DOI: 10.1016/j.epsl.2020.116504
论文题名: The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments
作者: Soldati A. ; Farrell J.A. ; Sant C. ; Wysocki R. ; Karson J.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 548 语种: 英语
中文关键词: basaltic lava flows
; bubbles
; large-scale experiments
; two-phase rheology
英文关键词: Basalt
; Elasticity
; Velocity measurement
; Basaltic lava flow
; Bulk viscosity
; Lava flows
; Particle image velocimetries
; Relative viscosity
; Runout distances
; Sheetflows
; Syracuse University
; Viscosity
; basalt
; bubble
; emplacement
; experimental study
; lava flow
; multiphase flow
; rheology
; viscosity
英文摘要: Bubbles are known to have a dramatic effect on lava rheology, but their impact on lava flow run out distance has not been extensively investigated. To quantify bubble effects on basaltic lava flow emplacement, we conducted a series of large-scale two-phase (melt+bubbles) experiments at the Syracuse University Lava Project facility. In this study, nine basaltic lava flows with low to intermediate vesicle contents (approximately 3-24 vol%) were emplaced over gently sloping (4°-9°) dry sand surfaces. Their velocities were measured by particle image velocimetry, and their bulk viscosities were calculated using Jeffreys' equation. Comparison with melt-only viscosities (calculated through the GRD model) allowed the isolation of the effect of bubbles on the viscosity of the experimental flows. We find that within the investigated range of vesicularities, bubbles increase the relative viscosity of the experimental flows by up to an order of magnitude. The increase appears to be steeper for sheet flows than for lobate and toey flows. Our results, which quantitatively assess the effect of bubbles on the rheology of basaltic lava flows, will provide a basis for the refinement of models for multi-phase flows that are fundamental to accurately forecasting the emplacement of lava flows. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165274
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany; Department of Earth Sciences, Syracuse University, Syracuse, NY 13244, United States; School of Art, Syracuse University, Syracuse, NY 13244, United States
Recommended Citation:
Soldati A.,Farrell J.A.,Sant C.,et al. The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments[J]. Earth and Planetary Science Letters,2020-01-01,548