International Research Fellow Awards: Understanding of the Behavior of Pyroclastic Flow Through Experiment and Model

9704290 valance国际研究员奖励计划使美国科学家和工程师能够在国外进行三到二十四个月的研究。该计划的奖励为联合研究提供了机会，并使用独特或互补的设施、专业知识和实验条件。该奖项将支持James W. valance博士与Stuart B. Savage博士在加拿大蒙特利尔麦吉尔大学进行为期12个月的博士后研究访问。瓦兰斯博士将研究火山碎屑流的行为侧重于模拟和建模。火山碎屑流是热的、干燥的颗粒流和含有高浓度颗粒的气体流。该项目将涵盖气流的所有部分，包括热的、非流化的、部分流化的、致密的、颗粒浓度与原始沉积物相似的基底雪崩，颗粒浓度非常低的覆盖湍流火山灰云涌动，以及对流火山灰云。然而，这项研究的重点是颗粒状的基底雪崩。这些水流每年破坏财产，造成数百人死亡。该项目将结合麦吉尔大学一位在火山灾害评估和力学方面经验丰富的实地地质学家和一位在颗粒流动力学和建模方面享有国际声誉的土木工程教授的才能。＊＊＊

9704290 Vallance The International Research Fellow Awards Program enables U.S. scientists and engineers to conduct three to twenty - four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions. This award will support a twelve-month postdoctoral research visit by Dr. James W. Vallance to work with Dr. Stuart B. Savage at McGill University in Montreal, Canada. Dr. Vallance will be studying the behavior of pyroclastic flows focusing on simulation and modelling. Pyroclastic flows are hot, dry flows of particles and gas with a high concentration of particles. This project will encompass all parts of a flow, including a hot, non- to partly fluidized, dense, basal avalanche having a concentration of particles similar to that of the original deposit, an overriding turbulent ash cloud surge with a very low particle concentration, and a convecting ash cloud. The study focuses, however, on the granular basal avalanche. These flows destroy property and kill hundreds of people yearly. This project will combine the talents of a field oriented geologist, experienced in volcanic hazard assessment and mechanics, with a professor of civil engineering, internationally respected in grain-flow mechanics and modelling, at McGill. ***