Large eddy simulation of turbulent wind over realistic seas with frequent wave breaking events

具有频繁波浪破碎事件的真实海洋上的湍流风的大涡模拟

• 批准号: 0824906
• 负责人: Tetsu Hara
• 金额: $ 25.96万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0824906&HistoricalAwards=false
• 关键词: Large; eddy; simulation; turbulent; wind

Air-sea interaction under high wind and sea state conditions is one of the most important, yet least understood research areas of physical oceanography and marine meteorology. Breaking waves, which support a significant fraction of air-sea momentum flux, alters the turbulence field inside the atmospheric boundary layer. This variation results in insufficient estimations of (Reynolds) numbers which are used in boundary layer models and predictions. The Large Eddy Simulation (LES) is a promising new model that will take the effects of ocean surface waves into account when modeling turbulence dynamics inside the atmospheric boundary layer. Through this research, oceanographers and atmospheric scientists from the University of Rhode Island, the National Center for Atmospheric Research, and the University of Reading will develop a new atmospheric boundary layer LES methodology that accounts for intermittent breaking wave events. This simulation will allow for a detailed investigation of the effects of breaking waves on boundary layer turbulence and air-sea momentum flux and will provide the framework to investigate sea spray generation, evolution, and its impact on air-sea heat flux. The results from this research will provide a basis for understanding how surface breaking waves affect and air-sea interactions, which could be used in more accurately forecasting extreme winds and waves during natural hazard events.

大风海况下的海气相互作用是物理海洋学和海洋气象学中最重要但却最不为人所知的研究领域之一。海气动量通量的很大一部分是由破碎波提供的，它改变了大气边界层内的湍流场。这种变化导致对边界层模式和预报中使用的(雷诺数)数估计不足。大涡模拟(LES)是一种很有前途的新模式，它在模拟大气边界层内的湍流动力学时将考虑海面波的影响。通过这项研究，来自罗德岛大学、国家大气研究中心和雷丁大学的海洋学家和大气科学家将开发一种新的大气边界层LES方法，该方法可以解释间歇性破碎波事件。这一模拟将允许详细研究破碎波对边界层湍流和海气动量通量的影响，并将为研究海雾的产生、演变及其对海气热通量的影响提供框架。这项研究的结果将为了解海面破碎波的影响和海气相互作用提供基础，可以用于更准确地预测自然灾害事件期间的极端风浪。