Measurements of Turbulence and Flow Structure in the Water Column of the Coastal Ocean using PIV

利用 PIV 测量沿海海洋水柱中的湍流和流动结构

• 批准号: 0220890
• 负责人: Thomas Osborn
• 金额: $ 52.84万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0220890&HistoricalAwards=false
• 关键词: Measurements; Turbulence; Flow; Structure; Water

Measurements of Turbulence and flow Structure in the Water Column of the Coastal Ocean using PIVThomas Osborn and Joseph KatzJohn Hopkins UniversityA novel and unique measurement system will be deployed to obtain measurements of oceanic turbulence. A submersible PIV system will be used during 3 campaigns at SABSOON, a coastal observatory in the South Atlantic Bight, to measure turbulence and mean flow characteristics in the bottom 10 m of the water column and to compare these to stratification, wave climate, and circulation. Reynolds stresses, dissipation, production, transport, and buoyancy flux will be related to elevation, mean velocity distribution, shear, stratification, Richardson number, and wave phase. When and where a local balance between production, dissipation, and buoyancy flux holds will be explored. The correlation, or lack thereof, between turbulent and wave stresses will be investigated. The origin of gusts will be characterized. In the context of Large Eddy Simulation (LES) modeling, subgrid scale (SGS) turbulent stresses will be compared to typical parameterizations. Wave-turbulence separation will be performed using a version of the Trowbridge technique.

使用PIV测量沿海海洋水柱中的湍流和流动结构托马斯奥斯本和约瑟夫卡茨约翰霍普金斯大学将部署一个新颖独特的测量系统来获得海洋湍流的测量结果。 在南大西洋湾的沿海观测站SABSOON的3次活动中，将使用潜水式PIV系统测量水柱底部10米处的湍流和平均流特性，并将其与分层、波浪气候和环流进行比较。 雷诺应力、耗散、生产、运输和浮力通量将与高程、平均速度分布、切变、分层、理查森数和波相有关。 何时何地生产，耗散和浮力通量之间的局部平衡将被探讨。 将研究湍流应力和波浪应力之间的相关性或缺乏相关性。 阵风的起源将被描述。 在大涡模拟（LES）建模的背景下，亚网格尺度（SGS）湍流应力将比较典型的参数化。 将使用特罗布里奇技术的一个版本进行波浪-湍流分离。