SGER: Exploring Vulcanian Explosions and Sedimentation Patterns Leading to Pyroclastic Density Currents Using Scaled Laboratory Experiments and Particle Image Velocimetry (PIV):

SGER：使用规模化实验室实验和粒子图像测速 (PIV) 探索火神爆炸和导致火山碎屑密度流的沉积模式：

• 批准号: 0541925
• 负责人: Amanda Clarke
• 金额: $ 3.5万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0541925&HistoricalAwards=false
• 关键词: SGER; Exploring; Vulcanian; Explosions; Sedimentation

This Small Grant for Exploratory research seeks to characterize and quantify the effects of particle size and source momentum and buoyancy fluxes on the overall behavior of jets, plumes and pyroclastic density currents (PDC) generated by highly-unsteady, short duration sources (order 10 s). As part of this study, the PI will be undergoing feasibility experiments that use particle image velocimetry (PIV) that record jet, plume and PDC front velocities as functions of time and space. The long-term goals of this project are to document and understand how spatial variations of particle concentration and settling rate, in conjunction with source unsteadiness, relate to overall jet, plume and PDC development. As part of this exploratory period, they will first test and demonstrate efficient and appropriate means of measuring these parameters. If successful, this approach will be central to making a full assessment of Vulcanian eruption dynamics.This research will support an international collaborative effort between the PI and J. C. Phillips from the University of Bristol, in the UK, and will allow a transfer of technology in the field of experimental volcanological fluid dynamics. The proposed work will implement experimental and data-acquisition methods intended for study of particle-laden flows with potential application to many other settings and environments beyond this volcanological application. Techniques such as high-speed video analysis for velocity and concentration measurements as well as Particle Image Velocimetry (PIV) will make the lab useful to the broader Arizona State University Earth and Space Sciences community, including planetary scientists interested in sediment transport on Mars.

这项用于探索性研究的小赠款旨在表征和量化粒径，源动量和浮力通量对由高度不稳定，短持续时间源产生的喷气机，羽流和火山碎屑密度电流（PDC）的总体行为的影响（pdc）。作为这项研究的一部分，PI将进行可行性实验，这些实验使用粒子图像速度计（PIV）记录JET，PLUME和PDC前速度作为时间和空间的功能。该项目的长期目标是记录并了解粒子浓度和沉降速率的空间变化以及与源不稳定的结合，与整体喷射，羽流和PDC开发有关。作为此探索期的一部分，他们将首先测试并证明测量这些参数的有效且适当的方法。如果成功，这种方法将是对Vulcanian喷发动态进行全面评估的核心。这项研究将支持英国布里斯托尔大学Pi和J. C. Phillips之间的国际合作努力，并将允许在实验火山动力学领域转移技术。拟议的工作将实施用于研究颗粒流量的实验和数据采购方法，并潜在地应用于此火山学应用以外的许多其他环境和环境。诸如用于速度和浓度测量值的高速视频分析以及粒子图像速度法（PIV）等技术将使实验室对更广泛的亚利桑那州立大学地球和太空科学社区有用，包括对火星上对沉积物感兴趣的星球科学家。