Long-Term Mobility and Storage of Sediments in Watersheds ofthe Upper Mississippi Valley

密西西比河上游流域沉积物的长期流动和储存

• 批准号: 8707504
• 负责人: James Knox
• 金额: $ 12.98万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1990-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707504&HistoricalAwards=false
• 关键词: Long; Term; Mobility; Storage; Sediments

The general objective of this research is to quantify the physical processes that influence the linkages, pathways, and time constants that separate erosion of sediment at its source and its ultimate removal from watersheds of the Upper Mississippi Valley. Responses of sediment mobility and storage to environmental changes in watersheds will be examined on three time scales, including: historical, Holocene (post- glacial), and late-Wisconsin (late-glacial). Results of the research contribute to improving the understanding of how environmental changes, operating at differing time and spatial scales, influence the type of quantity of sediment that is either stored or transported at various locations in watersheds of a humid climate region. Methodology includes: (1) field stratigraphic studies of sediment stored as colluvium, alluvial fan, terrace, and floodplain deposits, (2) laboratory sedimentological and geochemical analyses, and (3) statistical analyses that link archival data on climate, stream runoff, and land use to the field stratigraphic and laboratory results. The research should provide critical information that tests the hypothesis that erosion, storage, and delivery of sediment in watersheds is an episodic process that is dependent upon the occurrence of specific events which influence thresholds of sediment stability.

本研究的总体目标是量化 物理过程，影响的联系，途径， 时间常数，将沉积物在其源头处的侵蚀分开 以及它最终从上河流域 密西西比河谷。 泥沙运动和泥沙储存的响应 对流域环境变化的影响将在 三个时间尺度，包括：历史，全新世（后， 冰川期（late-glacial）和威斯康星晚期（late-wisconsin）。 结果 研究有助于提高人们对 环境变化，在不同的时间和空间运行 尺度，影响沉积物的数量类型， 在流域的不同地点储存或运输 气候潮湿的地区。 研究方法包括：（1）实地考察 以崩积层、冲积层形式储存的沉积物的地层学研究 扇、阶地和河漫滩沉积，（2）实验室 沉积学和地球化学分析，以及（3）统计 将气候、径流和气候变化的档案数据联系起来的分析， 土地利用的野外地层和实验室结果。 这项研究应该提供关键信息， 泥沙侵蚀、储存和输送假设 流域是一个偶发的过程， 影响阈值的特定事件的发生 沉积物稳定性