[1]李泳,苏鹏程,苏凤环,等.从空间Poisson过程看蒋家沟泥石流[J].山地学报,2011,(05):586.
　LI Yong,SU Pengcheng,et al.Debris Flow as a Spatial Poisson Process[J].Mountain Research,2011,(05):586.
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从空间Poisson过程看蒋家沟泥石流()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2011年05期
页码:
586
栏目:
山地学报
出版日期:
2011-01-01

文章信息/Info

Title:
Debris Flow as a Spatial Poisson Process
作者:
李泳;苏鹏程;苏凤环;
1.中国科学院山地灾害与地表过程重点实验室，四川 成都 610041;
2.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;
3.中国科学院研究生院，北京 100049
Author(s):
LI Yong;  SU Pengcheng;  SU Fenghuan
1. Key Laboratory of Mountain Hazards and Surface Process, CAS, Chengdu 610041, China;
2. Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China;
3. Graduate University of CAS, Beijing 100049, China
关键词:
流域演化分区; 泥石流; Poisson过程; 流量分布; 蒋家沟
Keywords:
valley evolution and division;  spatial Poisson process;  debris flow;  discharge distribution;  Jiangjia Gully
分类号:
P64223
文献标志码:
A
摘要:
云南东川蒋家沟泥石流频率高,变化多。每场泥石流包含几十到几百个阵流,各阵流具有不同的密度、流体性质和运动形态,流量涨落达3个数量级。这些特征意味着泥石流具有很强的随机性。根据蒋家沟的演化分区和野外观测,可以发现泥石流形成于特殊的源地分支。土体活动(包括滑坡、崩塌和局部的土体流动等)随机发生在那些分支流域,如果认为各源地的土体活动是独立的,而且活动强度正比于源地的面积,那么泥石流的形成和汇流就是一个空间Poisson过程。其结果是阵流流量服从指数分布,这很好地符合蒋家沟的泥石泥观测数据。从蒋家沟泥石流的随机性可见,泥石流依赖于流域的特定源区及其分布,而不是笼统地取决于全流域的地貌或几何因子。
Abstract:
Debris flows in Jiangjia Gully present a variety of appearances and cover a wide spectrum of motion regime. Each event consists of surges of various viscosities, densities, velocities and discharges. The surges are temporally separated and fluctuate reasonably, with discharge ranging between orders of magnitude of 10~103 m3/s. These appearances can be attributed to the origins of debris flows from a special group of tributaries associated with specific evolution features. Field observations indicate that slope and channel processes are randomly distributed over the source areas and conform to the category of spatial Poisson process, meaning that the processes are independent of one another and the intensity is proportional to the area of the local source. Then a debris flow surge is actually a pooled process and the resulted intensity, i.e. the discharge in the circumstance, satisfies the exponential distribution. This agrees well with the observation in Jiangjia Gully. From the stochastic viewpoint, debris flow depends primarily on the spatial heterogeneity of valley and the local processes in tributaries, but not so much on the fullvalley parameters.

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备注/Memo

备注/Memo:
收稿日期(Received date)：2011-02-30；改回日期(Accepted) : 2011-07-20。
基金项目（Foundation item）：中国科学院知识创新工程重要方向项目(KZCX2-YW-Q03-5-2)，国家重点基础研究发展计划（973计划）项目（2011CB409902）。\[This research is supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YWQ03-5-2) and the National Program on Key Basic Research Project (973 Program) (2011CB409902).\]
作者简介（Biography）：李泳（1967-），主要从事泥石流和地貌过程的理论研究。\[Li Yong, Prof. of IMHE, CAS, current research is focused on the system dynamics of debris flow. \]E-mail: ylie@imde.ac.cn
更新日期/Last Update: 1900-01-01