Thermal and Rheological Controls on the Emplacement of Basaltic Lava Flows

热和流变控制的玄武熔岩流的安置-0207919 PI：现金男Kauahikaua这是一个更新的建议，直接遵循的主题和方法，以先前的奖项。& 最近对夏威夷活跃的pahoehoe流和'a' a流的研究，包括PI的研究，表明流动形态和就位之间的明确联系涉及冷却、结晶和流动推进的相对速率。关键是熔岩从喷口到流动前沿的运输条件。流动表面形态的现场观察导致晶体液体悬浮液中屈服强度发展的流变学研究。使用PEG蜡的新实验表明，在均匀的通道化流动中的固化可以通过单个无量纲参数和通道纵横比来描述。不均匀性，如水道发散、收缩和弯曲，也可能稳定或破坏地壳表面。上一个奖项的结果说明了这些方法的成功。目前的合同将使用高分辨率卫星遥感来绘制玄武岩流图，完成额外的模拟实验，以更好地确定重要的物质参数和流动控制，并将模型预测与详细的流动现场观测进行比较。 这一更新奖继续支持现金男（俄勒冈州大学），考阿希卡瓦（美国，夏威夷火山天文台）和格里菲斯克尔（澳大利亚国立大学）。& 该研究团队汇集了夏威夷熔岩流的实地测绘和解释方面的专业知识，以及凝固流的流体力学分析方面的专业知识。

Thermal and Rheological Controls on the Emplacement of Basaltic Lava FlowsEAR-0207919PIs: Cashman & KauahikauaThis is a renewal proposal that follows directly in theme and approach to the previous award. Recent studies of active pahoehoe and `a`a flows in Hawai`i, including those by the PIs, have shown that the explicit link between flow morphology and emplacement involves the relative rates of cooling, crystallization, and flow advance. Critical are conditions of lava transport from the vent to the flow front. Field observations of flow surface morphologies have led to rheological studies on yield strength development in crystal-liquid suspensions. Novel experiments using PEG wax suggest that solidification in uniform channelized flows may be described by a single dimensionless parameter and channel aspect ratio. Non-uniformities such as channel divergences, constrictions, and sinuosity also may stabilize or disrupt surface crust. Results from the previous award illustrate the success of these approaches. The current award will use high resolution satellite remote sensing to map basaltic flows, complete additional analog experiments to better define important material parameters and flow controls, and compare model predictions with detailed field observations of flows. This renewal award continues support for the collaboration between Cashman (Univ. of Oregon), Kauahikaua (U.S.G.S., Hawaiian Volcano Observatory), and Griffiths & Kerr (Australian National University). The research team brings together expertise on the field mapping and interpretation of Hawaiian lava flows and expertise on fluid mechanical analysis of solidifying flows.