Quantitative Meso-Scale Mass-Flux Routing Across a Large Tropical Foreland Basin

跨大型热带前陆盆地的定量细观尺度质量通量路由

• 批准号: 9903157
• 负责人: David Montgomery
• 金额: $ 30万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2002-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903157&HistoricalAwards=false
• 关键词: Quantitative; Meso; Scale; Mass; Flux

9903157David R. Montgomery We will study and model the role of foreland basins in modulating the transport of sediment from mountain ranges to lowland rivers and estuaries, developing a quantitative, process-based model of sediment transport and storage, including fine-grained 'washload', by sinuous, mobile rivers. We will develop insights from earlier investigations of floodplain sedimentation processes along the Amazon River by studyingAndean tributaries of the Amazon as they cross the foreland basin of eastern Bolivia. We have initiated field observations and satellite-image interpretation of these Bolivian rivers as an outgrowth of our prior study of the flux of sediment out of the Andes into the foreland basin. The field study will include longitudinal transects along the river to measure channel characteristics required for flow and sediment routing along thechannel and into the floodplain, as well as transects across floodplains to collect sediment cores for 210Pb and 137Cs that will facilitate the testing of calculations and other hypotheses concerning processes that exchange sediment between floodplain and channel. The field sampling will be conducted in the context of a mathematical model of sediment transport and storage (of spatial 'reach-scale' 1-10 km and temporal scale 1 year) in a set of sinuous river channels crossing a broad floodplain. The results ofour study will contribute to theories of the relationship between tectonism, fluvial geomorphology, and sedimentation in basins and along rivers. The study will also address the fluvial geomorphic relationships between sediment transport and channel and floodplain characteristics, and will develop methods for sediment routing through mountain-front reaches of mobile channels and dynamic floodplains which are of interest to scientists, engineers, and resource planners concerned with the habitability of large alluvial valleys.

[9903157] david R. Montgomery我们将研究和模拟前陆盆地在调节沉积物从山脉到低地河流和河口的运输中的作用，建立一个定量的、基于过程的泥沙运输和储存模型，包括细粒度的“冲刷负荷”，由蜿蜒的、流动的河流。我们将通过研究亚马逊河的安第斯支流穿越玻利维亚东部的前陆盆地，从早期对亚马逊河沿岸洪泛区沉积过程的调查中获得见解。我们已经开始了对这些玻利维亚河流的实地观测和卫星图像解释，这是我们之前对安第斯山脉进入前陆盆地的沉积物通量研究的成果。实地研究将包括沿河流的纵向横断面，以测量沿河道和进入泛滥平原的水流和沉积物路线所需的河道特征，以及横跨泛滥平原的横断面，以收集210Pb和137Cs的沉积物岩心，这将有助于测试有关泛滥平原和河道之间交换沉积物过程的计算和其他假设。野外采样将在一组蜿蜒的河流通道中进行泥沙运输和储存的数学模型（空间“河程尺度”为1-10公里，时间尺度为1年）。我们的研究结果将有助于构造、河流地貌和盆地及沿河沉积之间关系的理论研究。该研究还将探讨泥沙运输与河道和洪泛平原特征之间的河流地貌关系，并将开发泥沙通过移动河道和动态洪泛平原的山前河段的方法，这些方法对科学家、工程师和关注大型冲积河谷可居住性的资源规划者很感兴趣。