CAREER: Parameterizations of Langmuir Turbulence in Shallow Water

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。历史上，朗缪尔环流（LC）的特征是由上层海洋混合层内波浪和风驱动的湍流驱动的平行反向旋转涡对，大致沿顺风方向定向。加吉特等人（2004年）进行的高分辨率实地测量首次确定了浅水中的全深度LC，对混合过程和底边界层上的沉积物再悬浮具有主要影响。这些独特的测量极大地改变了人们对浅水陆架上重要湍流过程的看法。PI的大涡模拟（LES）的全深度LC显示出良好的协议与在水中的湍流结构的观察。PI将侧重于LC与底部边界层的相互作用及其对空气-水界面处的气体传输和温度的影响的LES计算。研究将通过与实地测量结果的比较来指导和验证。初步的LES计算表明，LC的扰动作用引起了与常用于底边界层的经典壁面定律行为的偏离。此外，LES已经表明，全深度LC可以将表面气体传输效率提高30%。这些研究将导致新的RANS（雷诺平均Navier-Stokes）参数化占其在沿海地区的底边界层湍流的影响。这些研究也将导致新的整体参数化的气体传输在空气-水界面和温度的表面热边界层。一个教育计划的目的是介绍计算科学和湍流的环境中的高中和本科生。通过NSF赞助的USF教师研究经验计划，高中教师将通过参加夏季研究项目获得科学计算方面的经验。模拟也将纳入PI的基础流体力学第三年本科水平的课程。将建立一个公民科学网络，记录坦帕湾地区的LC活动，并提高环境意识。该项目由工程、地球科学和网络基础设施管理局共同资助。

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.