Analysis of Anti-scourability of Five Different Soils in Loess Plateau

REN Yan; XUE Jiaojiao; WANG Jian; ZHAO Pengxia

doi:10.13522/j.cnki.ggps.2017.04.008

Abstract：The incision and scour processes of five soils in the loess plateau under different slopes were investigated using an indoor flume experiment.In addition,the factors affecting the scour process,including slope,water flow rate,and sediment concentration were also examined.The results showed that when flow rate was 120 L/h,the erosion-resisting coefficients of the five soils decreased exponentially as the slop increased with a high determination coefficients.The anti-scourability of the fivesoils was in the order of clay loam of Yangling＞sandy clay loam of Yan'an＞ clay loam of Zhouzhi＞ sand clay of Zhidan ＞ sand clay of Jingbian.The erosion-resisting coefficients and water flow rates of all the five soil were negatively linearly related.The erosion per minute of the five soils increased substantially with the slope.With scouring time elapsing,the amount of erosion per minute reduced gradually.In addition,the amount of erosion in early stages was larger when the slope was steep.The erosion-resisting coefficients and sediment concentrations in the flowing water was linearly related for the five soils with a determination coefficients in the range of 0.857 7～0.957 5.With an change in sediment concentration in the flowing water,the soil with better anti-scourability has a more significant alteration in its erosion-resisting coefficients.