Topographic Controls on the Generation of Elutriated Ash Clouds

地形对淘洗灰云生成的控制

• 批准号: 9316656
• 负责人: Marcus Bursik
• 金额: $ 14.7万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-15 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316656&HistoricalAwards=false
• 关键词: Topographic; Controls; Generation; Elutriated; Ash

9316656 Bursik The primary hypothesis to be tested is that the manner in which elutriated ash clouds (of which 'coignimbrite' ash clouds are a subset) are generated is strongly dependent upon the interaction of pyroclastic flows and surges with the topography surrounding a volcano. Our objectives are therefore to understand ash cloud generating mechanisms and flow and surge mechanisms especially as they are affected by topography. The proposed research will consist of detailed sedimentological measurements, laboratory experiments and theoretical modeling. Field work will consist of a novel sampling strategy applied to the 1982 deposits of El Chichon volcano, Mexico, at closely spaced sites lying along traverse that traverse that parrallel flow directions. The sampling strategy will yield quantitative data that can be used to test theoretical models of flow behavior. Laboratory experiments will be conducted in conjunction with the analysis of the field data and the development of theoretical models to provide constraints on interpretations of field data and validation theory. The proposed activity will yield increased understanding of the mechanisms through which ash clouds are elutriated from pyroclastic flows and surges.

9316656 BURSIK要测试的主要假设是，生成的烟灰云（其中“ coignimbrite”灰云为子集）的方式很大程度上取决于火山流量流的相互作用以及与周围伏cano的地形相互作用的相互作用。 因此，我们的目标是了解灰云产生机制，流量和激增机制，尤其是在受地形影响时。 拟议的研究将包括详细的沉积学测量，实验室实验和理论建模。 现场工作将包括一种新型的采样策略，该策略应用于墨西哥的El Chichon火山的1982年沉积物，沿着沿着Traververs的紧密间隔位置，该策略沿着那个偏僻的流动方向。 抽样策略将产生可用于测试流动行为理论模型的定量数据。 实验室实验将与对现场数据的分析以及理论模型的开发一起进行，以提供对现场数据和验证理论的解释的约束。 所提出的活动将增加对灰云中从火山碎屑流和潮流中消除的机制的理解。