Collaborative Research: Quantifying the Fluid Dynamic Processes Controlling Channelized Lava Flow Emplacement Through Numerical, Experimental, and Field Analyses

合作研究：通过数值、实验和现场分析量化控制通道化熔岩流就位的流体动力学过程

• 批准号: 9706822
• 负责人: Tracy Gregg
• 金额: $ 5.47万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 1998-10-07
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706822&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantifying; Fluid; Dynamic

9706822 Gregg Lava flows, present on all terrestrial planets, are the surface expression of the thermal and chemical evolution of a planet. However, because an active extraterrestrial lava flow has yet to be observed, emplacement parameters (such as effusion rate and flow velocity) must be inferred from the final flow morphology. Channelized, or leveed, lava flows (flows that solidify only at their margins during emplacement) have relatively simple geometries, and thus have been the subject of many numerical models attempting to relate eruption and emplacement conditions to final flow dimensions. However, lava is a complex fluid with temperature- and strain-rate-dependent behavior, and no extant model accurately describes all aspects of the emplacement of channelized lava flows. In contrast, computational fluid dynamic (CFD) simulations are designed to treat complicated fluids such as lava. By combining CFD simulations of lava flows with results from analog experiments using polyethelyne glycol wax to simulate lava, a new model will be generated that relates the emplacement dynamics of channelized flows with the morphology of the final lava flow form. Once the CFD simulation is shown to accurately reproduce and predict the behavior of simulated lava flows, it will be tested on the well-documented 1984 Mauna Loa, Hawaii flow.

9706822格雷格熔岩流，存在于所有类地行星上，是行星热和化学演化的表面表现。 然而，由于尚未观察到活跃的地外熔岩流，因此必须从最终的流动形态推断出侵位参数（如渗出率和流速）。 熔岩流（在就位期间仅在其边缘固化的流动）具有相对简单的几何形状，因此一直是许多试图将喷发和就位条件与最终流动尺寸相关联的数值模型的主题。 然而，熔岩是一种复杂的流体与温度和应变率依赖的行为，并没有现存的模型准确地描述了渠道化熔岩流的侵位的各个方面。 相比之下，计算流体动力学（CFD）模拟旨在处理复杂的流体，如熔岩。 通过将熔岩流的CFD模拟与使用聚乙二醇蜡模拟熔岩的模拟实验结果相结合，将生成一个新的模型，该模型将通道化流的就位动力学与最终熔岩流形式的形态相关联。 一旦计算流体力学模拟被证明可以准确地再现和预测模拟熔岩流的行为，它将在1984年有充分记录的夏威夷莫纳罗亚火山流上进行测试。