Comparision of the NCEP/NCAR Reanalysis II winds with those observed over a complex terrain in lower atmospheric boundary layer

2009 ◽  
Vol 36 (1) ◽  
Author(s):  
M. Shravan Kumar ◽  
V. K. Anandan
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Complex Terrain

Effects From Complex Terrain on Wind-Turbine Performance

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Ann Hyvärinen ◽  
Antonio Segalini
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Wind Turbine ◽  
Complex Terrain ◽  
Positive Impact ◽  
Interaction Effects ◽  
Turbine Performance ◽  
Turbulent Inflow ◽  
Wake Interaction ◽  
Inflow Conditions

In this work, experimental measurements are made to study wind turbines over complex terrains and in presence of the atmospheric boundary layer. Thrust and power coefficients for single and multiple turbines are measured when introducing sinusoidal hills and spires inducing an artificial atmospheric boundary layer. Additionally, wake interaction effects are studied, and inflow velocity profiles are characterized using hot-wire anemometry. The results indicate that the introduced hills have a positive impact on the wind-turbine performance and that wake-interaction effects are significantly reduced during turbulent inflow conditions.

scholarly journals Observations of the thermodynamic and kinematic state of the atmospheric boundary layer over the San Luis Valley, CO, using the CopterSonde 2 remotely piloted aircraft system in support of the LAPSE-RATE field campaign

2021 ◽  
Vol 13 (2) ◽  
pp. 269-280
Author(s):  
Elizabeth A. Pillar-Little ◽  
Brian R. Greene ◽  
Francesca M. Lappin ◽  
Tyler M. Bell ◽  
Antonio R. Segales ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Complex Terrain ◽  
Lapse Rate ◽  
San Luis Valley ◽  
University Of Oklahoma ◽  
San Luis ◽  
Remotely Piloted Aircraft ◽  
Aircraft System ◽  
Convection Initiation

Abstract. In July 2018, the University of Oklahoma deployed three CopterSonde remotely piloted aircraft systems (RPASs) to take measurements of the evolving thermodynamic and kinematic state of the atmospheric boundary layer (ABL) over complex terrain in the San Luis Valley, Colorado. A total of 180 flights were completed over 5 d, with teams operating simultaneously at two different sites in the northern half of the valley. A total of 2 d of operations focused on convection initiation studies, 1 d focused on ABL diurnal transition studies, 1 d focused on internal comparison flights, and the last day of operations focused on cold air drainage flows. The data from these coordinated flights provide insight into the horizontal heterogeneity of the atmospheric state over complex terrain. This dataset, along with others collected by other universities and institutions as a part of the LAPSE-RATE campaign, have been submitted to Zenodo (Greene et al., 2020) for free and open access (https://doi.org/10.5281/zenodo.3737087).

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