CAREER: Interpreting dune-field evolution from aeolian bedform patterns

职业：从风成床形态模式解释沙丘场的演变

• 批准号: 2042181
• 负责人: Mackenzie Day
• 金额: $ 53.33万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2042181&HistoricalAwards=false
• 关键词: CAREER; Interpreting; dune; field; evolution

Dune fields cover more than 2.3 million square miles on Earth. Blowing sand and migrating dunes disrupt agriculture and transport, causing economic and logistical problems for local populations. The behavior of individual dunes is well-studied, but understanding and predicting how whole dune-fields migrate remains a complex and unsolved problem. In this work, the research team will study the large-scale patterns that arise in dune fields, and then use those patterns to develop a numerical model of dune migration. Measurements from three dune fields in the southwestern United States and dune fields created experimentally in a wind tunnel will inform the development of the numerical model. This strategy has been successfully applied in other systems, and will improve scientists’ ability to predict and mitigate dune encroachment near populated areas. As part of this work, the team will also develop a library of virtual field trips that can be experienced using commercial virtual reality headsets. These publicly available virtual field trips will leverage improvements in virtual technology to enhance the quality and accessibility of geoscience education. This project is co-funded by the Geomorphology and Land-use Dynamics and the EAR Education and Human Resources Programs.To study dune field migration through the lens of dune patterns, this research will take advantage of the strengths of field, modeling, experimental, and remote sensing methods. The three dune fields will be monitored using high-frequency measurements collected by meteorological stations and precise spatial measurements of dune position. Wind tunnel experiments will also be conducted to test how dune patterns can be influenced in controlled experimental settings. Measurements from both dunes in nature and wind tunnel experiments will be integrated into an open-source model of dune-field development to set the timescales and length scales in the simulation. The virtual field trips developed to improve geoscience education will be captured using 360 degree stereo video cameras. Overall this work will answer fundamental questions about dunes and improve geoscience education.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.

沙丘覆盖地球上超过230万平方英里。风沙和流动的沙丘扰乱了农业和运输，给当地居民带来了经济和后勤问题。单个沙丘的行为已经得到了很好的研究，但是理解和预测整个沙丘如何迁移仍然是一个复杂而未解决的问题。在这项工作中，研究小组将研究沙丘领域出现的大规模模式，然后使用这些模式来开发沙丘迁移的数值模型。在美国西南部的三个沙丘场和在风洞中实验性地创建的沙丘场的测量将为数值模型的开发提供信息。这一战略已成功地应用于其他系统，并将提高科学家预测和减轻人口稠密地区附近沙丘侵蚀的能力。作为这项工作的一部分，该团队还将开发一个虚拟实地考察的图书馆，可以使用商业虚拟现实耳机体验。这些公开的虚拟实地考察将利用虚拟技术的改进来提高地球科学教育的质量和可获得性。本研究由地貌学与土地利用动力学研究所和生态学教育与人力资源研究所共同资助，旨在通过沙丘形态的透镜研究沙丘迁移，本研究将利用野外、模拟、实验和遥感方法的优势。将利用气象站收集的高频测量数据和沙丘位置的精确空间测量数据对这三个沙丘区进行监测。还将进行风洞实验，以测试在受控实验环境中如何影响沙丘格局。来自自然界沙丘和风洞实验的测量结果将被整合到一个沙丘开发的开源模型中，以设定模拟中的时间尺度和长度尺度。为改善地球科学教育而开发的虚拟实地考察将使用360度立体摄像机拍摄。总的来说，这项工作将回答有关沙丘的基本问题，并改善地球科学教育。这个奖项反映了NSF的法定使命，并已被认为是值得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的支持。