Modeling Magma Dynamics and Degassing in Volcanic Eruptions

模拟火山喷发中的岩浆动力学和脱气

• 批准号: 0513199
• 负责人: Dork Sahagian
• 金额: $ 16.29万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-10-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0513199&HistoricalAwards=false
• 关键词: Modeling; Magma; Dynamics; Degassing; Volcanic

MODELING MAGMA DYNAMICS AND DEGASSING IN VOLCANIC ERUPTIONS EAR-0207821PIs: Proussevitch & SahagianThe primary goal of this project is to develop a mathematical analysis and computer model of the movement of magma within volcanoes. Eruptions are normally driven by the growth of gas bubbles that come out of solution in the magma due to reductions in pressure before and during magma ascent within the volcano. The project consists of two parts. The first is a mathematical and computer analysis of volcanic eruption processes. The second is a sensitivity analysis to determine how the model system responds to variations in each of a number of attributes of the volcanic system. This should elucidate the roles and relative importance of all relevant factors in driving volcanic eruptions. The numerical model will enable us to explore the interaction of magma ascent, bubble growth, bubble size distribution, temperature change, and other specific volcanic processes. The proposed model is not intended to simulate specific natural eruptions. Rather, the results of the model and sensitivity study should lead to a better understanding of the mechanisms by which bubble growth drives eruptions, and an understanding of how magmatic conditions, properties, and conduit geometry affect the style of volcanic eruptions. This will set the stage for determining the conditions under which to expect explosive volcanic eruptions and their related volcanic hazards.

模拟火山喷发中的岩浆动力学和脱气这个项目的主要目标是建立火山内岩浆运动的数学分析和计算机模型。火山爆发通常是由岩浆溶液中气泡的增长所驱动的，这些气泡是由于火山内部岩浆上升之前和上升过程中压力的减少而产生的。该项目由两部分组成。首先是火山喷发过程的数学和计算机分析。第二个是敏感性分析，以确定模型系统如何对火山系统的许多属性中的每一个属性的变化作出反应。这将阐明所有相关因素在推动火山爆发中的作用和相对重要性。数值模型将使我们能够探索岩浆上升、气泡生长、气泡大小分布、温度变化和其他特定火山过程的相互作用。所提出的模型并不打算模拟具体的自然喷发。相反，模型和敏感性研究的结果应该有助于更好地理解气泡生长驱动喷发的机制，以及岩浆条件、性质和导管几何形状如何影响火山喷发的类型。这将为确定预期爆炸性火山爆发及其相关火山危害的条件奠定基础。