Gravity Currents and Large-Amplitude Internal Waves

重力流和大振幅内波

• 批准号: 1029773
• 负责人: Brian White
• 金额: $ 36.7万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1029773&HistoricalAwards=false
• 关键词: Gravity; Currents; Large; Amplitude; Internal

Gravity currents and nonlinear internal waves with trapped cores are common features in the coastal ocean. Propagating gravity currents can generate large-amplitude nonlinear internal waves, while shoaling nonlinear internal waves can develop re-circulating cores of trapped fluid. The project is a collaborative study of the dynamics of gravity currents and nonlinear internal waves with trapped cores, including parallel complementary laboratory experiments. Wave tank experiments will focus on the stages of transition between steady gravity currents and internal wave generation,and theory and experiments for waves with trapped cores. The project will investigate: what types of core circulations are possible, how they depend on the wave generation mechanism, the development of shear instabilities, how long core fluid is trapped, and the implications for long-range mass transport. Experimental results will be compared with high-resolution non-hydrostatic numerical calculations.The results of this study could lead to substantial insights in coastal ocean circulation, mixing, and near-field river plume behavior. A major emphasis of the experimental and numerical studies is the dissemination of key results to collaborators to improve interpretation of field observations and parameterizations in regional models. As a key unknown in larval dispersal, horizontal transport by trapped cores can be of use to biologists modeling benthic population connectivity. The project will support the Ph.D. thesis work of two graduate graduate students, and involve one or more GFD fellows.

重力流和带有被困核心的非线性内波是沿海海洋的常见特征。传播的重力流可以产生大振幅的非线性内波，而浅滩的非线性内波可以形成被困流体的再循环核心。 该项目是对重力流和带有捕获核心的非线性内波动力学的合作研究，包括并行互补的实验室实验。造波池实验将重点研究稳定重力流与内波产生之间的过渡阶段以及带有困芯波的理论和实验。该项目将研究：什么类型的核心循环是可能的，它们如何依赖于波浪产生机制，剪切不稳定性的发展，核心流体被捕获的时间，以及对远程质量传输的影响。实验结果将与高分辨率非流体静力数值计算进行比较。这项研究的结果可能会给沿海海洋环流、混合和近场河流羽流行为带来重要的见解。实验和数值研究的一个主要重点是将关键结果传播给合作者，以改进对区域模型中现场观测和参数化的解释。作为幼虫扩散的一个关键未知因素，被困核心的水平运输可用于生物学家模拟海底种群的连通性。 该项目将支持博士学位。两名研究生的论文工作，并涉及一名或多名 GFD 研究员。