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DOI	10.1016/j.epsl.2020.116504
	The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments
	Soldati A.; Farrell J.A.; Sant C.; Wysocki R.; Karson J.A.
发表日期	2020
ISSN	0012821X
卷号	548
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202896
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
推荐引用方式 GB/T 7714	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],2020,548.
APA	Soldati A.,Farrell J.A.,Sant C.,Wysocki R.,&Karson J.A..(2020).The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments.Earth and Planetary Science Letters,548.
MLA	Soldati A.,et al."The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments".Earth and Planetary Science Letters 548(2020).