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.

智力价值：该项目旨在通过对连接到广阔盆地的两层基台流的旋转水力学的全面研究，扩展我们目前对深层溢流的理解。两层动力学被认为在包括丹麦海峡、法罗河岸海峡和维马海峡在内的许多重要通道的溢流中非常重要，无论是在解释地表逆流的影响还是在解释流入通道并包含在溢流中的不同水团的演化方面。这项研究将分析和数值技术应用于许多基本问题，包括交换和单向流情况下双层水力理论与邻近盆地流动的动态一致联系、深层的愿望、水力控制识别的一般方法和特殊特征的隔离，例如任意横截面通道中的水力跳跃，以及海峡和海峡中时间依赖性的作用。 盆地-海峡耦合系统。对这些问题的阐明将有助于解释更复杂的数值模型、观测结果，并有助于规划上游盆地内溢流输送的长期监测策略。此外，研究人员将继续寻找呈现结果的方法，以利于直觉并易于非专业人士理解。 更广泛的影响：深层通道提供了监测翻转循环的理想点。然而，只有在发展了具有更高现实性的水力学理论并且了解了海峡和盆地流动之间的动力联系之后，才能正确地做到这一点。这项工作将开始回答其中一些问题，并且除了这里探讨的具体动态之外，应该引起广泛的兴趣。两位研究人员都积极参与 MIT/WHOI 联合项目，这项研究的结果将很快传到课堂。 一小部分拨款将用于支持完成有关海洋海峡和基台流以及水力学在地球物理学中的其他应用的研究生课程。 该赠款还将为研究生完成论文提供持续支持。