摘要
汶川震区分布着大量的窄陡型泥石流沟,在强降雨作用下易形成突发性泥石流灾害。在实地调查的基础上,通过对169条泥石流沟地形参数统计分析,从窄陡型泥石流沟的“窄”、“陡”基本特征出发,重点研究流通区沟道宽度、流通区及形成区沟床平均纵比降,获得窄陡泥石流沟具体参数为:形成区和流通区平均纵比降大于250‰;流通区最大宽度不超过40 m且流通区最小宽度不超过10 m,当不满足这两个宽度条件时,若其流通区平均宽度小于20 m,也确定为窄陡型沟道;在此基础上总结窄陡型泥石流沟降雨特征及物源特征,可为泥石流类型认识及窄陡型泥石流灾害研究提供参考。
A large number of debris flow gullies distribute in the Wenchuan strong earthquake region,one kind of which is defined as narrow-steep channel debris flow.The debris flows were happened easily due to the quickly converge of the rainfall.Based on the field investigation,the topographic parameters of 169 debris flow gullies were analyzed.The gully average longitudinal slope is more than 250‰,the maximum width of the circulation area is less than 40 m,and the minimum width is not more than 10 meters.If these two width conditions are not satisfied,and the average width of the circulation area is less than 20 m,which will also be defined as narrow and steep channel.The rainfall and debris source characteristics in the narrow and steep debris flow gully are summarized to provide reference for the understanding of debris flow types,and for the study of the narrow and steep debris flow disaster.
作者
赵宾杰
余斌
常鸣
杨凌崴
ZHAO Bin-jie;YU Bin;CHANG Ming;YANG Ling-wei(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;College of Energy and Building Environment,Guilin University of Aerospace Technology,Guilin 541004,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2021年第5期61-67,40,共8页
Journal of Sediment Research
基金
国家重点研发计划课题(2018YFC1505405)
国家自然科学基金项目(41672341)
地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2017Z002)。
关键词
沟床平均纵比降
流通区沟道宽度
窄陡型泥石流沟
average longitudinal slope
channel width of circulation area
debris flow in narrow-steep channels
