| DOI: | 10.1002/2015GL064874
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| 论文题名: | High-speed imaging of Strombolian eruptions: Gas-pyroclast dynamics in initial volcanic jets |
| 作者: | Taddeucci J.; Alatorre-Ibarguengoitia M.A.; Palladino D.M.; Scarlato P.; Camaldo C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8612
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| EISSN: | 1944-8343
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| 出版年: | 2015
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| 卷: | 42, 期:15 | | 起始页码: | 6253
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| 结束页码: | 6260
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| 语种: | 英语
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| 英文关键词: | ballistic
; deceleration
; drag
; jet
; Strombolian
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| Scopus关键词: | Ballistics
; Deceleration
; Drag
; High speed cameras
; Ionization of gases
; Jets
; Velocity
; Volcanoes
; Vortex flow
; Constant velocities
; Ejection velocity
; Gas-pyroclast mixtures
; High speed imaging
; Quantitative mapping
; Strombolian
; Time-averaged velocity
; Volcanic jets
; Fighter aircraft
; drag
; jet
; pyroclastic deposit
; stromatolite
; volcanic eruption
; vortex
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| 英文摘要: | High-speed imaging of Strombolian explosions brings into view the motion of pyroclasts upon leaving the volcanic vent. The erupted gas-pyroclast mixtures form jets with well-defined leading vortex rings that rise at almost constant velocity proportional to the time-averaged velocity of pyroclasts. The ejection velocity of pyroclasts decreases over time and defines a conical profile centered on the jet central streamline. Pyroclast deceleration patterns are related to their velocity and compatible with drag force but are also strongly controlled by jet dynamics. These patterns include constant, decreasing, or abruptly increasing decelerations up to 104 m s-2. Nonuniform deceleration focuses at the jet sides and, mostly, in a narrow zone across the vortex ring. This deceleration zone is trailed by a reduced drag zone, where deceleration is drastically reduced. In these highly transient eruptions, both zones move upward and attenuate over time. Our results provide the first quantitative mapping of reduced drag zones. ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940450775&doi=10.1002%2f2015GL064874&partnerID=40&md5=87ca3c71e14d68e3cdeaaeb60e073222
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8228
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
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| Recommended Citation: | |
Taddeucci J.,Alatorre-Ibarguengoitia M.A.,Palladino D.M.,et al. High-speed imaging of Strombolian eruptions: Gas-pyroclast dynamics in initial volcanic jets[J]. Geophysical Research Letters,2015-01-01,42(15).
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