IMHE OpenIR  > 山地灾害与地表过程重点实验室
A depth-averaged two-phase model for debris flows over fixed beds
Li, Ji1; Cao, Zhixian1,2; Hu, Kaiheng3; Pender, Gareth2; Liu, Qingquan4
Corresponding AuthorCao, Zhixian(zxcao@whu.edu.cn)
2018-12-01
Source PublicationINTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
ISSN1001-6279
Volume33Issue:4Pages:462-477
AbstractA depth-averaged two-phase model is proposed for debris flows over fixed beds, explicitly incorporating interphase and particle-particle interactions, fluid and solid fluctuations and multi grain sizes. A first-order model based on the kinetic theory of granular flows is employed to determine the stresses due to solid fluctuations, while the turbulent kinetic energy - dissipation rate model is used to determine the stresses from fluid fluctuations. A well-balanced numerical algorithm is applied to solve the governing equations. The present model is benchmarked against USGS experimental debris flows over fixed beds. Incorporating the stresses due to fluid and solid fluctuations and properly estimating the bed shear stresses are shown to be crucial for reproducing the debris flows. Longitudinal particle segregation is resolved, demonstrating coarser sediments around the fronts and finer grains trailing the head. Based on extended modeling exercises, debris flow efficiency is shown to increase with initial volume, which is underpinned by observed datasets. (C) 2017 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved.
KeywordDebris flow Two-phase model Depth-averaged model Fluctuation kinetic energy Multi grain sizes
DOI10.1016/j.ijsrc.2017.06.003
Indexed BySCI
WOS KeywordFREE-SURFACE FLOWS ; PARTICLE-SIZE SEGREGATION ; GRANULAR-LIQUID MIXTURES ; SEDIMENT TRANSPORT ; JIANGJIA RAVINE ; MASS FLOWS ; AVALANCHES ; RUNOUT ; FLUIDIZATION ; GRAVITY
Language英语
Funding ProjectNatural Science Foundation of China[51279144] ; Natural Science Foundation of China[11432015] ; Chinese Academy of Sciences[KZZD-EW-05-01-03]
WOS Research AreaEnvironmental Sciences & Ecology ; Water Resources
WOS SubjectEnvironmental Sciences ; Water Resources
WOS IDWOS:000448207900008
Funding OrganizationNatural Science Foundation of China ; Chinese Academy of Sciences
PublisherIRTCES
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24363
Collection山地灾害与地表过程重点实验室
Corresponding AuthorCao, Zhixian
Affiliation1.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China
2.Heriot Watt Univ, Inst Infrastruct & Environm, Edinburgh Campus, Edinburgh EH14 4AS, Midlothian, Scotland
3.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
4.Beijing Inst Technol, Dept Mech, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Li, Ji,Cao, Zhixian,Hu, Kaiheng,et al. A depth-averaged two-phase model for debris flows over fixed beds[J]. INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,2018,33(4):462-477.
APA Li, Ji,Cao, Zhixian,Hu, Kaiheng,Pender, Gareth,&Liu, Qingquan.(2018).A depth-averaged two-phase model for debris flows over fixed beds.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,33(4),462-477.
MLA Li, Ji,et al."A depth-averaged two-phase model for debris flows over fixed beds".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 33.4(2018):462-477.
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