US-France Cooperative Research: Laboratory and Numerical Modeling of Topographic Effects on Oceanic Currents Along Sloping Surfaces

美法合作研究：地形对倾斜表面洋流影响的实验室和数值模拟

• 批准号: 8820464
• 负责人: Don Boyer
• 金额: $ 1.48万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-15 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8820464&HistoricalAwards=false
• 关键词: US; France; Cooperative; Research; Laboratory

This award will support collaborative research between Dr. Donald Boyer, Arizona State University, and Dr. Gabriel Chabert d'Hieres, Institut de Mecanique de Grenoble, France. This research seeks to investigate the nature of the flow of homogeneous and two-layer rotating flows along model coastlines (or sloping floors in the deep ocean), including the interaction of such flows with topography. The modeling parameters for this system include the Rossby, Ekman and Burger numbers, the slope of the shelf along the coastline and geometric parameters characterizing the topography. Primary consideration will be given to such cases in which the Burger number is small, so that the effects of stratification can be neglected. The research will include laboratory experiments and analytical and numerical quasigeostrophic models. The laboratory investigations are to be conducted in the 13 meter diameter rotating tow tank of the Institut de Mecanique, Grenoble, France. This facility permits experiments with shelf slopes approximately one order of magnitude smaller than those on more conventional turntables (i.e. one to two meters in diameter) and thus allows one to more closely simulate this parameter for possible oceanic applications. The initial laboratory experiments will concentrate on understanding the background flow for the case of along-shore currents in which no obstacle is present and for which the shoreline is either on the left or on the right. The interaction of these background flows with topography will then be addressed. Particular attention will be focused on the conditions for which such phenomena as blocking, eddy shedding and trapped Rossby waves occur. The results of this research will contribute to the understanding of basic features of topographic effects on oceanic currents along sloping surfaces. The Grenoble facility is unique and the experience gained in this project will be valuable for the further development of a similiar facility in the U.S.

该奖项将支持亚利桑那州立大学的Donald Boyer博士和法国格勒诺布尔Mecanique研究所的Gabriel Chabert d'Hieres博士之间的合作研究。本研究旨在研究沿模型海岸线（或深海斜坡）的均匀和双层旋转流的流动性质，包括这种流动与地形的相互作用。该系统的建模参数包括rosssby、Ekman和Burger数、大陆架沿海岸线的坡度和表征地形的几何参数。我们将主要考虑汉堡数较小的情况，以便可以忽略分层的影响。研究将包括实验室实验、分析和数值拟地转模型。实验室调查将在法国格勒诺布尔Mecanique研究所直径13米的旋转拖槽中进行。这个设备允许用比传统的转盘（即直径1至2米）小约一个数量级的陆架坡度进行实验，因此可以更接近地模拟这一参数，以用于可能的海洋应用。最初的实验室实验将集中于了解没有障碍物、海岸线在左边或右边的沿岸流的背景流。然后将讨论这些背景流与地形的相互作用。我们将特别关注发生阻塞、涡流脱落和困住罗斯比波等现象的条件。研究结果将有助于了解地形对坡面海流影响的基本特征。格勒诺布尔设施是独一无二的，在这个项目中获得的经验将对美国类似设施的进一步发展有价值