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Mean Velocity Estimation of Viscous Debris Flows
Yang, Hongjuan1,2; Wei, Fangqiang2; Hu, Kaiheng2
Corresponding AuthorFangqiang Wei
AbstractThe mean velocity estimation of debris flows, especially viscous debris flows, is an important part in the debris flow dynamics research and in the design of control structures. In this study, theoretical equations for computing debris flow velocity with the one-phase flow assumption were reviewed and used to analyze field data of viscous debris flows. Results show that the viscous debris flow is difficult to be classified as a Newtonian laminar flow, a Newtonian turbulent flow, a Bingham fluid, or a dilatant fluid in the strict sense. However, we can establish empirical formulas to compute its mean velocity following equations for Newtonian turbulent flows, because most viscous debris flows are turbulent. Factors that potentially influence debris flow velocity were chosen according to two-phase flow theories. Through correlation analysis and data fitting, two empirical formulas were proposed. In the first one, velocity is expressed as a function of clay content, flow depth and channel slope. In the second one, a coefficient representing the grain size nonuniformity is used instead of clay content. Both formulas can give reasonable estimate of the mean velocity of the viscous debris flow.
KeywordDebris Flow Velocity One-phase Flow Two-phase Flow Viscous
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedGeology
Indexed BySCI
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000339462600018
Funding OrganizationNational Natural Science Foundation of China(41201011) ; Chinese Academy of Sciences (CAS)(KZZD-EW-05-01) ; Institute of Mountain Hazards and Environment, CAS(SDSQB-2013-01)
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, 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
Yang, Hongjuan,Wei, Fangqiang,Hu, Kaiheng. Mean Velocity Estimation of Viscous Debris Flows[J]. JOURNAL OF EARTH SCIENCE,2014,25(4):771-778.
APA Yang, Hongjuan,Wei, Fangqiang,&Hu, Kaiheng.(2014).Mean Velocity Estimation of Viscous Debris Flows.JOURNAL OF EARTH SCIENCE,25(4),771-778.
MLA Yang, Hongjuan,et al."Mean Velocity Estimation of Viscous Debris Flows".JOURNAL OF EARTH SCIENCE 25.4(2014):771-778.
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