水土保持学报2011，Vol.25Issue(2)：19-23,5.
人工模拟降雨条件下紫色土陡坡地侵蚀泥沙变化特征研究
Study on Variation Characteristics of Eroded Sediment in Purple Soil Steep Slope Land Based on Simulated Rainfall
摘要
Abstract
The response characteristic of eroded sediment in 25° runoff plots was studied based on three different simulated rainfall intensity which were 0. 285 mm/min,0. 978 mm/min and 1.737 mm/min, respectively.The results were as follows: The quantity of runoff sediment increased firstly and then reduced gradually and tended to be stable finally with the runoff duration extended during rainfall process. The time of peak quantity of eroded sediment occurred brought forward constantly along with the increase of rainfall intensity during runoff generation process. Accumulative sediment-runoff of slope runoff showed a relationship of power function with the increase of runoff duration. Accumulative sediment runoff with large rainfall intensity was obviously larger than that of small rainfall intensity. With the same runoff duration, when rainfall intensity were 0. 285 mm/min,0. 978 mm/min and 1. 737 mm/min, the content of sand in eroded sediment decreased roughly, and the content of clay and silt increased roughly with the increase of runoff duration. But the variation of particle size composition of eroded sediment was obvious different under different rainfall intensities.The larger rainfall intensity was, the better eroded sediment particle size composition and runoff duration regression model fit.关键词
人工模拟降雨/紫色土/陡坡地/侵蚀泥沙Key words
simulated rainfall/ purple soil/ steep slope land/ eroded sediment分类
农业科技引用本文复制引用
高敏,牛青霞,王茹,陈晓燕,魏朝富..人工模拟降雨条件下紫色土陡坡地侵蚀泥沙变化特征研究[J].水土保持学报,2011,25(2):19-23,5.基金项目
西南大学博士基金项目(SWU110023) （SWU110023）
国家科技支撑计划重点项目(2008BAD98B01) （2008BAD98B01）
西南大学生态学重点学科"211 工程"建设经费资助项目 （）
