EAR-PF: Experimental study of the dynamics of frozen, cohesive river banks: bridging pore-scale properties with channel-scale dynamics.

EAR-PF:冻结、粘性河岸动力学的实验研究:将孔隙尺度特性与河道尺度动力学联系起来。

基本信息

  • 批准号:
    2053009
  • 负责人:
  • 金额:
    $ 17.4万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Fellowship Award
  • 财政年份:
    2021
  • 资助国家:
    美国
  • 起止时间:
    2021-09-01 至 2023-08-31
  • 项目状态:
    已结题

项目摘要

Dr. Kieran Dunne has been awarded an NSF EAR Postdoctoral Fellowship to study the effects of widespread thawing in the Arctic on changes in frozen riverbank erosion and on the release of greenhouse gasses and heavy metals. The work will take place under the mentorship of Dr. Michael Lamb at California Institute of Technology. Accelerating climate change in the Arctic is leading to the widespread thawing of permafrost (ice and soil that typically remains frozen throughout the year). The loss of permafrost results in weakening of riverbanks, river channel migration and speeds up the release of greenhouse gasses and heavy metals. These environmental issues combined with changes in the shape of rivers have led to the displacement of communities in the Arctic. This project seeks to characterize the ways that the composition of permafrost riverbank impacts the rate of riverbank erosion and river channel migration in the Arctic. The work includes a series of experiments to determine the properties that control erosion and river migration, contributing to a framework for improved management of river systems in polar regions and a better understanding of the global carbon cycle. The project also includes education and outreach activities that incorporate preexisting California Institute of Technology programs for high school and undergraduate students. Dr. Dunne also plans to develop and distribute online educational modules on river processes hosted on SedEdu.Huge regions of land in the Arctic through which rivers incise are comprised of permafrost. The presence of pore ice in permafrost substrates has been shown to have a profound effect on the erodibility bank material as pore ice greatly increases the yield strength of frozen soil relative to unfrozen soil. As a result, the erosion rates of permafrost soils are highly sensitive to climate-driven changes to both local hydrological and atmospheric temperature conditions. This study seeks to develop a mechanistic understanding of the effects of permafrost composition and water temperature on the erosion rate of frozen riverbanks. A suite of experiments will be performed to determine the effects of cohesive sediment on the thermomechanical and geotechnical properties of permafrost substrates that govern the rate of riverbank erosion in Arctic regions. This experimental approach will be coupled with analysis of high-resolution satellite imagery of natural, permafrost rivers in the Arctic to determine how rates of channel bank erosion and lateral migration changes throughout the year in response to the governing mechanisms explored in the lab.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.
Kieran Dunne博士被授予NSF EAR博士后奖学金,研究北极地区广泛的解冻对冻结河岸侵蚀的变化以及温室气体和重金属释放的影响。这项工作将在加州理工学院的迈克尔·兰姆博士的指导下进行。北极地区气候变化的加速正在导致永久冻土(通常全年保持冻结的冰和土壤)的广泛融化。永冻层的消失导致了河岸的弱化、河道的迁移,加速了温室气体和重金属的释放。这些环境问题,加上河流形态的变化,导致了北极社区的流离失所。该项目旨在描述永久冻土河岸的组成对北极河岸侵蚀和河道迁移速度的影响。这项工作包括一系列实验,以确定控制侵蚀和河流迁移的特性,为改善极地河流系统的管理和更好地了解全球碳循环做出贡献。该项目还包括教育和推广活动,结合了加州理工学院现有的高中和本科生课程。邓恩博士还计划在SedEdu上开发和分发关于河流过程的在线教育模块。北极地区河流流经的大片土地由永久冻土层组成。孔隙冰的存在对冻土的可蚀性有深远的影响,因为相对于非冻土,孔隙冰大大增加了冻土的屈服强度。因此,多年冻土的侵蚀速率对当地水文和大气温度条件下气候驱动的变化高度敏感。本研究旨在建立对冻土组成和水温对冻结河岸侵蚀速率影响的机制理解。将进行一系列实验,以确定粘性沉积物对控制北极地区河岸侵蚀速率的永久冻土基材的热力学和岩土力学特性的影响。这一实验方法将与北极天然永久冻土河流的高分辨率卫星图像分析相结合,以确定在实验室探索的控制机制下,全年河道河岸侵蚀和横向迁移的速率是如何变化的。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Kieran Dunne其他文献

Kieran Dunne的其他文献

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