Influence of Fine Sediment on the Fluidity of Debris Flows
文献类型：期刊论文
| 作者 | Norifumi HOTTA ; Takahiro KANEKO ; Tomoyuki IWATA ; Haruo NISHIMOTO |
| 刊名 | Journal of Mountain Science
 |
| 出版日期 | 2013-04 |
| 卷号 | 10期号:2页码:233-238 |
| 关键词 | Debris flow Fine sediment Friction coefficient Liquefaction Open channel Reynolds stress |
| 通讯作者 | Norifumi HOTTA |
| 英文摘要 | Debris 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. |
| 语种 | 英语 |
| 公开日期 | 2013-04-26 |
| 源URL | [http://192.168.143.20:8080/handle/131551/5212]  |
| 专题 | 成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2013_Vol10 No.2 |
| 推荐引用方式 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. |
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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