[1]郭晓军,李泳,崔鹏,等.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,(04):406.
　GUO Xiaojun,LI Yong,CUI Peng.Exponential Amplification Effect of Rainfall on Slope Failures in Debris Flow Source Region[J].Mountain Research,2013,(04):406.
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降雨对泥石流源地土体活动的指数式放大效应()

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《山地学报》[ISSN:1008-2186/CN:51-1516]

Title:: Exponential Amplification Effect of Rainfall on Slope Failures in Debris Flow Source Region

作者:: 郭晓军;李泳;崔鹏;; 1.中国科学院山地灾害与地表过程重点实验室/中国科学院水利部成都山地灾害与环境研究所，四川成都610041；
2. 中国科学院大学，北京100049

Author(s):: GUO Xiaojun; LI Yong; CUI Peng; 1. Key Laboratory of Mountain Hazards and Land Surface Progress/ Institute of Mountain Hazards and Environment,CAS,Chengdu 610041,China;
2. University of Chinese Academy of Sciences, Beijing100049,China

Keywords:: debris flow source region; collapses; rainfall intensity; amplification effect; debris flow surges

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...

Abstract:: 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 Weijia 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 = CNCM 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.

备注/Memo:: 收稿日期(Received date)：2012-12-18；改回日期(Accepted)：2012-12-25。
基金项目（Foundation item）：中科院重点部署项目(KZZD-EW-05-01-02)；国家科技支撑计划课题2012BAC06B02。[Key Deployment Project of Chinese Academy of Sciences(Grant No. KZZD-EW-05-01-02) and National key Tecohiologies R&D Program of China(Gran No.2012BAC06B02).]
作者简介（Biography）：郭晓军（1985-），男，山西运城人，博士。主要研究方向为水文学和泥石流。[Guo Xiaojun(1985-), male, born in Shanxi Province, doctor and mainly engaged in hydrology and debris flow. ] E-mail:aarongua@imde.ac.cn *通信作者(Corresponding author):李泳（1967-），男，研究员，研究方向：自然地理和自然灾害。[Li Yong (1967-), male, professor and interested in physical geography and nature disasters]. E-mail: ylie@imde.ac.cn

更新日期/Last Update: 1900-01-01