Validation of a Numerical Granular Flow Simulation Model for Pyroclastic Flows and Debris Avalanches

火山碎屑流和泥石流数值颗粒流模拟模型的验证

• 批准号: 0408709
• 负责人: Barry Voight
• 金额: $ 27.52万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0408709&HistoricalAwards=false
• 关键词: Validation; Numerical; Granular; Flow; Simulation

Pyroclastic flows and volcanic debris avalanches are among the most hazardous volcanic events and have been responsible for tens of thousands of deaths in the 20th century. However, reliable hazards assessments are difficult to accomplish and improved modeling is a major key to improved assessments. This research will test a recently developed, very powerful, flow model code (TITAN2D) and compare its output to a unique body of field data (from select sites with very high quality data). The intellectual merit of this research is to increase our understanding of the physics of hazardous phenomena, and to aid the use of TITAN2D via its validation, calibration, and code improvements. Validation is the process of determining the degree to which a model is an accurate representation of the real world. Its focus is on physics issues, on solving the right equations for the problem at hand. With validation it is anticipated that this model could be used in a reasonably reliable way to investigate flow processes, to aid hazards and risk assessments, make hazards and risk maps, and contribute to hazards mitigation. The information intended for validation exercises include remarkably detailed data on 30 large to major dome collapses and slope failures. Broader impacts include societal benefits through improved understanding of hazardous processes, improved hazards assessments and risk communication, and more effective zoning in volcanic and slope instability crises. This research should contribute data and foster computer code enhancements by collaborating SUNY scientists that will make the method generally more effective and reliable for applications. Research results will be communicated frequently and interactively to code developers, and disseminated in timely fashion at meetings and workshops, by publications, and through the web.

火山碎屑流和火山碎屑雪崩是最危险的火山事件之一，在20世纪已造成数万人死亡。 然而，可靠的危害评估是难以实现的，改进的建模是改进评估的一个主要关键。这项研究将测试一个最近开发的，非常强大的，流动模型代码（TITAN2D），并将其输出与一个独特的现场数据（从选择的网站非常高质量的数据）。这项研究的智力价值是增加我们对危险现象物理学的理解，并通过其验证，校准和代码改进来帮助TITAN2D的使用。验证是确定模型准确表示真实的世界的程度的过程。它的重点是物理问题，解决手头问题的正确方程。通过验证，预计该模型可以以合理可靠的方式用于调查流程，帮助进行危害和风险评估，绘制危害和风险图，并有助于减轻危害。用于验证工作的信息包括30个大型到大型圆顶倒塌和边坡破坏的非常详细的数据。更广泛的影响包括通过提高对危险过程的认识、改进灾害评估和风险沟通以及在火山和斜坡不稳定危机中更有效地进行分区而产生的社会效益。这项研究应该贡献数据，并通过与SUNY科学家的合作促进计算机代码的增强，这将使该方法在应用中更加有效和可靠。研究结果将经常以互动方式传达给代码开发人员，并在会议和研讨会上、通过出版物和网络及时传播。