Relationship between grain composition and debris flow characteristics: a case study of the Jiangjia Gully in China

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部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

	Relationship between grain composition and debris flow characteristics: a case study of the Jiangjia Gully in China
	Li, Yong1,2 ; Liu, Jingjing1,2,3 ; Su, Fenghuan1,2 ; Xie, Jiang1,3 ; Wang, Baoliang1,3
刊名	LANDSLIDES
	2015-02-01
卷号	12 期号:1 页码:19-28
关键词	Debris flow Grain size distribution Flow fluctuation Power law constraints
ISSN号	1612-510X
通讯作者	Liu Jingjing
英文摘要	Debris flow occurs frequently (ten events on average per year) and displays a great variety of properties in the Jiangjia Gully (JJG) in southwest China. We find that the material of debris flow satisfies a universal grain size distribution (GSD) of P (D) = CD(-mu)exp(-D/D-c), and the parameters mu and D-c are closely related to the dynamical properties such as flow density, velocity, and discharge. A small mu implies a small porosity and possible high excess pore pressure in flow, reflecting high mobility and capacity of transportation, and a large D-c means a wide range of grain composition and hence a high grain concentration. A debris flow always achieves a state of certain mobility and density that can be well described by mu and D-c, and the parameters impose power law constraints on the fluctuations of debris flow surges. An upper limit of unit-width discharge is estimated as Q(u) = 1.25 D-c 1.12. Variation of GSD parameters also describes material exchanges between debris flow and streambed sediment. Intense incision or deposition occurs when remarkable difference of grain composition exists. As the GSD is satisfied universally, the results derived from JJG are expected to be applicable for evaluating the properties and peak discharge of a potential debris flow in other conditions.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Geological ; Geosciences, Multidisciplinary
研究领域[WOS]	Engineering ; Geology
关键词[WOS]	NEW-ZEALAND ; MT THOMAS ; RIVERS
收录类别	SCI
原文出处	http://link.springer.com/article/10.1007%2Fs10346-014-0475-z
语种	英语
WOS记录号	WOS:000352147000002
公开日期	2014-12-02
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/7486]
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
作者单位	1.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Li, Yong,Liu, Jingjing,Su, Fenghuan,et al. Relationship between grain composition and debris flow characteristics: a case study of the Jiangjia Gully in China[J]. LANDSLIDES,2015,12(1):19-28.
APA	Li, Yong,Liu, Jingjing,Su, Fenghuan,Xie, Jiang,&Wang, Baoliang.(2015).Relationship between grain composition and debris flow characteristics: a case study of the Jiangjia Gully in China.LANDSLIDES,12(1),19-28.
MLA	Li, Yong,et al."Relationship between grain composition and debris flow characteristics: a case study of the Jiangjia Gully in China".LANDSLIDES 12.1(2015):19-28.