SitS: Collaborative Research: Understand and forecast long-term variations of in-situ geophysical and geomechanical characteristics of degrading permafrost in the Arctic

SitS：合作研究：了解和预测北极退化永久冻土原位地球物理和地质力学特征的长期变化

• 批准号: 2034380
• 负责人: Dmitry Nicolsky
• 金额: $ 21.4万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2034380&HistoricalAwards=false
• 关键词: SitS; Collaborative; Research; Understand; forecast

Climate change is resulting in warming of the permafrost across the Arctic and sub-Arctic, which results in changes in the geological and mechanical properties of soils. Quantifying the changes in soil properties are critical for both understanding the natural environment and assessing the effects of these changes on the existing and future built infrastructure, both of which have long-lasting societal impacts. This project will embed fiber optic sensing cables into the ground in an Alaskan coastal community. Fiber-optic-sensed signals will be converted into the geological and geomechanical properties of the ground material and then used to quantitatively forecast future impacts on permafrost properties. The project outcomes will enable realistic evaluation of the performances of infrastructure in Arctic Alaska and improve the design of more robust infrastructure in the Arctic. The research team will actively recruit and train women scientists and engineers through convergent research, and the research team will be involved in educational and outreach activities in Utqiaġvik, Alaska’s indigenous community.The goal of this project is to understand and forecast long-term variations of in-situ geophysical and geomechanical characteristics of the active layer and permafrost in Arctic Alaska using an innovative sensing technology, data transmission and analysis, and modeling. Through advances in sensor systems and modeling, the project will transform existing capabilities for understanding dynamic, near-surface soil processes in the active layer and permafrost in an Arctic coastal community, thus generating quantitative knowledge of long-term and in-situ permafrost degradation in the Arctic due to climate change. Five tasks will be conducted: (1) develop and deploy a 1.5-kilometer-long fiber-optic distributed acoustic sensing (DAS) array in Utqiaġvik, Alaska for long-term in-situ permafrost monitoring; (2) develop innovative data transmission and analysis of DAS signals in permafrost and derive temperature-dependent S-wave and P-wave velocity profiles of changing permafrost in spatial and temporal scales; (3) obtain ground-truth measurements of geophysical and geomechanical properties through in-situ and laboratory characterizations; (4) develop correlations between geophysical and geomechanical properties of permafrost and S- and P-wave velocities as well as between permafrost temperature and S- and P-wave velocities; and (5) forecast future changes of geophysical and geomechanical properties of degrading permafrost. Research outcomes will directly inform current infrastructure evaluation and future infrastructure development in the North Slope Borough, Alaska. Methodology developed in this project will provide transformative and cost-effective geophysical and geotechnical monitoring in the Arctic and sub-Arctic regions.This award was made through the "Signals in the Soil (SitS)" solicitation, a collaborative partnership between the National Science Foundation and the United States Department of Agriculture National Institute of Food and Agriculture (USDA NIFA).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.

气候变化导致在北极和亚北极地区的多年冻土变暖，从而导致土壤的地质和机械性能变化。量化土壤特性的变化对于理解自然环境和评估这些变化对现有和未来建造的基础设施的影响至关重要，这些基础设施都具有长期的社会影响。该项目将在阿拉斯加沿海社区中将光纤传感电缆嵌入到地面上。光纤信号信号将转换为地面材料的地质和地质力学特性，然后用于定量对多年冻土特性的影响。该项目结果将实现对阿拉斯加北极基础设施的性能的现实评估，并改善北极中更健壮的基础设施的设计。研究小组将通过收敛研究积极招募和培训女性科学家和工程师，研究团队将参与阿拉斯加土著社区UTQIAġVIK的教育和外展活动。该项目的目的是理解和预测长期的长期变化，用于使用Situ geophysical and dromistiative antrask Alast Alask Alask Alask Alask Alask Arask Arask Alast andictical antict Alast，Arast artical Alast，Arast artictical and arast artict and arast artical and artical and clastical and arast，建模。通过传感器系统和建模的进步，该项目将改变现有的能力，以了解北极沿海社区中活跃层和多年冻土的动态，近地表土壤过程，从而产生对由于气候变化引起的北极中长期和原位的长期和原位永久冻土降低的知识。将实施五项任务：（1）在阿拉斯加的Utqiaġvik中开发和部署1.5公里长的纤维 - 光纤分布式声感应（DAS）阵列，以长期为原地永久冻土监测； （2）在永久冻土中开发创新的数据传输和DAS信号的分析，并得出了温度依赖性的S波和P波速度曲线的空间和临时尺度中变化多年冻土的速度； （3）通过原地和实验室特征获得地球物理和地质力学特性的基础真相测量； （4）在多年冻土，S-和P波速度的地球物理和地球力学特性以及多年冻土温度与S-和P波速度之间发展相关； （5）预测多年冻土降解的地球物理和地质力学特性的未来变化。研究成果将直接为阿拉斯加北坡行政区的当前基础设施评估和未来的基础设施发展提供信息。该项目中开发的方法将在北极和亚北极地区提供变革性和成本效益的地球物理和岩土监测。 This award was made through the "Signals in the Soil (SitS)" solicitation, a collaborative partnership between the National Science Foundation and the United States Department of Agriculture National Institute of Food and Agriculture (USDA NIFA).This award reflects NSF's statutory mission and has been deemed precious of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.