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《Journal of Soil and Water Conservation》 2017-04
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Effects of Rainfall Intensity on Slope Erosion and Sediment Particles Enrichment Process in the Rocky Mountain Area of North China

XUE Mengjun;MA Lan;ZHANG Dong;MEI Xuemei;SUN Yihui;CHEN Peiyan;Key Laboratory of Soil and Water Conservation and Desertification Combating,Ministry of Education,School of Soil and Water Conservation,Beijing Forestry University;  
In order to research the impact of rainfall intensity on slope erosion process and distribution of sediment particles in the rocky mountain area of North China,two typical soils from this area were selected,and the variation of runoff,the composition of particles and the enrichment rate of particles in erosion sediment were analyzed under 4different rainfall intensities(30,60,90,and 120 mm/h)through rainfall simulation experiments in laboratory.The results were as follows:(1)With the rainfall intensity increased from 30mm/h to 120mm/h,the time producing runoff decreased by 79% and 85%for the loess cinnamon soil and calcic cinnamon soil,respectively;(2)Under the 60,90,and 120 mm/h rainfall intensity,runoff intensity and sediment concentration of the loess cinnamon soil decreased first and then increased with rainfall time extending,and then tended to be stable,while runoff intensity and sediment concentration of calcic cinnamon soil appeared similar trend only under 120mm/h rainfall intensity;(3)When the rainfall intensity increased from 30mm/h to 120mm/h,the content of coarse particle increased in the lost sediment for the loess cinnamon soil,and the contents of sand and coarse silt increased by 86% and 21%,respectively.However,there was no obviously change for the calcic cinnamon soil;(4)In the initial stage of rainfall,the clay and fine silt enriched obviously,and the coarse silt and sand were not easy to be lost,while with the extending of rainfall the enrichment rate of different sediment particles gradually approached to 1,especially under heavy rain.
【Key Words】: simulated rainfall the rocky mountain area of North China rainfall intensity erosion sediment enrichment rate
【Fund】: 华北土石山区防护林体系景观格局调控与空间配置技术研究项目(2015BAD07B030201)
【CateGory Index】: S157.1
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