Waves of bubbles in basaltic magmas and lavas
Waves of bubbles in basaltic magmas and lavas
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DOI：
10.1029/96jb01504
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发表时间：
1996-08-10
影响因子：
3.9
通讯作者：
Manga, M
中科院分区：
文献类型：
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作者：
Manga, M
玄武岩岩浆和熔岩流中最初均匀的气泡悬浮物可能变得不稳定，形成上升的波浪或气泡层。我们推导了两相（气泡-液体）系统的模态方程，并给出了线性稳定性分析和数值模拟结果。在哥伦比亚河水流中保存了周期囊泡层，其间距约为1 m；稳定性分析的预测结合熔岩凝固的简单模型表明，囊泡层可能代表流动中形成的气泡波。层间距是由气泡生长和水动力自扩散之间的平衡决定的。因此，保存在哥伦比亚河水流中的水泡层可能是通过流体动力学过程形成的，不需要反复注入富含挥发物的新鲜岩浆或周期性的气泡成核。气泡波也可能在岩浆房和管道中形成，并可能在喷发动力学中起作用。
Initially homogeneous suspensions of bubbles in basaltic magmas and lava flows may become unstable and form rising waves or layers of bubbles. We derive a set of modal equations for the two-phase (bubble-liquid) system and present the results of a linear stability analysis and numerical simulations. Periodic vesicle layers are preserved in Columbia River flows with a spacing of similar to 1 m; the prediction of the stability analysis combined with a simple model for solidification of the lava suggests that vesicle layers may represent waves of bubbles formed within the flow. The spacing of layers is determined by a balance between the growth of bubbles and hydrodynamic self-diffusion. Vesicular layers preserved in Columbia River flows may thus form by hydrodynamic processes and do not require the repeated injection of fresh volatile-rich magma or a periodic nucleation of bubbles. Waves of bubbles may also develop in magma chambers and conduits and could play a role in eruption dynamics.