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汶川地震次生泥石流形成模式与机理
Alternative TitleFormation mode and mechanism for debris flow induced by Wenchuan earthquake
杨成林1,2,3; 陈宁生1,3; 李战鲁1,3
2011
Source Publication自然灾害学报
ISSN1004-4574
Volume7Issue:3Pages:31-37
SubtypeArticle
Contribution Rank1
Abstract以汶川地震灾区的典型的代表性泥石流案例为基础,分析了汶川地震次生泥石流的形成地形地貌、降水和土源条件特征,概括分析了汶川地震泥石流形成的5种模式,即:(1)沟床启动型;(2)坡面崩滑转化型;(3)震裂表土侵蚀启动型;(4)滑坡表面土体液化型和(5)松散坡积物冲切沟启动型。分析了这些形成模式的启动机理。地震次生泥石流的形成机理包括土力类和水力类。泥石流的形成需要一定的细颗粒含量,尤其是粘土颗粒含量;此外低密度干燥度较高的土体在降雨作用下易湿陷,体积收缩,从而有利于土体孔隙水压力的升高,而有利土体强度的降低,导致泥石流的启动。所以地震灾区的泥石流集中分布于干旱河谷松散固体物质大量存在且以花岗岩风化壳和碎屑岩及其变质岩为主的地区,降雨量特征与国内外众多泥石流的降雨特征可以比较,其模式多样。
Other AbstractThis paper is based on combination study of the "5.12" Wenchuan earthquake-induced typical debris flow events.In the paper the debris flow landscape and landform,the precipitation and the earth condition were studied firstly.After that the Wenchuan earthquake debris flow-triggering models were revealed.These models include (1)valley triggering;(2)slope collapse and landslide triggering;(3)loose soil'eroded by stream and rains;(4)landslide surface liquefied;(5)gully eroded.And the debris flow-triggering mechanism was explained at last.The debris flows of quake - stricken area distribute in the arid valley which abounds in weathered crust granite,clastic rock and metamorphic rock,and the precipitation nodes
Keyword泥石流 汶川地震 山地灾害 灾害防治
DOI10.13577/j.jnd.2011.0306
Indexed ByCSCD
Language中文
CSCD IDCSCD:4256725
Citation statistics
Cited Times:14[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25988
Collection山地灾害与地表过程重点实验室
Corresponding Author陈宁生
Affiliation1.中国科学院山地灾害与地表过程重点实验室;
2.中国科学院研究生院;
3.中国科学院水利部成都山地灾害与环境研究所
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding 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
杨成林,陈宁生,李战鲁. 汶川地震次生泥石流形成模式与机理[J]. 自然灾害学报,2011,7(3):31-37.
APA 杨成林,陈宁生,&李战鲁.(2011).汶川地震次生泥石流形成模式与机理.自然灾害学报,7(3),31-37.
MLA 杨成林,et al."汶川地震次生泥石流形成模式与机理".自然灾害学报 7.3(2011):31-37.
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