Investigating the effects of clay/sand content on depositional mechanisms of submarine debris flows through physical and numerical modeling
文献类型：期刊论文
| 作者 | Liu, Dingzhu4,5 ; Cui, Yifei1; Guo, Jian6; Yu, Zhilin2; Chan, Dave3; Lei, Mingyu4,5
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| 刊名 | LANDSLIDES
 |
| 出版日期 | 2020-08-01 |
| 卷号 | 17期号:8页码:1863-1880 |
| 关键词 | Submarine debris flow Rheology Flume model Computational fluid dynamics Herschel-Bulkley model |
| ISSN号 | 1612-510X |
| DOI | 10.1007/s10346-020-01387-6 |
| 产权排序 | 1 |
| 通讯作者 | Cui, Yifei(yifeicui@mail.tsinghua.edu.cn) |
| 文献子类 | Article |
| 英文摘要 | In this study, we carried out a series of physical experiments using a submersed flume model to investigate how sand/clay content influences the depositional mechanism of submarine debris flows. A three-dimensional biphasic numerical model, with a Herschel-Bulkley rheology, was used to back-analyze the physical experiments. The calibrated numerical model was then used in a back-calculation to investigate the effects of viscosity on the deposition process. The results show that as submarine debris flows mix with water during the deposition process, shear stress at the slurry-water interface generates a vortex that leads to a swirl-wedge front head. High-viscosity slurry flows with a swirl-wedge front head travel at a higher aspect ratio and with a greater radius of rotation. Hydroplaning was observed when the front head was lifted by water during flow. The lifting height increased with flow depth fluctuation. Higher viscosity slurry was found to lift more rapidly due to its larger vortex and the decrease in density at the front head over time, both of which promote fluctuation. Although a high-density slurry has a greater lifting height, the ratio of lifting height to front head height is lower, indicating a smaller lifting force influence. Lower density flows have higher kinetic energy as the transfer of potential energy into kinetic energy is more efficient. Kinetic energy dissipation comprises three stages: (1) gravity-dominated coherent flow and hydroplaning lead to a rapid increase in kinetic energy; (2) sharp reduction in kinetic energy as slurry mixes with water, coherence and hydroplaning are reduced, and the influence of the shear stress increases; (3) slurry mixed very well with water, turbidity current dominates the kinetic energy dissipation. High-density slurry dissipates quicker in the last two stages. In stage 3, which dominates the temporal evolution of the debris flow, the Froude number is lower than 1, the flow thins and elongates, and the deposition process of submarine debris flows is dominated by gravity, and the difference of morphology of the different cases become clear. |
| 电子版国际标准刊号 | 1612-5118 |
| WOS关键词 | DYNAMICS ; LANDSLIDES ; PIPELINES ; SEDIMENT ; SLIDES ; IMPACT ; CLAY |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000551224300008 |
| 出版者 | SPRINGER HEIDELBERG |
| 源URL | [http://ir.imde.ac.cn/handle/131551/35270]  |
| 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 | Cui, Yifei |
| 作者单位 | 1.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China; 2.Southwest Elect Power Design Inst, Chengdu 610021, Peoples R China; 3.Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2W2, Canada 4.Univ Chinese Acad Sci, Beijing, Peoples R China; 5.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu, Peoples R China; 6.Changan Univ, Dept Geol Engn, Xian 710054, Shaanxi, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Liu, Dingzhu,Cui, Yifei,Guo, Jian,et al. Investigating the effects of clay/sand content on depositional mechanisms of submarine debris flows through physical and numerical modeling[J]. LANDSLIDES,2020,17(8):1863-1880. |
| APA | Liu, Dingzhu,Cui, Yifei,Guo, Jian,Yu, Zhilin,Chan, Dave,&Lei, Mingyu.(2020).Investigating the effects of clay/sand content on depositional mechanisms of submarine debris flows through physical and numerical modeling.LANDSLIDES,17(8),1863-1880. |
| MLA | Liu, Dingzhu,et al."Investigating the effects of clay/sand content on depositional mechanisms of submarine debris flows through physical and numerical modeling".LANDSLIDES 17.8(2020):1863-1880. |
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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