喷施Jag C162对黄土坡面水流切应力影响研究

Effects of Spraying Jag C162 on Flow Shear Stress on Loess Slope

为研究连续两场次降雨过程中喷施不同剂量Jag C162对黄土坡面水流切应力的调控效应,在20°坡度,2.0mm/min雨强条件下对裸坡和喷施Jag C162剂量为1,3,5g/m^2的坡面进行连续两场模拟降雨试验,主要结论有:(1)在连续两场降雨过程中,裸坡和喷施不同剂量Jag C162的坡面水流切应力随降雨历时的变化皆呈先增加后趋于稳定的状态,都可用对数方程描述,且喷施不同剂量Jag C162的坡面水流切应力皆比裸土坡面水流切应力小,喷施不同剂量Jag C162的坡面产流时间也均晚于裸土坡面产流时间;(2)在连续两场次降雨过程中,Jag C162具有减小坡面水流切应力的作用,且随Jag C162剂量增大,其对坡面水流切应力影响的持效性增强;(3)综合考虑Jag C162对坡面水流切应力调控作用的稳定性及持效性,建议在连续两场次降雨中采用剂量5g/m^2的Jag C162调控坡面水流切应力,以期达到控制土壤侵蚀的目的。

To study the regulation of Jag C162 on flow shear stress on the loess slope,the chemical regulation of surface water and sediment process were monitored under two continuous simulated rainfall experiments with the rainfall intensities of 2.0mm/min,slopes of 20°,Jag C162 dosage of 1,3,5g/m^2 in way of spraying.The main results are as follows.（1）On two simulated rainfall experiments,the flow shear stress of bare slope and slope with spraying different doses of Jag C162 first increase,and then presented the stability,and the processes could be described by the logarithmic equation.The variation values of flow shear stress of bare slope are greater than those of flow shear stress of slope with spraying different doses of Jag C162,the runoff yields on the slope with spraying different doses of Jag C162 were later than those on the bare slope,and the initial of stable trend on the slope with spraying different doses of Jag C162 was also later than the bare slope.（2）In the process of continuous rainfall,Jag C162 could reduce the flow shear stress on slope surface,and significantly narrow the difference of shear stress between two rainfall events;with Jag C162 doses increasing,the effects of Jag C162 on the slope surface shear stress enhanced.（3）Considering the influence of Jag C162 on reducing flow shear stress on slope surface,Jag C162 dose of 5g/m^2 was recommended to research regulation of Jag C162 on the slope surface flow hydraulic parameters,and control the soil erosion on loess slope.