Variation in grain size distribution in debris flow
文献类型：期刊论文
| 作者 | Li Yong1,2 ; Wang Bao-liang1,3; Zhou Xiao-jun3,4; Gou Wan-chun1,3
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| 刊名 | JOURNAL OF MOUNTAIN SCIENCE
 |
| 出版日期 | 2015-05-01 |
| 卷号 | 12期号:3页码:682-688 |
| 关键词 | Debris flow Grain size distribution Flow fluctuation Power-law constraints |
| ISSN号 | 1672-6316 |
| 通讯作者 | LI Yong |
| 英文摘要 | Grain composition of debris flow varies considerably from fluid to deposit, making it uncertain to estimate flow properties (e.g., density, velocity and discharge) using deposit as done in practice. Tracing the variation of grain composition is thus more important than estimating some certain properties of flow because every debris flow event consists of a series of surges that are distinct in properties and flow regimes. We find that the materials of debris flows, both the fluid and the source soils, satisfy a universal grain size distribution (GSD) in a form of P (D) = CD - mu exp( -D/D (c)), where the parameters C, mu and D (c) are determined by fitting the function to the grain size frequency. A small A mu implies a small porosity and possible high excess pore pressure in flow; and a large D (c) means a wide range of grain composition and hence a high sediment concentration. Flow density increases as A mu decreases or D (c) increases, in a power law form. A debris flow always achieves a state of certain mobility and density that can be well described by the coupling of A mu and D (c) , which imposes a constraint on the fluctuations of flow surges. The GSD also describes the changes in grain composition in that it is always satisfied during the course of debris flow developing. Numerical simulation using the GSD can well illustrate the variation of A mu and D (c) from source soils to deposits. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 类目[WOS] | Environmental Sciences |
| 研究领域[WOS] | Environmental Sciences & Ecology |
| 关键词[WOS] | SOIL POROSITY ; NEW-ZEALAND ; MT THOMAS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000355429000014 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/9102]  |
| 专题 | 成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2015_Vol12 No.3 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 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100081, Peoples R China 4.China Merchants Chongqing Commun Res & Design Ins, Chongqing 400067, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Yong,Wang Bao-liang,Zhou Xiao-jun,et al. Variation in grain size distribution in debris flow[J]. JOURNAL OF MOUNTAIN SCIENCE,2015,12(3):682-688. |
| APA | Li Yong,Wang Bao-liang,Zhou Xiao-jun,&Gou Wan-chun.(2015).Variation in grain size distribution in debris flow.JOURNAL OF MOUNTAIN SCIENCE,12(3),682-688. |
| MLA | Li Yong,et al."Variation in grain size distribution in debris flow".JOURNAL OF MOUNTAIN SCIENCE 12.3(2015):682-688. |
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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