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颗粒组成与泥石流运动的涨落
Alternative TitleGrain Composition and the Fluctuation of Debris Flow Motion
李泳1; 苟万春1,3; 王保亮4; 刘道川1,3
Corresponding Author李泳
2016
Source Publication山地学报
ISSN1008-2786
Volume34Issue:4Pages:468-475
Other Abstract泥石流物源、流体和堆积物的颗粒分布满足P(D)=CDexp(-D/Dc),其中参数C,μ和Dc由传统的粒径分布特征决定。μ随细颗粒(特别是粘粒)含量的增大而增大,Dc刻画粒径的范围,且随粗粒含量而增大。蒋家沟泥石流的观测表明,同一场泥石流包含着数十到数百个不同性质、流态和规模的阵流。阵流的涨落和多样性是与流体的颗粒组成密切相关的。一定的颗粒组成对应着一定的饱和颗粒浓度,决定一定的饱和流体状态。阵流的涨落,是在没有达到饱和状态时的随机运动的状态。阵流涨落随Dc增大而趋于平缓;当流体达到饱和态时,阵流达到最大的流深、流速和流量,且与颗分参数(μ,Dc)具有幂函数关系。运用本文的方法,可根据颗分参数来预估泥石流的性质和规模。 ; Debris flow body is composed of a wide range of grains and Its grain size distribution (GSD) is found to satisfy a general expression,P(D) = CD-μexp(-D/Dc).The grain composition can be described by the GSD parameters (μ,Dc),with μ representing fine content and Dc defining a characteristic scale of grain aggregate.It is found that the fluid has a coupled (μ,Dc) which is distinct from the source materials and deposits.Observations on debris flows in the Jiangjia Gully (JJG) have revealed great fluctuations; we fourd that the fluctuations are controlled by thair grain composition,and they will approach some steady state when granular concentration were saturated,and then both the flow depth and velocity gained a power-law relationship regardiy μ and Dc.From the method introduced here it is possible to use the GSD parameters of the sedimentary materials to estimate the probably maximal discharge and velocity of a debris flow.
Keyword泥石流演化 颗粒分布 随机过程 动力学参数 泥石流评估
Subject AreaP642.23
DOI10.16089/j.cnki.1008-2786.000152
Indexed ByCSCD ; 北大中文核心
Language中文
CSCD IDCSCD:5805084
Funding Organization国家自然科学基金项目(No.41471011)
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/17578
Collection山地灾害与地表过程重点实验室
Affiliation1.中国科学院山地灾害与地表过程重点实验室
2.中国科学院水利部成都山地灾害与环境研究所
3.中国科学院大学
4.西南交通大学土木工程学院
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
李泳,苟万春,王保亮,等. 颗粒组成与泥石流运动的涨落[J]. 山地学报,2016,34(4):468-475.
APA 李泳,苟万春,王保亮,&刘道川.(2016).颗粒组成与泥石流运动的涨落.山地学报,34(4),468-475.
MLA 李泳,et al."颗粒组成与泥石流运动的涨落".山地学报 34.4(2016):468-475.
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