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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
Corresponding AuthorLiu Jingjing
2015
Source PublicationLANDSLIDES
ISSN1612-510X
EISSN1612-5118
Volume12Issue:1Pages:19-28
SubtypeArticle
AbstractDebris 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.
KeywordDebris Flow Grain Size Distribution Flow Fluctuation Power Law Constraints
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1007/s10346-014-0475-z
URL查看原文
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
WOS KeywordNEW-ZEALAND ; MT THOMAS ; RIVERS
Language英语
Quartile3区
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WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000352147000002
Funding OrganizationNational Natural Science Foundation of China(41201010) ; Chinese Academy of Sciences(KZZD-EW-05-01) ; Key Laboratory of Mountain Hazards and Surface Process, CAS
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Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/7486
Collection山地灾害与地表过程重点实验室
Affiliation1.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
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
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.
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