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

9707064 Sakimoto熔岩流，存在于所有类地行星上，是行星热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就位参数（如渗出率和流速）。渠化或平整的熔岩流（在就位期间仅在边缘凝固的流）具有相对简单的几何形状，因此已成为许多试图将喷发和就位条件与最终流动尺寸联系起来的数值模型的主题。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，没有现有的模型能准确地描述河道化熔岩流的所有方面。相比之下，计算流体动力学（CFD）模拟的目的是处理复杂的流体，如熔岩。通过将熔岩流的CFD模拟结果与聚乙二醇蜡模拟熔岩的模拟实验结果相结合，将生成一个将渠化流的就位动力学与最终熔岩流形态联系起来的新模型。一旦CFD模拟被证明可以准确地再现和预测模拟熔岩流的行为，它将在有充分记录的1984年夏威夷莫纳罗亚火山流上进行测试。

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.