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: 9707064
• 负责人: Susan E. Sakimoto
• 金额: $ 4.23万
• 依托单位: Universities Space Research Association
• 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 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9707064&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantifying; Fluid; Dynamic

9707064 Sakimoto 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.

9707064樱本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达。然而，由于尚未观察到活跃的地外熔岩流，因此必须根据最终的流动形态来推断侵位参数(如渗漏速度和流速)。沟道化的熔岩流(在侵位过程中只在边缘凝固的熔岩流)具有相对简单的几何结构，因此一直是许多数值模型的主题，这些模型试图将喷发和侵位条件与最终的流动尺寸联系起来。然而，熔岩是一种复杂的流体，具有温度和应变率相关的行为，现有的模型没有准确地描述沟道化熔岩流侵位的所有方面。相比之下，计算流体动力学(CFD)模拟是为处理熔岩等复杂流体而设计的。通过将熔岩流动的CFD模拟与聚乙二醇蜡模拟熔岩的模拟实验结果相结合，将产生一个新的模型，该模型将沟道化流动的侵位动力学与最终熔岩流动的形态联系起来。一旦CFD模拟被证明能够准确地再现和预测模拟熔岩流的行为，它将在记录良好的1984年夏威夷莫纳罗亚流上进行测试。