CAREER: Spatial Quantification of Fundamental Mechanisms that Initiate Post-Wildfire Wetting-Induced Shallow Landslides

职业：引发野火后润湿引起的浅层滑坡的基本机制的空间量化

• 批准号: 2324785
• 负责人: Idil Akin
• 金额: $ 56.71万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-10-01 至 2027-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2324785&HistoricalAwards=false
• 关键词: CAREER; Spatial; Quantification; Fundamental; Mechanisms

This Faculty Early Career Development (CAREER) award will explore how dynamic changes in a forest environment that is recovering from a wildfire control the stability of burnt hillslopes against wetting-induced shallow landslides over time. The US wildfire management strategy has changed from “fighting wildfires” to “living with wildfires,” which involves community adaptation to wildfires. Post-wildfire landslides have been identified as a serious cascading risk to community adaptation to wildfires, but the fundamental initiation mechanisms are not yet understood. There is currently no wildfire-specific approach to evaluating the landslide susceptibility of burned hillslopes. This project will be the first step toward developing a wildfire-specific framework for analyzing the stability of hillslopes as a function of time, saturation, and forest use practices for different intensity fires and different landslide mechanisms. The research will be integrated with an education program aiming to place a new generation of engineers in a position to analyze and alleviate the risk of post-wildfire landslides, inform the policy makers, and promote community education about such risks.The primary research objective of this study is to quantify the fundamental mechanisms that change mechanical and hydrologic soil behavior and therefore slope stability in post-wildfire environments. The fundamental mechanisms are hypothesized to be controlled by forest system dynamics (i.e., tree loss, regrowth, ash movement), that synergistically control suction stress. To achieve the primary research objective, the following specific objectives will be achieved: 1) quantify post-wildfire suction stress and forest system dynamics over time, 2) identify the change functions for the components of forest system dynamics in relation to suction stress, and 3) evaluate post-wildfire shallow landslide susceptibility using a probabilistic approach. This will require a multiscale investigation of soil behavior in post-wildfire environments. The research plan involves testing soil behavior from the atomic scale to the hillslope scale and will allow multi-sensor data fusion. Field and laboratory data will be combined with spatial data from LiDAR scans and aerial photographs. The spatial variability in suction stress along the hillslope will be presented as a distribution function and will be an input for a probabilistic slope stability model for evaluating the wetting-induced shallow landslide susceptibility of burned hillslopes. In addition, the dependency of the adsorptive component of suction stress on the soil water retention curve will be investigated through water vapor sorption isotherms. This will improve our understanding of the degree of physicochemical forces on mechanical soil behavior.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.

这项教师早期职业发展（职业）奖将探讨如何在森林环境中的动态变化，这种变化如何从野火控制中恢复过来的燃烧山坡的稳定性随着时间的推移而润湿引起的浅层滑坡。美国野火管理策略已从“战斗野火”变成“与野火生活”，涉及社区对野火的适应。野火后滑坡已被确定为对社区适应野火的严重级联风险，但尚未了解基本的主动机制。目前尚无针对野火特定的方法来评估烧伤的山坡的滑坡敏感性。该项目将是开发特定于野火特定框架的第一步，用于分析山坡的稳定性，这是时间，满意度和森林使用实践的函数，用于不同的强度火灾和不同的滑坡机制。这项研究将与旨在将新一代工程师置于分析和减轻野火后滑坡的风险，通知政策制定者并促进社区教育有关此类风险的基本研究目标的基本机制，从而改变机械和水文的基本机制，从而改变机械和水文稳定性的基本机制。假设基本机制是由森林系统动态（即树木损失，改革，灰烬运动）控制的，可以协同控制任务压力。为了实现主要的研究目标，将实现以下特定目标：1）随着时间的推移，量化后火后火力压力和森林系统动力学，2）确定森林系统动力学组成部分的变化功能与任务压力相关，3）评估野后火后浅水浅层易感性，使用概率方法进行。该研究计划涉及测试从原子量表到山坡量表的土壤行为，并将允许多传感器数据融合。现场数据和实验室数据将与来自激光扫描和航拍照片的空间数据相结合。沿山坡的假设应力的空间变化将作为分布函数呈现，并将成为概率斜率稳定性模型的输入，以评估燃烧的山坡的润湿引起的浅层滑坡易感性。另外，将通过水蒸气吸附等温线研究吸入应力的吸附成分对土壤保留曲线的依赖性。这将提高我们对机械土壤行为的物理力量程度的理解。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准来评估被认为是宝贵的支持。