Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL084776 |
The Entrainment Rate of Non-Boussinesq Hazardous Geophysical Gas-Particle Flows: An Experimental Model With Application to Pyroclastic Density Currents | |
Dellino, P.1; Dioguardi, F.2; Doronzo, D. M.3; Mele, D.1 | |
2019-11-20 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:22页码:12851-12861 |
文章类型 | Article |
语种 | 英语 |
国家 | Italy; Scotland; Spain |
英文摘要 | The entrainment rate of pyroclastic density currents is investigated by large-scale experiments. The ground flows are initiated by the impact on the terrain of a dense gas-particle fountain issuing from a cylindrical conduit, similarly to natural volcanic events. On impact, the excess density with respect to the surrounding atmosphere was up to 11.6 kg/m(3), making the currents non-Boussinesq. A power law model of the entrainment rate is developed, which is similar to that proposed for snow avalanches by Ancey (2004, ) and is verified for the Richardson's number range between 0.25 and 5.95. Rapid changes of the entrainment are caused by (i) strong accelerations at the fountain impact on the ground; (ii) break in slope; and (iii) topographic obstacles. Such changes, together with the sedimentation rate, influence flow mobility. The use of the power law is suggested for modeling the motion of unsteady hazardous geophysical mass flows such as pyroclastic density currents and snow avalanches. |
英文关键词 | Pyroclastic density currents Snow avalanches Entrainment rate |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000497263500001 |
WOS关键词 | GRAVITATIONAL CONVECTION ; TURBULENT ENTRAINMENT ; SIMULATION ; DYNAMICS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/225059 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Univ Bari, Dipartimento Sci Terra & Geoambientali, Bari, Italy; 2.British Geol Survey, Lyell Ctr, Edinburgh, Midlothian, Scotland; 3.CSIC, Inst Earth Sci Jaume Almera, ICTJA, Grp Volcanol,SIMGEO,UB, Barcelona, Spain |
推荐引用方式 GB/T 7714 | Dellino, P.,Dioguardi, F.,Doronzo, D. M.,et al. The Entrainment Rate of Non-Boussinesq Hazardous Geophysical Gas-Particle Flows: An Experimental Model With Application to Pyroclastic Density Currents[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(22):12851-12861. |
APA | Dellino, P.,Dioguardi, F.,Doronzo, D. M.,&Mele, D..(2019).The Entrainment Rate of Non-Boussinesq Hazardous Geophysical Gas-Particle Flows: An Experimental Model With Application to Pyroclastic Density Currents.GEOPHYSICAL RESEARCH LETTERS,46(22),12851-12861. |
MLA | Dellino, P.,et al."The Entrainment Rate of Non-Boussinesq Hazardous Geophysical Gas-Particle Flows: An Experimental Model With Application to Pyroclastic Density Currents".GEOPHYSICAL RESEARCH LETTERS 46.22(2019):12851-12861. |
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