Collaborative Research: RUI: Investigating the role of hillslope processes in modulating topologic change of upland drainage basins.

合作研究：RUI：研究山坡过程在调节高地流域拓扑变化中的作用。

• 批准号: 2225461
• 负责人: Kristin Sweeney
• 金额: $ 26.09万
• 依托单位: University of Portland
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-02-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2225461&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Investigating; role

Watershed boundaries, or drainage divides, control the flux of water and sediment in a landscape and drive evolution and speciation of aquatic organisms. Over geologic time, drainage divides move in response to changes in climate and tectonics. This work explores how the motion of divides differs between gently sloping, soil-mantled landscapes and steep, mountainous, rocky areas. Specifically, the researchers will compare landscapes where soil creeps along hillslopes with those where material is primarily transported through landslides. They will use digital mapping techniques, field measurements of soil and sediment characteristics, and theoretical models of landscape evolution to investigate the ingredients that affect divide motion. Unlike previous research, which focuses on river channels, this work emphasizes processes that occur on hillslopes. Topographic analysis, field measurements of grain size, and erosion rates from cosmogenic nuclides illustrate the role of non-fluvial processes in modulating topographic change of drainage basins. To capture hillslope and colluvial transport regimes in landscapes ranging from soil-mantled to rocky, this work leverages measurements from field sites across a range of regional erosion rates (Ozark Plateau, Oregon Coast Range, San Gabriel Mountains). In addition to testing existing topographic metrics for divide instability, this work seeks quantitative methodological improvements to better incorporate steep landscapes into theoretical frameworks that describe and predict divide instability.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.

分水岭的边界或排水鸿沟，控制景观中的水和沉积物的通量，并驱动水生生物的进化和物种形成。在地质时间内，排水鸿沟会随着气候和构造变化的响应而移动。这项工作探讨了划分的运动如何在轻轻倾斜，土壤保密景观与陡峭，山区岩石区域之间有所不同。具体而言，研究人员将比较景观，其中土壤沿着山坡蔓延到主要通过滑坡运输的材料的景观。他们将使用数字映射技术，土壤和沉积物特征的现场测量以及景观演化的理论模型来研究影响分裂运动的成分。与以前关注河道的研究不同，这项工作强调了山坡上发生的过程。 地形分析，晶粒尺寸的现场测量以及宇宙核素的侵蚀速率说明了非易流过程在调节排水盆地地形变化中的作用。为了捕获从土壤到岩石的景观中的山坡和碰撞运输方式，这项工作利用了各个区域侵蚀率（Ozark Plateau，Ozark Plateau，San Gabriel Mountains）的野外地点进行测量。除了测试现有的地形指标以划分不稳定性外，这项工作还寻求定量的方法学改进，以更好地将陡峭的景观纳入描述和预测划分不稳定性的理论框架中。该奖项反映了NSF的法定任务，并被认为是通过使用该基金会的评估来获得支持的，并被认为是值得的。智力优点和更广泛的影响审查标准。