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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments
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The effect of bubbles on the rheology of basaltic lava flows: Insights from large-scale two-phase experiments

机译：气泡对玄武岩熔岩流变的影响：大规模两相实验的见解

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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 degrees-9 degrees) 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. (C) 2020 Elsevier B.V. All rights reserved.
机译：已知气泡对熔岩流变学具有显着影响，但它们对熔岩流量的影响越来越广泛地研究了距离。为了量化对玄武岩流量施加的泡沫影响，我们在锡拉丘兹大学熔岩项目设施中进行了一系列大规模的两相（熔体+气泡）实验。在本研究中，九个玄武岩熔岩流量低至中间囊泡含量（约3-24体积％）被施加在轻微的倾斜（4摄氏度）干燥的沙壳上。它们的速度通过颗粒图像速度测量，并且使用Jeffreys的等式计算它们的堆积粘度。与熔融粘度（通过GRD模型计算）的比较允许分离气泡对实验流动粘度的影响。我们发现在调查范围的紫刺素范围内，气泡将实验流的相对粘度增加到大量级。增加的增加对于叶片和叶片流动的陡峭。我们的结果是定量评估气泡对玄武岩流动流变的影响，将为改进模型的多相流量的基础，这是准确预测熔岩流的施加的基础。 （c）2020 Elsevier B.v.保留所有权利。

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