Effects of non-state discharge on ephemeral gully erosion sediment and hydraulic parameters

The ephemeral gully erosion occupies an important position in the loess plateau erosion. The previous studies on ephemeral gully erosion always do scour experiment under constant flow rate condition. However, under practical conditions, the flow is changing. Few studies are conducted on non-state water flow. We analyzed the effects of non-state discharge on ephemeral gully erosion sediment and hydraulic parameters on plow land of the slope of 14°. Three non-state water flow rates (10-15, 15-20, 20-25L/min) and three constant water flow rates (10, 15 and 20L/min) were designed in the experiment. Results indicated that compared to the non-state discharge, flow velocity and Reynolds number，Froude number and Shear force, stream power and runoff sediment rate of the constant water flow decreased by 6.64%-13.44%, 2.73%-8.26%, 6.15%-49.59%, 0.27%-10.27%, 4.27%-15.77% and 2.02%-19.36% respectively; and the Daycy-weisbach coefficient increased by 23.45%-43.41%.