降雨对泥石流源地土体活动的指数式放大效应 | |
郭晓军![]() ![]() ![]() | |
刊名 | 山地学报
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2013 | |
卷号 | 31期号:4页码:406-412 |
关键词 | 泥石流源地 土体崩塌 雨强 指数式变化 泥石流阵流 |
其他题名 | Exponential Amplification Effect of Rainfall on Slope Failures in Debris Flow Source Region |
通讯作者 | 李泳 |
中文摘要 | 多数泥石流是从坡面活动开始的。坡面的不稳定土体活动,如崩塌、滑坡等,既是泥石流的物质来源,也决定着泥石流的形成方式和规模变化。四川汶川牛圈沟和北川魏家沟泥石流源地坡面人工降雨实验表明,坡面土体活动是间歇、涨落的随机过程,崩塌的时间间隔随着降雨强度的增大呈指数减小,每组实验中的崩塌总数目和雨强的关系如N=CN exp(kN IR);崩塌规模随着降雨强度的增大呈指数增大,每组实验中平均崩塌量与雨强的关系如M=CMexp(kM IR);坡面崩塌的总量可以表示为:V=NM=CNCM exp((kN+kM)IR);受土体颗粒粒径的影响,不同坡面崩塌量随雨强变化的参数不同,研究揭示了大规模泥石流的形成是由于源地土体活动强度随雨强的指数式增强。 |
英文摘要 | Most debris flows are formed by slope failures, performing as landslides, collapses, and so on, which not only supply solid materials in debris flows, but also control the formation approach and magnitude variety. Field artificial rainfall experiments on slopes in debris flow source region in Niujuan Gully in Wenchuan County and Wei- jia Gully in Beichuan County show that the slope failure is actually a random, discontinues process with fluctuation in magnitude. The collapse interval exponentially decreases, while collapse magnitude exponentially increases with rainfall intensity. The relationship between collapse number, average collapse magnitude and the rainfall intensity can be described as N = CN exp(kN IR) and M = CMexp (kM IR) , thus the total collapse amount can be expressed as V = NM = CNCu exp ( (kN + kM)IR). The parameters in the equation is various due to the viriety of grain composition of the soils on slopes. This study shows the exponential amplification effect of rainfall on slope failure intensity, which can be regarded as the formation mechanism of giant debris flow in rain storms. |
学科主题 | 灾害学 |
分类号 | P642.23 |
收录类别 | CSCD |
资助信息 | 中科院重点部署项目(KZZD-EW-05-01-02);国家科技支撑计划课题2012BAC06802 |
语种 | 中文 |
CSCD记录号 | CSCD:4970032 |
公开日期 | 2013-12-21 |
内容类型 | 期刊论文 |
源URL | [http://ir.imde.ac.cn/handle/131551/6673] ![]() |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
推荐引用方式 GB/T 7714 | 郭晓军,崔鹏,李泳. 降雨对泥石流源地土体活动的指数式放大效应[J]. 山地学报,2013,31(4):406-412. |
APA | 郭晓军,崔鹏,&李泳.(2013).降雨对泥石流源地土体活动的指数式放大效应.山地学报,31(4),406-412. |
MLA | 郭晓军,et al."降雨对泥石流源地土体活动的指数式放大效应".山地学报 31.4(2013):406-412. |
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