Collaborative Research: Perdigao--The Stable Boundary Layer over Complex Terrain

合作研究：Perdigao——复杂地形上的稳定边界层

• 批准号: 1565483
• 负责人: Fotini Chow
• 金额: $ 36.88万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1565483&HistoricalAwards=false
• 关键词: Collaborative; Research; Perdigao; Stable; Boundary

The lowest part of the atmosphere, known as the boundary layer, changes character from being well-mixed with frequent air movement during the day to a nocturnal state of stability and stratification. However, despite the overall stability of the nocturnal boundary layer, there is still intermittent turbulent air movement. This study will leverage a large field campaign effort in Portugal, known as Perdigao, to study the stable boundary layer in complex topography. Better understanding of turbulence and wind flow in complex terrain will improve numerical weather models and support critical applications such as air quality, aviation, wind energy, transportation, and climate modeling. The project will also contribute to the education and training of the next generation of scientists and the researchers will contribute to public literacy of science through various outreach efforts.The Perdigao field experiment is part of a large European campaign to improve the efficiency of wind energy production. This award will bring in a basic research component with a focus on studying the mechanisms controlling turbulence intermittency in stable boundary layers in complex terrain. This will be a combined observational and modeling effort, with additional observational data provided by the Univ. of Colorado at Boulder's Tethered Lifting System (TLS) and three profiling Lidars. The modeling component will make use of the WRF model with an immersed boundary method (IBM) implemented in order to enable simulation over steep terrain surfaces, and the model simulations will be able to nest down to 5m in the horizontal and 0.5m in the vertical. The researchers plan to address the following questions: (i) What is the structure of turbulence budgets, especially turbulence dissipation rate, within and above the valley? How does it change with the evolution of stability, particularly under stable conditions? (ii) What mechanisms generate intermittency of the turbulence? How is the intermittent turbulence within and above the valley represented in large-eddy simulations? (iii) How are coherent structures affected by the wind turbine wake? How does this influence intermittency? (iv) What physical parameterizations and numerical techniques are needed to appropriately integrate mesoscale and microscale models in complex terrain?

大气的最低部分（称为边界层）从白天经常被空气流动的频繁混合到稳定性和分层的夜间状态。 然而，尽管夜间边界层的整体稳定性，但仍存在间歇性的湍流运动。 这项研究将利用葡萄牙的大型现场活动工作，称为Perdigao，以研究复杂地形的稳定边界层。 更好地了解复杂地形中的湍流和风流将改善数值模型，并支持关键应用，例如空气质量，航空，风能，运输和气候建模。 该项目还将为下一代科学家的教育和培训做出贡献，研究人员将通过各种宣传工作为公共科学素养做出贡献。PerdigaoField实验是提高风能生产效率的欧洲大型运动的一部分。 该奖项将带来一个基础研究组成部分，重点是研究控制复杂地形稳定边界层的湍流间歇性的机制。 这将是一项合并的观察和建模工作，并提供由大学提供的其他观察数据。科罗拉多州的科罗拉多州的束缚起重系统（TLS）和三个分析激光雷达。 建模组件将使用实现的浸没边界方法（IBM）的WRF模型，以便在陡峭的地形表面上进行模拟，并且模型模拟将能够在水平方向嵌套到5m，在垂直方向上为0.5m。 研究人员计划解决以下问题：（i）在山谷内外，湍流预算，尤其是湍流耗散率的结构是什么？随着稳定性的演变，特别是在稳定条件下，它如何改变？ （ii）哪些机制产生了湍流的间歇性？大涡模拟中山谷内外的间歇性湍流如何？ （iii）如何受风力涡轮机唤醒影响相干结构？这如何影响间歇性？ （iv）需要哪些物理参数化和数值技术来适当地整合复杂地形中的中尺度和微观模型？