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Depositional mechanisms and morphology of debris flow: physical modelling

文献类型：期刊论文

作者Zhou, Gordon G. D.1,2; Li, Shuai1,2; Song, Dongri1,2; Choi, Clarence E.2,3,4,5; Chen, Xiaoqing1
刊名LANDSLIDES
出版日期2019-02-01
卷号16期号:2页码:315-332
关键词Debris flow Flume model tests Deposit morphology Flow regimes Grain size segregation
ISSN号1612-510X
DOI10.1007/s10346-018-1095-9
通讯作者Li, Shuai(lishuai@imde.ac.cn)
英文摘要A comprehensive understanding of the deposition mechanisms and morphology of debris flows is necessary to delineate the extent of a debris flow hazard. However, due to the wide range of debris flow compositions and the complex topography in the field, there remains a deficiency of fundamental understanding on how the effects of grain-size distribution, water content, and channel slope influence the deposition mechanisms and morphology of debris flow. In this study, a series of experimental tests were carried out using a flume with a horizontal outflow plane to discern the effects of particle size, water content, and slope on the deposition morphology and grain size segregation on the deposition fan. Results reveal that the experimental debris flows are under either viscous or collisional flow regimes. Most experimental debris flow fronts lack high pore fluid pressures, emphasizing the formation of deposits via grain-grain and grain-bed friction and collisions; also high excess pore fluid pressure (positive) behind the front head is measured and it is beneficial for the mobility of debris flows. Both the deposit area and runout-width ratio are positively correlated to the Bagnold and Savage numbers and the initial water contents. Furthermore, an increase of fines content reduces the runout distance. However, this feature is not as obvious for high water content flows (w=28.5% in this study). Moreover, smoother transition topography between the transportation and deposition zone leads to longer runout distances. For debris flows with a high solid fraction (C-s>0.52 in this study), particle sorting is quite inhibited in the deposit fan.
WOS关键词FLUIDIZED GRANULAR MASSES ; 3-DIMENSIONAL TERRAIN ; RUNOUT ; FIELD ; AVALANCHES ; LANDSLIDE ; MOBILITY ; BEHAVIOR ; CHANNEL
资助项目National Natural Science Foundation of China[11672318] ; National Natural Science Foundation of China[41731283] ; Youth Innovation Promotion Association, Chinese Academy of Sciences (CAS) ; CAS Light of West China Program[Y6R2220220] ; CAS Pioneer Hundred Talents Program ; Research Grants Council of the Government of Hong Kong SAR, China[T22-603/15-N]
WOS研究方向Engineering ; Geology
语种英语
WOS记录号WOS:000460468500009
出版者SPRINGER HEIDELBERG
资助机构National Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences (CAS) ; CAS Light of West China Program ; CAS Pioneer Hundred Talents Program ; Research Grants Council of the Government of Hong Kong SAR, China
源URL[http://ir.imde.ac.cn/handle/131551/25319]  
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
通讯作者Li, Shuai
作者单位1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Hong Kong Univ Sci & Technol, HKSAR, Dept Civil & Environm Engn, Hong Kong, Peoples R China
4.HKUST Jockey Club Inst Adv Study, HKSAR, Hong Kong, Peoples R China
5.HKUST Fok Ying Tung Grad Sch, Guangzhou, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Zhou, Gordon G. D.,Li, Shuai,Song, Dongri,et al. Depositional mechanisms and morphology of debris flow: physical modelling[J]. LANDSLIDES,2019,16(2):315-332.
APA Zhou, Gordon G. D.,Li, Shuai,Song, Dongri,Choi, Clarence E.,&Chen, Xiaoqing.(2019).Depositional mechanisms and morphology of debris flow: physical modelling.LANDSLIDES,16(2),315-332.
MLA Zhou, Gordon G. D.,et al."Depositional mechanisms and morphology of debris flow: physical modelling".LANDSLIDES 16.2(2019):315-332.

入库方式： OAI收割

来源：成都山地灾害与环境研究所

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