CAREER: Mechanics of Post-Wildfire Debris Flow and Transport

职业：野火后泥石流和运输的力学

• 批准号: 2238331
• 负责人: Ingrid Tomac
• 金额: $ 63.47万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2028-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2238331&HistoricalAwards=false
• 关键词: CAREER; Mechanics; Post; Wildfire; Debris

This Faculty Early Career Development (CAREER) award addresses devastating impacts of post-wildfire debris flows on civil infrastructure. Climate change has led to an increase in wildfires, posing multi-hazard threats to communities and natural environments. After wildfires, soil on burned scars becomes water repellent, which causes rainwater runoff to rush down hills and erode soil, carrying heavy boulders and debris. There is an urgent need to evaluate post-wildfire debris flow and transport to protect communities’ welfare and prosperity, and natural resources in California and the United States. This award aims to develop novel methodologies and models of debris flow impact forces that will lead to better design and retrofit strategies for impacted civil infrastructure. The project supports the education of underrepresented high-school, undergraduate, and graduate students and motivates them to pursue interdisciplinary and STEM topics. This project connects stakeholders, such as soil scientists at the California Geological Survey (CGS) and Burned Area Emergency Response (BAER), eager to update their one-dimensional risk assessment models with the latest research findings. While students on this project spend time with CGS engineers and communicate with BAER teams, they have an opportunity to collect field reconnaissance data on post-wildfire mudflows location, local soil properties, weather, and infrastructure damage in quantitative forms, as well as thoughts, recommendations, and concerns from experts. Results from this project will significantly improve the safety of communities below burned scars, as well as the resilience of civil infrastructure against natural hazards.This project includes an integrated research and education plan that establishes urgently and critically needed procedures for assessing post-wildfire debris flow effects on communities through a fundamental, across-scale micro-to-macro evaluation of post-wildfire debris flow, transport, and impacts on civil infrastructure and buildings using coupled Discrete Element Model and Material Point Method. Novel physics-based rheology of water-air-particle mixes is integrated into general correlations between mudflow downhill velocity and significant changes in mixture composition related to various initial conditions. Impacts on civil infrastructure will be assessed and categorized to develop systematic approaches to mitigation strategies, structure strengthening, new design codes, and early warning systems. Research outcomes will secure resilient civil structures facing adverse climate change in high-risk wildfire areas.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该学院早期职业发展（职业）奖旨在解决野火后泥石流对民用基础设施的破坏性影响。气候变化导致野火增加，对社区和自然环境造成多种危害。变得防水，导致雨水径流冲下山丘并侵蚀土壤，携带沉重的巨石和碎片。迫切需要评估野火后的泥石流和运输，以保护社区的福利和繁荣以及自然资源。该奖项旨在开发泥石流冲击力的新颖方法和模型，从而为受影响的民用基础设施提供更好的设计和改造策略。该项目支持代表性不足的高中、本科生和研究生的教育。该项目将利益相关者联系起来，例如加州地质调查局 (CGS) 和烧毁地区应急响应中心 (BAER) 的土壤科学家，他们渴望用最新的知识更新他们的一维风险评估模型。同时学生的研究结果。在这个项目中，我们花时间与 CGS 工程师并与 BAER 团队进行交流，他们有机会以定量形式收集有关野火后泥石流位置、当地土壤特性、天气和基础设施损坏的现场勘察数据，以及想法、建议、该项目的结果将显着改善烧伤疤痕以下社区的安全，以及民用基础设施抵御自然灾害的能力。该项目包括一项综合研究和教育计划，该计划建立了迫切需要的评估程序。野火后泥石流通过使用耦合离散元模型和基于新型物理的水流变学方法，对野火后泥石流、运输以及对民用基础设施和建筑物的影响进行基本的、跨尺度的微观到宏观评估，以评估对社区的影响。空气-颗粒混合物被纳入泥浆流下坡速度和与各种初始条件相关的混合物成分的显着变化之间的一般相关性中。预警研究成果将确保高风险野火地区具有抵御不利气候变化的弹性土木结构。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。