Effect of thermal stability on wind turbine wakes: an experimental and analytical study [0.03%]
热稳定性对风力涡轮机尾流影响的实验和分析研究
Arslan Salim Dar,Konstantinos Kotsarinis,Fernando Porté-Agel
Arslan Salim Dar
We present first results from the thermally stratified boundary layer wind tunnel at EPFL, Switzerland. Stable, neutral, and convective thermal stability conditions are developed in the wind tunnel using temperature control of the floor and...
Estimating and Evaluating Roughness Length and Displacement Height in Heterogeneous Urban Environments [0.03%]
异质城市环境中估计和评估粗糙长度和位移高度
Jason P Horne,Ying Pan,Kenneth J Davis
Jason P Horne
The roughness length ( z 0 ) and displacement height ( z d ) are essential surface-layer parameters in numerical models (e.g., weather, climate, wall-modeled LES, etc.). This work evaluates the consistency of z 0 and z d estimates from ...
Including dispersive shear stress in urban environments for single column dispersion models [0.03%]
考虑城区环境中的散射剪切应力的单柱散射模型研究
Jonathan Retter,David Heist,Michael Pirhalla et al.
Jonathan Retter et al.
Most single-column, Gaussian dispersion-model algorithms exclusively consider the time-averaged Reynolds shear stress contribution to the friction velocity, neglecting any dispersive stress component inherently present from the lateral spat...
Characterization of the Surface Energy Balance Residual in Complex Terrain [0.03%]
复杂地形下表面能量平衡残差的特征分析
Martina Destro,Mathias W Rotach,Manuela Lehner
Martina Destro
The closure of the surface energy balance (SEB) in complex terrain remains a persistent challenge. We present a multi-site analysis based on the i-Box network in the Inn Valley, Austria, to characterize the SEB residual (Res) normalized by ...
Neutral Boundary Layer Urban Dispersion in Scaled Uniform and Nonuniform Residential Building Arrays [0.03%]
均匀与非均匀住宅楼群情景下中性大气边界层城区扩散数值模拟研究
Jonathan Retter,David Heist,R Chris Owen et al.
Jonathan Retter et al.
Dispersion within idealized urban environments was studied in a simulated neutrally buoyant, 1:200 scale boundary layer with the Meteorological Wind Tunnel at the EPA's Fluid Modeling Facility. The measurements are used to offer a baseline ...
Investigating Fire-Atmosphere Interaction in a Forest Canopy Using Wavelets [0.03%]
基于小波理论的森林冠层火气相互作用研究
Ajinkya Desai,Clément Guilloteau,Warren E Heilman et al.
Ajinkya Desai et al.
Wildland fire-atmosphere interaction generates complex turbulence patterns, organized across multiple scales, which inform fire-spread behaviour, firebrand transport, and smoke dispersion. Here, we utilize wavelet-based techniques to explor...
Transfer Efficiency and Organization in Turbulent Transport over Alpine Tundra [0.03%]
阿尔卑斯山苔原上湍流输送的传输效率和组织性
Laura Mack,Terje Koren Berntsen,Nikki Vercauteren et al.
Laura Mack et al.
The exchange of momentum, heat and trace gases between atmosphere and surface is mainly controlled by turbulent fluxes. Turbulent mixing is usually parametrized using Monin-Obukhov similarity theory (MOST), which was derived for steady turb...
Using the Sensible Heat Flux Eddy Covariance-Based Exchange Coefficient to Calculate Latent Heat Flux from Moisture Mean Gradients Over Snow [0.03%]
基于感热通量涡动相关交换系数的雪地显热通量计算方法研究——利用湿度资料估算显热通量的新途径
Sergi González-Herrero,Armin Sigmund,Michael Haugeneder et al.
Sergi González-Herrero et al.
In absence of the high-frequency measurements of wind components, sonic temperature and water vapour required by the eddy covariance (EC) method, Monin-Obukhov similarity theory (MOST) is often used to calculate heat fluxes. However, MOST r...
The Performance of GRAMM-SCI and WRF in Simulating the Surface-Energy Budget and Thermally Driven Winds in an Alpine Valley [0.03%]
GRAMM-SCI和WRF模拟山地山谷的地表能量平衡及热力驱动风的性能分析
Gaspard Simonet,Dietmar Oettl,Manuela Lehner
Gaspard Simonet
Using WRF as a benchmark, GRAMM-SCI simulations are performed for a case study of thermally driven valley- and slope winds in the Inn Valley, Austria. A clear-sky, synoptically undisturbed day was selected when large spatial heterogeneities...
The Performance of a Time-Varying Filter Time Under Stable Conditions over Mountainous Terrain [0.03%]
山区稳定条件下时变滤波器的时间性能分析
Manuela Lehner,Mathias W Rotach
Manuela Lehner
Eddy-covariance data from five stations in the Inn Valley, Austria, are analyzed for stable conditions to determine the gap scale that separates turbulent from large-scale, non-turbulent motions. The gap scale is identified from (co)spectra...