RII Track-4: Using Novel Applications of Luminescence Techniques to Evaluate Channel Mobility and Bedrock Valley Development

RII Track-4：利用发光技术的新颖应用来评估河道流动性和基岩谷发育

• 批准号: 1833025
• 负责人: Abigail Langston
• 金额: $ 19.76万
• 依托单位: Kansas State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-10-01 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1833025&HistoricalAwards=false
• 关键词: RII; Track; Using; Novel; Applications

Nontechnical DescriptionBy eroding and depositing sediment, river systems record past changes in climate, hydrology, vegetation, and tectonic processes on the Earth's surface. While vertical erosion into bedrock landscapes has been extensively studied, there is little consensus on how rivers erode laterally in bedrock landscapes. It is crucial to establish the duration of lateral widening intervals that create bedrock valleys in order to understand how changes in river dynamics shape the Earth's surface. Through a collaboration with the Desert Research Institute (DRI), the PI will learn luminescence dating techniques that will allow her to establish the timing of lateral erosion intervals and apply these techniques to infer transport history of sediments. Determining the timing of past and current river incision is important for predicting the effect of ongoing landscape change on humans who live and work near rivers in Kansas, the PI's home state. The PI's home institution, Kansas State University, will benefit from the professional development of the PI, her extended collaborative network with DRI, and the incorporation of dating techniques in research and teaching to demonstrate how local rivers change on decadal and centennial time scales that humans must be prepared to adapt to.Technical DescriptionThe processes that control vertical incision in bedrock rivers are widely studied and well characterized; however, the fundamental processes that control lateral erosion have not been quantified in the laboratory or in the field. Field data that describes past channel mobility and defines absolute time constraints on the length of lateral erosion intervals are vital for better understanding the conditions that result in wide bedrock valleys. Analysis of luminescence properties is a key tool for dating fluvial deposits to determine periods of lateral erosion and vertical incision. It also has the potential to illuminate transport processes, such as channel mobility, during periods of sediment deposition. Research conducted during this project has the potential to transform our understanding about the processes and timing of the evolution of bedrock valley systems. Two main project objectives support the overarching goals: (1) learning single-grain luminescence techniques to date the depositional age of sediments with complex transport histories; (2) interpreting luminescence properties as a proxy for fluvial processes, such as channel mobility. Using luminescence techniques to interpret geomorphic processes is an emerging application that has the potential to give insight beyond dating. When this project is complete, the geomorphology community will be closer to interpreting luminescence properties as proxies of transport processes to assess past channel mobility from sediment deposited in association with periods of bedrock valley formation and ultimately a new way of interpreting a wealth of measured, but previously unexamined data.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.

非技术描述通过侵蚀和沉积沉积物，河流系统记录了地球表面的气候，水文学，植被和构造过程的过去变化。尽管已经对基岩景观进行了垂直侵蚀，但对河流的横向侵蚀方式几乎没有共识。建立横向延伸间隔的持续时间至关重要，该横向延伸间隔会产生基岩山谷，以了解河流动力学的变化如何塑造地球表面。通过与沙漠研究所（DRI）的合作，PI将学习发光约会技术，这将使她能够建立侧向侵蚀间隔的时机，并应用这些技术来推断沉积物的运输历史。确定过去和当前河流切口的时机对于预测持续的景观变化对PI家乡堪萨斯州河流附近生活和工作的影响很重要。 The PI's home institution, Kansas State University, will benefit from the professional development of the PI, her extended collaborative network with DRI, and the incorporation of dating techniques in research and teaching to demonstrate how local rivers change on decadal and centennial time scales that humans must be prepared to adapt to.Technical DescriptionThe processes that control vertical incision in bedrock rivers are widely studied and well characterized;但是，在实验室或现场尚未量化控制横向侵蚀的基本过程。描述过去的通道迁移率并在横向侵蚀时间长度上定义绝对时间限制的现场数据对于更好地理解导致宽基岩山谷的条件至关重要。发光特性的分析是与河流沉积物约会以确定横向侵蚀和垂直切口周期的关键工具。在沉积物沉积期间，它还有可能阐明运输过程，例如通道迁移率。该项目期间进行的研究有可能改变我们对基岩谷系统演变过程和时机的理解。两个主要的项目目标支持总体目标：（1）学习具有复杂运输历史的沉积物的沉积年龄，学习单颗粒发光技术； （2）将发光特性解释为河流过程（例如通道迁移率）的代理。使用发光技术来解释地貌过程是一种新兴应用，具有超出约会的洞察力的潜力。 When this project is complete, the geomorphology community will be closer to interpreting luminescence properties as proxies of transport processes to assess past channel mobility from sediment deposited in association with periods of bedrock valley formation and ultimately a new way of interpreting a wealth of measured, but previously unexamined data.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader影响审查标准。

项目成果

Lateral bedrock erosion and valley formation in a heterogeneously layered landscape, Northeast Kansas

堪萨斯州东北部异质层状景观中的侧向基岩侵蚀和山谷形成

• DOI: 10.1002/esp.5172
• 发表时间: 2021
• 期刊: Earth Surface Processes and Landforms
• 影响因子: 3.3
• 作者: Marcotte, Abbey L.;Neudorf, Christina M.;Langston, Abigail L.
• 通讯作者: Langston, Abigail L.

The role of lateral erosion in the evolution of nondendritic drainage networks to dendricity and the persistence of dynamic networks

• DOI: 10.1073/pnas.2015770118
• 发表时间: 2021-04-20
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Kwang, Jeffrey S.;Langston, Abigail L.;Parker, Gary
• 通讯作者: Parker, Gary