Laboratory study: Sediment transport in wave-supported gravity currents

实验室研究：波浪支撑重力流中的沉积物输送

• 批准号: 0826592
• 负责人: Alexander Horner-Devine
• 金额: $ 36.49万
• 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: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0826592&HistoricalAwards=false
• 关键词: Laboratory; study; Sediment; transport; wave

Horner-DevineAbstractThe PIs will combine a series of laboratory experiments with field observations with the aim of improving our understanding of the vertical structure of wave supported gravity currents (WSGC). Specifically, the proposed laboratory studies will address whether the high concentrations of suspended sediment necessary to initiate down-slope transport can be achieved solely by resuspension, or whether sediment convergence is necessary. The work has important implications for sediment transport in a wide range of environments. Previous observations of high concentration fluid muds in energetic oceanic environments have been largely limited to areas with extremely high fluvial sediment input. Understanding the role of sediment supply to the formation and initiation of this mode of sediment transport will improve the understanding of cross-shelf sediment transport. Across-shelf transport by wave-supported turbidity currents is a newly identified, potentially dominant mechanism for moving fine sediment (and associated constituents such as carbon and contaminants) across continental shelves. The project will also support one graduate student, enhance undergraduate courses, and provide outreach to pre-college students through the UW Open House.

Horner-Devine摘要PI将结合联合收割机一系列的实验室实验和现场观测，目的是提高我们对波浪支持重力流（WSGC）垂直结构的理解。具体而言，拟议的实验室研究将探讨是否可以通过再悬浮实现启动下坡运输所需的高浓度悬浮泥沙，或者是否需要泥沙汇聚。这项工作对各种环境中的沉积物输运具有重要意义。以前在充满活力的海洋环境中观察到的高浓度流体泥浆在很大程度上局限于河流沉积物输入量极高的地区。了解沉积物供应对这种沉积物输运方式的形成和启动的作用，将增进对跨大陆架沉积物输运的了解。波浪支持的浊流的跨大陆架迁移是一种新发现的、可能是在大陆架上移动细沉积物（以及碳和污染物等相关成分）的主要机制。该项目还将支持一名研究生，加强本科课程，并通过UW开放日为大学预科学生提供外展服务。