Effects of bed longitudinal inflexion and sediment porosity on basal entrainment mechanism: insights from laboratory debris flows
文献类型：期刊论文
| 作者 | Li, Pu4; Wang, Jiading4; Hu, Kaiheng1,2,3 ; Shen, Fei5
|
| 刊名 | LANDSLIDES
 |
| 出版日期 | 2021-02-16 |
| 页码 | 22 |
| 关键词 | Debris flow Entrainment mechanism Non-uniform channel Bed longitudinal inflexion Sediment porosity Erosion waves |
| ISSN号 | 1612-510X |
| DOI | 10.1007/s10346-020-01618-w |
| 通讯作者 | Wang, Jiading(wangjd@nwu.edu.cn) |
| 英文摘要 | Channel morphology and bed sediment erodibility are two crucial factors that significantly affect debris flow entrainment processes. Current debris flow entrainment models mostly hypothesize the erodible beds are infinite with uniform slopes. In this study, a series of small-scale flume experiments were conducted to investigate the effects of bed longitudinal inflexion and sediment porosity on basal entrainment characteristics. Experimental observations revealed that sediment entrainment is negligible at early stages and accelerates rapidly as several erosion points appear. Continual evolution of flow-bed interfaces changes interactions between debris flows and bed sediments, rendering the interfacial shear action involved into a mixed shear and frontal collisional action. Lower bed sediment porosity will change the spatial arrangement and orientation of particle mixture, strengthen the interlocking and anti-slide forces of adjacent sediment particles, and promote the formation of particle clusters, all of which will increase bed sediment resistance to erosion. By examining the post-experimental bed morphology, the slope-cutting amounts and topographic reliefs are determined to positively correlate with longitudinal transition angles. These high topographic reliefs may indicate the propensity of triangular slab erosion, rather than strip-shaped slab erosion, in non-uniform channels with relatively steep erodible beds. Empirical formulas are obtained that denote the relationships among bed sediment strength, channel curvature radius, and sediment porosity through a multi-parameter regression analysis. This study may aid in clarifying the complex coupling effects of spatial variations in debris flow dynamics as well as sediment erodibility and bed morphology in non-uniform channels with abundant seismic loose material. |
| 资助项目 | National Natural Science Foundation of China[41371039] ; National Key Research and Development Plan[2018YFC1504703] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000618608300001 |
| 出版者 | SPRINGER HEIDELBERG |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Plan |
| 源URL | [http://ir.imde.ac.cn/handle/131551/55968]  |
| 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 | Wang, Jiading |
| 作者单位 | 1.Minist Water Conservancy & Power, Chengdu 610041, Sichuan, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China 3.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China 4.Northwest Univ, State Key Lab Continental Dynam, Dept Geol, Xian 710069, Shaanxi, Peoples R China 5.Sichuan Tianshengyuan Environm Serv Co Ltd, Chengdu 610032, Sichuan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Pu,Wang, Jiading,Hu, Kaiheng,et al. Effects of bed longitudinal inflexion and sediment porosity on basal entrainment mechanism: insights from laboratory debris flows[J]. LANDSLIDES,2021:22. |
| APA | Li, Pu,Wang, Jiading,Hu, Kaiheng,&Shen, Fei.(2021).Effects of bed longitudinal inflexion and sediment porosity on basal entrainment mechanism: insights from laboratory debris flows.LANDSLIDES,22. |
| MLA | Li, Pu,et al."Effects of bed longitudinal inflexion and sediment porosity on basal entrainment mechanism: insights from laboratory debris flows".LANDSLIDES (2021):22. |
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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