Collaborative Research: Defining the role of heterogeneous lithology in bedrock incision and terrace formation in the Buffalo National River, Arkansas

合作研究：确定异质岩性在阿肯色州布法罗国家河基岩切割和阶地形成中的作用

• 批准号: 1325022
• 负责人: Amanda Keen-Zebert
• 金额: $ 31.28万
• 依托单位: Murray State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-15 至 2013-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1325022&HistoricalAwards=false
• 关键词: Collaborative; Research; Defining; role; heterogeneous

This research will contribute to understanding how landscapes in low topography settings respond to changes in base level (i.e. sea level). These processes are central to interpreting spatial and temporal variation in sediment storage and erosion and have implications for understanding soil loss, pollutant sequestration in soils and floodplains, and flood attenuation over long timescales. The results will also facilitate reconstructions of the changes in the Earth's surface in the mid-continent of North America which can provide baseline information from pre-European human landscapes with which to contextualize modern human impacts and thus guide restoration and management.Through the use of geochronology, field observation, topographic analysis, and GIS we will investigate unresolved problems in geomorphology regarding the impact of variations in lithology on fluvial processes, specifically how lithology impacts bedrock valley and unpaired terrace formation. This project seeks to bring together understanding of processes at variable scales to determine the drivers of river incision in a mid-continent setting south of the glacial limit and to determine whether incision of the Buffalo National River valley has been driven by climate change, base level fall, local processes operating at the scale of the meander, or a combination thereof. The outcomes of this work will improve reconstructions of past landscapes including changes in the hydrologic cycle south of the glacial limit in North America, how bedrock rivers change over time, and how the sedimentary record is created and preserved in caves and alluvial terraces.

这项研究将有助于了解低地形设置中的景观如何应对基本水平的变化（即海平面）。 这些过程对于解释沉积物储存和侵蚀的空间和时间变化至关重要，并且对了解土壤损失，土壤和洪泛区中的污染物固隔以及长时间时间表的洪水衰减具有影响。 结果还将促进北美中部地球表面变化的重建，可以从欧洲前的人类景观中提供基线信息，以使现代人类的影响与现代人类的影响相关，从而指导和指导恢复。岩性如何影响基岩山谷和未配对的露台地层。 该项目旨在使对可变尺度的过程的理解汇集在一起​​，以确定冰川限制以南的中间环境中的河流切口的驱动因素，并确定是否驱动了布法罗国家河谷的切口，是由气候变化，基本水平降落，在蜿蜒曲折的尺度上运行的本地流程或组合。 这项工作的结果将改善过去景观的重建，包括北美冰川极限以南的水文循环的变化，基岩河流如何随时间变化以及如何在洞穴和冲积露台中创建和保存沉积记录。