持科学, 2011, 9(3): 26-31.
CHE Xiao-Li, WANG Wen-Long, GUO Jun-Quan, HAN Fang-Fang. Effects of up-slope runoff and sediment on ephemeral gully erosion sediment and hydraulic parameters. SSWCC, 2011, 9(3): 26-31.
2011, Vol. 9 
