水土保持学报2017，Vol.31Issue(4)：11-17,7.DOI:10.13870/j.cnki.stbcxb.2017.04.003
雨强对华北土石山区坡面侵蚀及其颗粒富集过程的影响
Effects of Rainfall Intensity on Slope Erosion and Sediment Particles Enrichment Process in the Rocky Mountain Area of North China
摘要
Abstract
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 4 different 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 30 mm/h to 120 mm/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 120 mm/h rainfall intensity;(3) When the rainfall intensity increased from 30 mm/h to 120 mm/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.关键词
人工模拟降雨/华北土石山区/雨强/侵蚀泥沙/富集率Key words
simulated rainfall/the rocky mountain area of North China/rainfall intensity/erosion sediment/enrichment rate分类
农业科技引用本文复制引用
薛孟君,马岚,张栋,梅雪梅,孙一惠,陈佩岩..雨强对华北土石山区坡面侵蚀及其颗粒富集过程的影响[J].水土保持学报,2017,31(4):11-17,7.基金项目
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) （2015BAD07B030201）
