Boundary Layer Flow and Sediment Transport Dynamics on the Amazon Continental Shelf

亚马逊大陆架边界层流和沉积物输送动力学

• 批准号: 8813399
• 负责人: Richard Sternberg
• 金额: $ 48.89万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-01-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8813399&HistoricalAwards=false
• 关键词: Boundary; Layer; Flow; Sediment; Transport

This project is a continuation of an earlier project that investigated the accumulation of fine-grained sediment on the continental shelf near the mouth of the Amazon River. The earliest research proved that sediment was actively accumulating, and later research identified the sedimentary processes controlling accumulation. This project will examine in detail the operation of the processes and how they affect the formation of sedimentary strata. This new research will be done as the Sedimentology and Stratigraphy portion of AmasSeds (A Multi-disciplinary Amazon Shelf Sediment Study), which is a cooperative project between US and Brazilian scientists. The project involves collaboration of Physical, Chemical, Biological and Geological Sciences. %%% The project will investigate boundary layer flow and suspended sediment dynamics in the shallow marine environment. In view of progress to date and the capabilities of the instrumentation, the next logical step is to extend the work to include wave-current interactions and the details of shelf sediment transport. The proposed objectives are divided into four major unresolved issues resulting from prior Amazon studies: (1) sediment accumulation, (2) physical reworking, (3) dispersal of river sediment, and (4) origin of fine-scale stratigraphy. The project will use the shelf tripod GEOPROBE to collect data to address these issues and also construct a suspended sediment profiling system and use a high frequency echo sounder to investigate river sediment dispersal budgets and fluid mud properties respectively. Cooperative field studies are planned for four stages of river discharge beginning in 1989.

该项目是早期项目的延续， 调查了细颗粒沉积物在 亚马逊河河口附近的大陆架。 的 最早的研究证明， 后来的研究发现， 控制积累的过程。 该项目将在 详细说明流程的操作以及它们如何影响 沉积地层的形成 这项新研究将 作为AmasSeds的沉积学和地层学部分完成 （多学科亚马逊大陆架沉积物研究），这是一个 美国和巴西科学家的合作项目。 的 该项目涉及物理，化学， 生物和地质科学。 %%% 该项目将调查边界层流动和暂停 浅海环境中的沉积动力学。 鉴于 和联合国各机构的能力， 仪器化，下一个合乎逻辑的步骤是将工作扩展到 包括波流相互作用和陆架的细节 泥沙输移 拟议目标分为 亚马逊之前的四个主要未解决问题 研究：（1）沉积物积累，（2）物理改造， (3)河流沉积物的扩散;（4）细尺度的起源 地层学 该项目将使用架子三脚架GEOPROBE 收集数据来解决这些问题，并构建一个 悬浮沉积物剖面系统，并使用高频率 回声探测器调查河流沉积物扩散预算 和流体泥浆特性。 合作领域 计划对河流排放的四个阶段进行研究 从1989年开始。