IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2013  > Vol10 No.2
Influence of Fine Sediment on the Fluidity of Debris Flows
Norifumi HOTTA; Takahiro KANEKO; Tomoyuki IWATA; Haruo NISHIMOTO
Corresponding AuthorNorifumi HOTTA
2013-04
Source PublicationJournal of Mountain Science
Volume10Issue:2Pages:233-238
AbstractDebris flows include a great diversity of grain sizes with inherent features such as inverse grading, particle size segregation, and liquefaction of fine sediment. The liquefaction of fine sediment affects the fluidity of debris flows, although the behavior and influence of fine sediment in debris flows have not been examined sufficiently. This study used flume tests to detect the effect of fine sediment on the fluidity of laboratory debris flows consisting of particles with various diameters. From the experiments, the greatest sediment concentration and flow depth were observed in the debris flows mixed with fine sediment indicating increased flow resistance. The experimental friction coefficient was then compared with the theoretical friction coefficient derived by substituting the experimental values into the constitutive equations for debris flow. The theoretical friction coefficient was obtained from two models with different fine-sediment treatments: assuming that all of the fine sediments were solid particles or that the particles consisted of a fluid phase involving pore water liquefaction. From the comparison of the friction coefficients, a fully liquefaction state was detected for the fine particle mixture. When the mixing ratio and particle size of the fine sediment were different, some other cases were considered to be in a partially liquefied transition state. These results imply that the liquefaction of fine sediment in debris flows was induced not only by the geometric conditions such as particle sizes, but also by the flow conditions.
KeywordDebris Flow Fine Sediment Friction Coefficient Liquefaction Open Channel Reynolds Stress
DOI10.1007/s11629-013-2522-y
Language英语
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5212
CollectionJournal of Mountain Science_Journal of Mountain Science-2013_Vol10 No.2
Corresponding AuthorNorifumi HOTTA
Recommended Citation
GB/T 7714
Norifumi HOTTA,Takahiro KANEKO,Tomoyuki IWATA,et al. Influence of Fine Sediment on the Fluidity of Debris Flows[J]. Journal of Mountain Science,2013,10(2):233-238.
APA Norifumi HOTTA,Takahiro KANEKO,Tomoyuki IWATA,&Haruo NISHIMOTO.(2013).Influence of Fine Sediment on the Fluidity of Debris Flows.Journal of Mountain Science,10(2),233-238.
MLA Norifumi HOTTA,et al."Influence of Fine Sediment on the Fluidity of Debris Flows".Journal of Mountain Science 10.2(2013):233-238.
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