黄土坡面径流输沙能力试验研究

为了建立合理的土壤侵蚀评价和预报模型,基于坡面流理论,通过室内径流冲刷模拟试验,以黄土坡面为研究对象.研究了坡面径流输沙能力.研究结果表明,当坡面侵蚀达到相对平衡时,在同一坡度条件下,坡面径流输沙率随流量的增加呈阶梯性增加,即表现为"缓一陡一缓一陡"的变化过程;坡面径流输沙率与坡度和流量之间存在指数函数关系,且流量对输沙率影响大于坡度;坡面径流输沙率与坡面径流切应力、单位水流功率及Re之间均存在着良好的线性关系.

Experimental Study on Sediment Transport Capacity of Sheet How over Loess Slope

In order to establish mathematical model for assessing and predicting the development trend of soil erosion,based on the theory of overland flow,sediment transport capacity of sheet flow is studied by the scouring experiment on loess slope.The results show that runoff sediment transport rate increases with the increase of the runoff discharge in stages on the same slope,the average sediment transport ratio increases with the flow discharge and the slope gradient in the exponential form,and the discharge has greater effect on it than the slope gradient.There is a good linear relationship between sediment transport ratio and the runoff shear stress,runoff power,Reynolds Number.