Topographic Controls on the Generation of Elutriated Ash Clouds

9316656 Bursik要测试的主要假设是，淘析灰云（其中“coignimbrite”灰云是一个子集）的产生方式强烈依赖于火山碎屑流和浪涌与火山周围地形的相互作用。 因此，我们的目标是了解灰云的产生机制和流动和浪涌机制，特别是当它们受到地形的影响。 拟议的研究将包括详细的沉积测量，实验室实验和理论建模。 实地工作将包括一种新的采样策略，适用于1982年墨西哥埃尔奇雄火山的沉积物，在紧密间隔的网站躺在沿着横贯parrandom流动方向。 采样策略将产生可用于测试流动行为的理论模型的定量数据。 实验室实验将结合现场数据分析和理论模型的开发进行，以提供对现场数据和验证理论的解释的限制。 拟议的活动将使人们更好地了解火山碎屑流和火山灰潮淘析火山灰云的机制。

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.