Doctoral Dissertation Research: Roles of Tributaries, Floodplains, and the Anabranching Channels on Suspended Sediment Transport Patterns

博士论文研究：支流、漫滩和分岔河道对悬浮泥沙输送模式的作用

• 批准号: 1558446
• 负责人: Edgardo Latrubesse
• 金额: $ 1.47万
• 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: 2016
• 资助国家: 美国
• 起止时间: 2016-04-01 至 2017-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1558446&HistoricalAwards=false
• 关键词: Doctoral; Dissertation; Research; Roles; Tributaries

NATIONAL SCIENCE FOUNDATIONGEOGRAPHY SPATIAL SCIENCES (GSS) PROGRAMABSTRACTLarge rivers play an important role in the transport of eroded materials, biogeochemical cycles, sustenance of complex ecosystems, biodiversity of their environments, and providing a variety of socio-economic services for humans. Despite their natural and economic importance, developing a fuller understanding of large river processes has been difficult because of the physical and mechanistic complexities of such processes. This doctoral dissertation research project will use innovative methods that include the integration of remotely sensed data with hydrogeomorphologic data to advance basic understanding of sediment distribution patterns in the complex fluvial environments associated with large rivers. The project will provide new insights into the morphodynamics of large rivers by characterizing the spatiotemporal patterns of sediment transport and identifying the hydrosedimentary interactions in channel floodplain systems. Project results will be useful for addressing a broad range of water resources management issues, wetlands preservation ecology problems, and local policy-making questions. The project also will strengthen institutional ties between U.S. and Brazilian universities and scientific centers, and it will incorporate educational outreach to local U.S. schools for support of underrepresented K-12 students in the science. As a Doctoral Dissertation Research Improvement award, this award also will provide support to enable a promising student to establish a strong independent research career.Because sediment plays a major role in the hydrophysical, ecological, and biogeochemical functions of any channel-floodplain system, the assessment of sediment transport and mapping of sedimentary environments over multi-temporal scales have been areas of focus for river scientists across multiple disciplines. The doctoral student whose dissertation research will be supported by this award will focus on two core questions: (1) What are the spatiotemporal patterns of sediment transport at major confluences along an anabranching main river channel? (2) What are the sediment transport, deposition patterns, and sediment budgets in the floodplains? The student will answer these questions by conducting field surveys, geomorphic mapping, and in-situ sample collection at several sites along the Amazon River. He will integrate these field data with remote sensing-derived products to model and characterize the macroscale sediment transport mechanisms in the channel-floodplain systems of the river. Outcomes from this research project would be useful to a global understanding of riverine anabranching patterns as well as shedding new light on the morphodynamics and environmental mechanisms of large river systems around the world.

国家科学基金会地理空间科学 (GSS) 计划摘要大河流在侵蚀物质的运输、生物地球化学循环、复杂生态系统的维持、环境的生物多样性以及为人类提供各种社会经济服务方面发挥着重要作用。 尽管它们具有自然和经济重要性，但由于这些过程的物理和机械复杂性，对大型河流过程进行更全面的了解一直很困难。 该博士论文研究项目将使用创新方法，包括将遥感数据与水文地貌数据相结合，以增进对与大河相关的复杂河流环境中沉积物分布模式的基本了解。 该项目将通过表征沉积物输送的时空模式并确定河道洪泛区系统中的水沉积相互作用，为大河的形态动力学提供新的见解。 项目结果将有助于解决广泛的水资源管理问题、湿地保护生态问题和地方政策制定问题。 该项目还将加强美国和巴西大学和科学中心之间的机构联系，并将向美国当地学校进行教育推广，以支持科学领域代表性不足的 K-12 学生。 作为博士论文研究改进奖，该奖项还将为有前途的学生建立强大的独立研究事业提供支持。由于沉积物在任何河道洪泛区系统的水文、生态和生物地球化学功能中发挥着重要作用，多时间尺度的沉积物迁移评估和沉积环境绘图一直是跨多个学科的河流科学家关注的领域。 获得该奖项支持的博士生论文研究将重点关注两个核心问题：（1）沿分支干流河道主要交汇处沉积物输送的时空模式是什么？ (2) 洪泛区的泥沙输送、沉积模式和泥沙预算是怎样的？ 学生将通过在亚马逊河沿岸的几个地点进行实地调查、地貌测绘和现场样本采集来回答这些问题。 他将把这些现场数据与遥感衍生产品相结合，以模拟和描述河流河道洪泛区系统中的宏观沉积物输送机制。 该研究项目的成果将有助于全球了解河流分支模式，并为世界各地大型河流系统的形态动力学和环境机制提供新的线索。