Evaluating the controls of hillslope morphology on nonlocal sediment transport: analytical and experimental approaches

评估山坡形态对非局部沉积物迁移的控制：分析和实验方法

• 批准号: 1625311
• 负责人: Danica Roth
• 金额: $ 17.4万
• 依托单位: Roth Danica
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1625311&HistoricalAwards=false
• 关键词: Evaluating; controls; hillslope; morphology; nonlocal

Dr. Danica Roth has been granted an NSF EAR Postdoctoral Fellowship to carry out research and education plans at the University of Oregon and Vanderbilt University. The primary objective of this study is to establish and enhance the applicability of the nonlocal sediment transport numerical model in real landscapes. Nonlocal sediment transport processes include bioturbation by tree throw and burrowing animals, and fire-induced ravel. The project is composed of several distinct but complementary modules with a range of experimental, field- and data-driven components, and it naturally lends itself to outreach, education and mentorship at the K-12 and undergraduate-level. Dr. Roth will establish a new chapter of the NSF-funded Institute for Science and Engineer Educators' Professional Development Program at the University of Oregon, which will provide graduate students and postdocs with training in equitable, inquiry-based pedagogy. This program will be a venue to design a new field-based inquiry activity utilizing data from this study. The activity will be taught in the Hillslope Geomorphology class at the University of Oregon and made publicly available in online educational archives. The social relevance of topics encompassed by this project (e.g., erosional responses to fires and clear cutting) will also generate public interest and provide opportunities to increase awareness of these issues through public lectures, popular press pieces, and educational content published on YouTube and our web pages.This project will bridge the gap between the well-developed theoretical work on nonlocal transport and the need for field-based measurements and applications of nonlocal transport. This study will also generate valuable datasets on particle transport distances in a wide range of natural field settings. The nonlocal transport model will address one of the major weaknesses of existing models by taking into account roughness. The effects of roughness will be incorporated into the nonlocal formulation for particle disentrainment via its influence on critical slope and the probabilistic spacing of roughness elements. A modified PØclet number for the relative importance of local and nonlocal transport processes will be developed and field-tested in a range of natural settings. All analyses and theory will be informed and tested with field experiments to compare theoretical and measured particle travel distances and erosion rates in the Oregon Coast Range and the Painted Hills badlands in Central Oregon.

Danica Roth博士已获得NSF博士后奖学金，在俄勒冈州大学和范德比尔特大学开展研究和教育计划。本研究的主要目的是建立和提高非局部输沙数学模型在真实的景观中的适用性。非局部输沙过程包括树木投掷和穴居动物的生物扰动，以及火灾引起的解体。该项目由几个不同但互补的模块组成，具有一系列实验，实地和数据驱动的组件，它自然适合K-12和本科生一级的推广，教育和辅导。罗斯博士将在俄勒冈州大学建立一个由NSF资助的科学和工程师教育工作者专业发展计划研究所的新篇章，该计划将为研究生和博士后提供公平的、基于探究的教学法培训。该计划将是一个场地，设计一个新的实地调查活动，利用本研究的数据。该活动将在俄勒冈州大学的山坡地貌学课程中教授，并在在线教育档案中公开。本项目所涵盖主题的社会相关性（例如，对火灾和皆伐的侵蚀反应）也将引起公众的兴趣，并提供机会，通过公开讲座，流行的新闻报道，并在YouTube和我们的网页上发布的教育内容，以提高对这些问题的认识。这个项目将弥合非本地传输的成熟理论工作和基于实地的测量和应用的非本地传输的需要之间的差距。这项研究还将产生有价值的数据集的粒子传输距离在广泛的自然领域的设置。非本地运输模型将通过考虑粗糙度来解决现有模型的主要弱点之一。粗糙度的影响将被纳入非局部配方颗粒退卷通过其对临界坡度和粗糙度元素的概率间距的影响。一个修改后的本地和非本地的运输过程的相对重要性的Pappallet数将开发和实地测试在一系列的自然环境。所有的分析和理论都将通过实地实验进行验证，以比较俄勒冈州海岸山脉和俄勒冈州中部的彩绘山荒地的理论和测量颗粒传播距离和侵蚀速率。