Collaborative Research: An Inter-disciplinary Approach to Constraining Paleo-geomorphic Responses to the Eocene-Oligocene Hothouse to Icehouse Transition

合作研究：限制始新世-渐新世温室向冰室转变的古地貌响应的跨学科方法

• 批准号: 2023710
• 负责人: Anjali Fernandes
• 金额: $ 25.51万
• 依托单位: Denison University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-23 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2023710&HistoricalAwards=false
• 关键词: Collaborative; Research; Inter; disciplinary; Approach

Rivers are the arteries of the nation and are vital as sources of water and recreation, and avenues of commerce. They are also bellwethers for change in the landscape. However, a question of fundamental importance for national interest is how river systems respond to major environmental changes. Predicting how changes in environmental conditions affect river processes, such as flooding and erosion, is critical for water resource management. This project uses knowledge of the past as a key to better inform the present through examining ~35 million year old sediments from an ancient river network in western Nebraska and South Dakota to quantify how changes in precipitation, vegetation and temperature in the past caused changes in river discharge and flood magnitude. These data, integrated with hydraulic models, will improve our ability to predict how rivers flood, sediment is transported and catchments evolve. Results of this work will have far reaching implications for understanding, modeling and planning for changes to river systems in the future. Three key broader impacts of this study include: 1) support of graduate and undergraduate students to develop interdisciplinary expertise; 2) sharing of data, methods and results as teaching data-sets on open-access platforms; 3) science outreach modules for children to explore 3-dimensional rock outcrops and animations from computational models. The goal of the proposed research is to reconstruct the coevolution of paleoriver and ecosystems dynamics with environmental change in western North America during the Eocene-Oligocene transition (EOT), perhaps the largest climate state change of the last 65 million years. This will be accomplished by integrating geochemical records of paleoclimate, sedimentologic indicators of river transport and deposition, and hydraulic-geomorphic models. To achieve the project goals a team of geochemists, sedimentologists and hydraulic engineers will develop an integrated approach to understanding how rivers respond to environmental change. Success in this cross-disciplinary approach could provide a paradigm shift in utilizing modern and ancient terrestrial geologic archives to quantify environmental perturbations that manifest in the hydraulics, morphodynamics and regional ecosystem responses.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.

河流是国家的动脉，作为水源和娱乐来源以及商业通道至关重要。它们也是景观变化的领头羊。然而，对国家利益至关重要的一个问题是河流系统如何应对重大环境变化。预测环境条件的变化如何影响河流过程（例如洪水和侵蚀）对于水资源管理至关重要。该项目利用过去的知识作为更好地了解现在的关键，通过检查来自内布拉斯加州西部和南达科他州的一个古老河网的约 3500 万年前的沉积物来量化过去降水、植被和温度的变化如何导致了现在的变化。河流流量和洪水强度。这些数据与水力模型相结合，将提高我们预测河流洪水、泥沙输送和流域演变的能力。这项工作的结果将对未来河流系统变化的理解、建模和规划产生深远的影响。这项研究的三个关键更广泛的影响包括：1）支持研究生和本科生发展跨学科专业知识； 2）在开放平台上共享数据、方法和结果作为教学数据集； 3) 科学外展模块，让孩子们通过计算模型探索 3 维岩石露头和动画。拟议研究的目标是重建北美西部始新世-渐新世过渡期 (EOT) 期间古河流和生态系统动态随环境变化的协同演化，这可能是过去 6500 万年来最大的气候状态变化。这将通过整合古气候的地球化学记录、河流输送和沉积的沉积学指标以及水力地貌模型来实现。为了实现项目目标，由地球化学家、沉积学家和水利工程师组成的团队将开发一种综合方法来了解河流如何响应环境变化。这种跨学科方法的成功可以为利用现代和古代陆地地质档案来量化水力学、形态动力学和区域生态系统响应中表现的环境扰动提供范式转变。该奖项反映了 NSF 的法定使命，并被认为值得通过以下方式获得支持：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。