Transport Mechanisms across Geomorphic Transitions: Capturing Spatial and Temporal Evolution of River-Floodplain Connectivity within the Trinity River System

跨地貌转变的传输机制：捕捉三一河系统内河流-洪泛区连通性的时空演变

• 批准号: 2150975
• 负责人: Paola Passalacqua
• 金额: $ 35.28万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2150975&HistoricalAwards=false
• 关键词: Transport; Mechanisms; across; Geomorphic; Transitions

Connections between rivers and floodplains control the transport of water, nutrients, pollutants, and other materials through river systems, thus affecting the functioning of rivers, storage of carbon on floodplains, sediment movement, and ecosystem functioning. This project harnesses recent advancements in high-resolution topographic analyses and modeling capabilities, applied to the Trinity River in Texas, to enable new understanding of the interactions between rivers and floodplains. An innovative approach to analyzing the dynamic boundary between river and floodplain is used to improve understanding of how water and other materials move through this complex interface. Project activities also contribute to development and dissemination of river modeling capabilities and the advancement of research-based learning experiences for high school and college students.This project combines an extensive collection of field observations, lidar data sets, numerical modeling, and advanced tools for feature extraction and analysis, to quantify river-floodplain connectivity of the Trinity River, Texas. The research is articulated around a two-part overarching hypothesis that (i) accurate characterization of exchanges in water, solutes, and solids between a river and its floodplain requires treating channel banks as moving internal boundaries, and (ii) these moving boundaries regulate the flow of water and sediment between the two domains in ways that differ in time and space. This research changes the way in which the boundary between the river and its floodplain is commonly viewed and analyzed; from a static boundary demarcating where the river ends and the floodplain begins, to a geomorphic transition whose spatial and temporal evolution controls the interactions between a river and its floodplain. Multiple planned activities integrate research and education to advance the inclusion of diverse groups in the geosciences and engineering and to bridge the gap between data analysts and modelers.This award is co-funded by the Geomorphology & Land-use Dynamics and Hydrologic Sciences programs.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.

河流与洪泛区之间的连接控制了水，养分，污染物和其他材料通过河流系统的运输，从而影响河流的功能，碳存储在洪泛区，沉积物运动和生态系统功能上。该项目利用高分辨率地形分析和建模功能的最新进步，应用于德克萨斯州的三一河，以使人们对河流与洪泛区之间的相互作用有了新的了解。一种用于分析河流和洪泛区之间动态边界的创新方法用于提高对水和其他材料如何通过这种复杂界面移动的理解。项目活动还有助于开发和传播河流建模能力，并为高中和大学生提供基于研究的学习经验。该项目结合了广泛的现场观测，激光雷达数据集，数值建模以及用于量化特征提取和分析的先进工具，以量化Trinity河流河的河流 - 富裕河流连接性。这项研究围绕一个由两部分组成的总体假设阐明，即（i）（i）（i）在河流及其洪泛区之间的水，溶质和固体中的交换的准确表征，需要将通道库视为移动的内部边界，以及（ii）这些移动的边界调节在时间和空间上有不同方式之间水和沉积物之间的移动边界。这项研究改变了通常观察和分析河流与洪泛区之间的边界的方式；从静态边界划定河流结束的地方和洪泛区开始，到一个地貌过渡，其空间和时间进化控制着河流与其洪泛区之间的相互作用。多项计划的活动将研究和教育整合起来，以推动将不同的群体纳入地球科学和工程中，并弥合数据分析师和建模者之间的差距。该奖项由地貌学和土地使用动力学和水文科学计划共同授予，这一奖项反映了NSF的法定任务，并通过评估了范围的范围。