Renmin Zhujiang (Jan 2020)
Research on Impacts of Different Slope Gradientson Runoff and Sediment Yield in Dabie Mountains
Abstract
Dabie Mountains is a national key prevention and protection area for water and soilloss. Aiming at the problem of soil and water loss in Dabie Mountains, and taking the field flowplot of the soil and water conservation test station in Huoshan County as an example, this paperanalyzes the runoff and sediment data of different slopes in 2017, and discusses the variationrules of the runoff and sediment yield under different slopes in the Dabie Mountains, and theimpacts of different slopes on runoff and sediment yield in the Dabie Mountains by the linearregression equation and typical precipitation events to provide basis for prevention and controlof soil and water loss in Dabie Mountains. The results indicate that:①Under the sameconditions of rainfall, rain intensity and precipitation duration, the slope gradient has agreater impact on the runoff and sediment yield of the test runoff plot. The effect of rainfall onthe runoff and sediment yield on different slopes is continuous. ②In the case of the samerainfall, the greater the slope is, the more slope runoff becomes. At the same time, the sloperunoff has significantly correlation with the rainstorm and large rainstorm. Moreover, thecorrelation coefficient is 0.52, which is greater than 0.50 always. ③The correlation betweensediment yield and precipitation intensity is high, and the correlation coefficient is 0.56, whichis greater than 0.50 always In addition, the precipitation intensity of large rainstorm has thegreatest impact on the sediment yield on the slope, and the sediment produced under this conditionaccounts for 92% of total sediment.
