Analytical and Numerical Studies of Deep Overflows and Related Circulations

深度溢出及相关循环的分析和数值研究

• 批准号: 0525729
• 负责人: Lawrence Pratt
• 金额: $ 78.64万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0525729&HistoricalAwards=false
• 关键词: Analytical; Numerical; Studies; Deep; Overflows

Intellectual Merit:This project seeks to extend our current understanding of deep overflows through a comprehensive study of rotating hydraulics of two-layer sill flows connected to broad basins. Two-layer dynamics are thought to be important in the overflows of a number of important passages, including the Denmark Strait, the Faroe-Bank Channel, and the Vema Channel, either in accounting for the influence of reverse flows at the surface or the evolution of distinct water masses feeding the channel and contained within the overflows. This study brings analytical and numerical techniques to bear on a number of fundamental issues including the dynamically consistent connection of two-layer hydraulic theory to the neighboring basin flows for both exchange and unidirectional flow cases, aspiration of deep layers, general methods for the identification of hydraulic control and the isolation of special features such as hydraulic jumps in channels with arbitrary cross section, and the role of time-dependence in straits and coupled basin-strait systems. The elucidation of these issues will aid in the interpretation of results from more complicated numerical models, observations, and in the planning of strategies for long-term monitoring of overflow transport from within upstream basins. Also, the investigators will continue to find ways of presenting the results so as to favor the intuition and to be accessible to the non-specialist. Broader Impacts:Deep passages offer ideal points to monitor the overturning circulation. However, this can only be done properly after development of hydraulic theories with improved realism and once the dynamical connections between strait and basin flows are understood. This work will begin to answer some of these questions and should be of wide interest beyond the specific dynamics explored here. The two investigators are both active in the MIT/WHOI Joint Program and the results of this research will quickly reach the classroom. A small percentage of the grant will support the completion of a graduate text on ocean strait and sill flow and other applications of hydraulics in geophysics. The grant will also provide continuing support for a graduate student to complete his thesis.

知识分子的优点：该项目旨在通过对与宽阔盆地相连的两层门槛流的旋转液压的全面研究来扩展我们当前对深层溢出的理解。两层动态被认为在许多重要段落的溢出中很重要，包括丹麦海峡，法罗 - 银行通道和VEMA通道，可以考虑到表面反向流的影响或演变的影响。供水通道并包含在溢出中的不同水质量。这项研究带来了分析和数值技术，可以在许多基本问题上进行，包括将两层液压理论与邻近盆地流动的动态连接，以进行交换和单向流动案例，深层的吸引力，一般方法，用于识别鉴定的一般方法液压控制和特殊特征的隔离，例如在具有任意横截面的通道中的液压跳跃，以及时间依赖性在海峡和耦合盆地特征系统中的作用。阐明这些问题将有助于解释更复杂的数值模型，观察结果以及计划长期监测从上游盆地内溢流运输的策略的结果。同样，研究人员将继续找到呈现结果的方法，以偏爱直觉并可以被非特权主义者访问。 更广泛的影响：深层通道提供了理想的观点来监视倾覆的循环。但是，只有在建立液压理论以改善现实主义的发展后，才能正确地进行，并且一旦了解海峡和盆地流之间的动态联系。这项工作将开始回答这些问题中的一些，并且在这里探讨的具体动态之外应该引起广泛的兴趣。两名调查人员都活跃于麻省理工学院/WHOI联合计划，这项研究的结果将很快到达教室。 一小部分赠款将支持完成有关海峡和凹痕流的研究生文本，以及在地球物理中液压药的其他应用。 该赠款还将为研究生完成论文提供持续的支持。