Microscopic Description of Basal Stress Generated by Granular Free-Surface Flows
文献类型：期刊论文
| 作者 | Du, Junhan2,3; Zhou, Gordon G. D.1,2,3 ; Cui, Kahlil F. E.2,3
|
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
 |
| 出版日期 | 2023-05-01 |
| 卷号 | 128期号:5页码:19 |
| 关键词 | granular flow basal stress flow regime granular temperature |
| ISSN号 | 2169-9003 |
| DOI | 10.1029/2022JF006953 |
| 通讯作者 | Zhou, Gordon G. D.(gordon@imde.ac.cn) |
| 英文摘要 | Geophysical flows grow in volume and impact potential by eroding and entraining bed material during movement, posing potential risks to human lives and facilities downstream. This granular process is controlled by the basal stress and its fluctuations at the flow-bed interface. Therefore, it is essential to provide physical insights into the basal stresses generated by granular flows for hazard risk management. In this study, we conduct a series of DEM simulations of channelized granular free-surface flows to gain a micromechanical understanding of particle-bed interactions. Basal normal and shear stresses are recorded and analyzed quantitatively through three statistical metrics: time-averaged mean value, maximum value, and standard deviation. The relationship of these quantities with the bulk and basal flow properties and the micromechanical quantities that control stress fluctuations are discussed. Results show that the basal stress exhibits a distinct transition from a dense to dilute flow regime at a critical Savage number of 0.1, coinciding with the transition of stress-generating and transmission mechanisms from being friction-dominated to collision-dominated. Maximum basal normal and shear stresses scale with the particle-bed impact velocities in the form of a power law relation. Stress fluctuations scale with the granular temperature, revealing its dependence on random particle motions. A unified scaling law is proposed to link the standard deviation of basal stresses with the free particle volume, covering a wide range of flow regimes from dense to dilute flow. |
| WOS关键词 | EVOLUTION ; PATTERNS ; PHYSICS ; MODEL |
| 资助项目 | Key Collaborative Research Program of the Alliance of International Science Organizations[ANSO-CR-KP-2021-07] ; National Natural Science Foundation of China[12250410257] ; CAS Light of West China Program ; Sino-German Mobility Program[M-0145] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001000239500001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | Key Collaborative Research Program of the Alliance of International Science Organizations ; National Natural Science Foundation of China ; CAS Light of West China Program ; Sino-German Mobility Program |
| 源URL | [http://ir.imde.ac.cn/handle/131551/57426]  |
| 专题 | 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 |
| 通讯作者 | Zhou, Gordon G. D. |
| 作者单位 | 1.CAS HEC, China Pakistan Joint Res Ctr Earth Sci, Islamabad, Pakistan 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Du, Junhan,Zhou, Gordon G. D.,Cui, Kahlil F. E.. Microscopic Description of Basal Stress Generated by Granular Free-Surface Flows[J]. JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,2023,128(5):19. |
| APA | Du, Junhan,Zhou, Gordon G. D.,&Cui, Kahlil F. E..(2023).Microscopic Description of Basal Stress Generated by Granular Free-Surface Flows.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,128(5),19. |
| MLA | Du, Junhan,et al."Microscopic Description of Basal Stress Generated by Granular Free-Surface Flows".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 128.5(2023):19. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。