CAREER: Parameterizations of Langmuir Turbulence in Shallow Water

职业：浅水中朗缪尔湍流的参数化

• 批准号: 0846510
• 负责人: Andres Tejada-Martinez
• 金额: $ 48万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0846510&HistoricalAwards=false
• 关键词: CAREER; Parameterizations; Langmuir; Turbulence; Shallow

0846510 Tejada-MartinezThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Historically, Langmuir circulation (LC) is characterized by pairs of parallel counter-rotating vortices oriented approximately in the downwind direction driven by the wave- and wind-driven turbulence within the upper ocean mixed layer. The highly resolved field measurements of Gargett et al. (2004) first identified full-depth LC in shallow water with dominant effects on the mixing process and sediment re-suspension on the bottom boundary layer. These unique measurements have drastically changed perceptions of what turbulent processes are important on shallow shelves. The PI's large-eddy simulation (LES) of full-depth LC shows favorable agreement with the in-water observations of the turbulent structure. The PI will focus on LES computations of the interaction of LC with the bottom boundary layer and its impact on the gas transfer and temperature at the air-water interface. Studies will be guided and validated by comparisons with field measurements. Preliminary LES computations have revealed that the homogenizing action of LC introduces a deviation from the classical law-of-the-wall behavior often invoked for the bottom boundary layer. Furthermore, LES has shown that full-depth LC can increase the surface gas transfer efficiency by 30%. These studies will lead to new RANS (Reynolds-averaged Navier-Stokes) parameterizations accounting for its effects on bottom boundary layer turbulence in coastal regions. These studies will also lead to new bulk parameterizations of gas transfer at the air-water interface and temperature across the surface thermal boundary layer.An educational program is designed to introduce computational science and turbulence in the environment to high school and undergraduate students. Through the NSF-sponsored Research Experiences for Teachers program at USF, high school teachers will gain experience in scientific computations by participating in summer research projects. Simulations will also be incorporated into the PI's Basic Fluid Mechanics third-year undergraduate level course. A citizen science network will be established to record LC events in the Tampa Bay region and promote environmental awareness. This project is being co-funded by the Engineering, Geosciences, and Cyber Infrastructure Directorates.

0846510 tejada - martinez该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。从历史上看，Langmuir环流（LC）的特征是由上层海洋混合层中由波浪和风驱动的湍流驱动的大约在顺风方向的平行反旋转涡对。Gargett et al.（2004）的高分辨率野外测量首次发现，浅水全深度LC对底部边界层的混合过程和沉积物再悬浮起主导作用。这些独特的测量结果极大地改变了人们对湍流过程在浅大陆架上的重要性的认识。PI对全深度LC的大涡模拟结果与湍流结构在水中的观测结果吻合较好。PI将侧重于LC与底部边界层相互作用的LES计算及其对空气-水界面气体传递和温度的影响。将通过与实地测量的比较来指导和验证研究。初步的LES计算表明，LC的均匀化作用导致了对底部边界层的经典壁律行为的偏离。此外，LES研究表明，全深度LC可以将表面气体传递效率提高30%。这些研究将导致新的RANS （reynolds -average Navier-Stokes）参数化，以解释其对沿海地区底边界层湍流的影响。这些研究还将导致空气-水界面和表面热边界层温度的气体传递的新整体参数化。一个教育项目旨在向高中和本科生介绍计算科学和环境中的湍流。通过美国国家科学基金会赞助的USF教师研究经验计划，高中教师将通过参加暑期研究项目获得科学计算经验。模拟也将纳入PI的基础流体力学本科三年级课程。将建立一个公民科学网络，以记录坦帕湾地区的LC事件并提高环境意识。该项目由工程、地球科学和网络基础设施局共同资助。