Analysis of the Relation Between the Characteristics Factors of Precipitation and Slope Soil Erosion

Using the sand-filled subgrade slope at Xinyang to Nanyang area in Shanghai to Shanxi highway as research object.21 runoff plots were established by runoff field and the relation between the characteristics factors of precipitation and slope soil erosion was quantitatively analysed.The results showed that there was a strong correlation between the erosive rainfall amount,the erosive average rainfall intensity and the amount of soil erosion,rainfall erosivity R value and the amount of soil erosion,as well as precipitation level and the amount of soil erosion,there was no evident correlation between the duration of rainfall and the amount of soil erosion.There was a poor correlation between precipitation of 3,5 and 7 days before erosire rainfall and amount of soil erosion.The analysis results can provide scientific basis for improving the accuracy of soil erosion prediction,effectively preventing and reducing soil erosion of subgrade slope.