水科学进展2018，Vol.29Issue(2)：204-212,9.DOI:10.14042/j.cnki.32.1309.2018.02.007
四川紫色土区强降雨情况下泥沙输移突增的临界条件
Critical conditions for sudden increase of sediment transport under heavy rainfall in purple soil regions of Sichuan
摘要
Abstract
Understanding key factors affecting sediment transport and the threshold of sediment transport in a heavy rainfall is crucial to preventing sediment disasters and reducing soil erosions.In this study,the small watershed of Hemingguan,a purple soil region in Sichuan Province,is chosen as a typical area for research.The methods of statistical classification and comparison are used to analyze sediment transport data in recent 10 years.The influence of subrainfall and rainfall intensity and duration on the sudden increase of sediment transport is studied.The key factors and the threshold leading to the sudden increase of sediment transport are clarified.The resuhs indicate that,in a typical Sichuan purple soil area,key factors for a sudden increase in sediment transport are sub-rainfall,rainfall intensity and the maximum runoff modulus.The threshold for rainfall intensity is 5.3 mm/h.The threshold for rainfall is 130 mm,and the threshold for the maximum runoff modulus of slope land is 6 000 dm3/(km2· s),based on tillage.The threshold for the maximum runoff modulus of slope land is 3 000 dm3/(km2·s),based on planting grass and trees.关键词
紫色土区/泥沙输移突增/次降雨量/降雨强度/降雨历时/最大径流模数Key words
purple soil region/sudden increase of sediment transport/sub-rainfall/rainfall intensity/rainfall duration/maximum runoff modulus分类
交通工程引用本文复制引用
彭清娥,刘兴年,黄尔,赵明辉..四川紫色土区强降雨情况下泥沙输移突增的临界条件[J].水科学进展,2018,29(2):204-212,9.基金项目
国家自然科学基金资助项目(51639007) （51639007）
国家重点研发计划资助项目(2016YFC0402302)The study is financially supported by the National Natural Science Foundation of China(No.51639007) and the National Key R&D Program of China(No.2016YFC0402302). （2016YFC0402302）
