Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL075759 |
Enhanced Mobility in Concentrated Pyroclastic Density Currents: An Examination of a Self-Fluidization Mechanism | |
Breard, Eric C. P.1; Dufek, Josef1; Lube, Gert2 | |
2018-01-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:2页码:654-664 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; New Zealand |
英文摘要 | Pyroclastic density currents (PDCs) are a significant volcanic hazard. However, their dominant transport mechanisms remain poorly understood, in part because of the large variability of PDC types and deposits. Here we combine field data with experimental and numerical simulations to illuminate the twofold fate of particles settling from an ash cloud to form the dense PDC basal flow. At solid fractions >1 vol %, heterogeneous drag leads to formation of mesoscale particle clusters that favor rapid particle settling and result in a mobile dense layer with significant bed weight support. Conversely, at lower concentrations the absence of particle clusters typically leads to formation of poorly mobile dense beds that deposit massive layers. Based on this transport dichotomy, we present a numerical dense-dilute parameter that allows a PDC's dominant transport mechanism to be determined directly from the deposit geometry and grainsize characteristics. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425514300020 |
WOS关键词 | SOUFRIERE HILLS VOLCANO ; LONG-RUNOUT LANDSLIDES ; MFIX-DEM SOFTWARE ; MOUNT ST-HELENS ; TAUPO ERUPTION ; NEW-ZEALAND ; FLOWS ; SURGES ; IGNIMBRITE ; EMPLACEMENT |
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/29122 |
专题 | 气候变化 |
作者单位 | 1.Georgia Inst Technol, Earth & Atmospher Sci, Atlanta, GA 30332 USA; 2.Massey Univ, Inst Agr & Environm, Volcan Risk Solut, Palmerston North, New Zealand |
推荐引用方式 GB/T 7714 | Breard, Eric C. P.,Dufek, Josef,Lube, Gert. Enhanced Mobility in Concentrated Pyroclastic Density Currents: An Examination of a Self-Fluidization Mechanism[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(2):654-664. |
APA | Breard, Eric C. P.,Dufek, Josef,&Lube, Gert.(2018).Enhanced Mobility in Concentrated Pyroclastic Density Currents: An Examination of a Self-Fluidization Mechanism.GEOPHYSICAL RESEARCH LETTERS,45(2),654-664. |
MLA | Breard, Eric C. P.,et al."Enhanced Mobility in Concentrated Pyroclastic Density Currents: An Examination of a Self-Fluidization Mechanism".GEOPHYSICAL RESEARCH LETTERS 45.2(2018):654-664. |
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