Measurements and Modelling of the Wind Speed Profile in the Marine Atmospheric Boundary Layer

2008 ◽  
Vol 129 (3) ◽  
pp. 479-495 ◽  
Author(s):  
Alfredo Peña ◽  
Sven-Erik Gryning ◽  
Charlotte B. Hasager
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Atmospheric Boundary Layer ◽  
Speed Profile ◽  
Marine Atmospheric Boundary Layer ◽  
Wind Speed Profile

scholarly journals Revisiting the Definition of the Drag Coefficient in the Marine Atmospheric Boundary Layer

2010 ◽  
Vol 40 (10) ◽  
pp. 2325-2332 ◽  
Author(s):  
Richard J. Foreman ◽  
Stefan Emeis
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Atmospheric Boundary Layer ◽  
Drag Coefficient ◽  
Friction Velocity ◽  
Marine Boundary Layer ◽  
Marine Atmospheric Boundary Layer ◽  
Wind Speeds ◽  
Traditional Definition ◽  
Definition Of

Abstract A new functional form of the neutral drag coefficient for moderate to high wind speeds in the marine atmospheric boundary layer for a range of field measurements as reported in the literature is proposed. This new form is found to describe a wide variety of measurements recorded in the open ocean, coast, fetch-limited seas, and lakes, with almost one and the same set of parameters. This is the result of a reanalysis of the definition of the drag coefficient in the marine boundary layer, which finds that a constant is missing from the traditional definition of the drag coefficient. The constant arises because the neutral friction velocity over water surfaces is not directly proportional to the 10-m wind speed, a consequence of the transition to rough flow at low wind speeds. Within the rough flow regime, the neutral friction velocity is linearly dependent on the 10-m wind speed; consequently, within this rough regime, the new definition of the drag coefficient is not a function of the wind speed. The magnitude of the new definition of the neutral drag coefficient represents an upper limit to the magnitude of the traditional definition.

The Influence of Thermal Effects on the Wind Speed Profile of the Coastal Marine Boundary Layer

2004 ◽  
Vol 112 (3) ◽  
pp. 587-617 ◽  
Author(s):  
Bernhard Lange ◽  
Søren Larsen ◽  
Jørgen Højstrup ◽  
Rebecca Barthelmie
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Thermal Effects ◽  
Marine Boundary Layer ◽  
Speed Profile ◽  
Wind Speed Profile ◽  
Coastal Marine

scholarly journals Length Scales of the Neutral Wind Profile over Homogeneous Terrain

2010 ◽  
Vol 49 (4) ◽  
pp. 792-806 ◽  
Author(s):  
Alfredo Peña ◽  
Sven-Erik Gryning ◽  
Jakob Mann ◽  
Charlotte B. Hasager
Keyword(s):  
Boundary Layer ◽  
Surface Layer ◽  
Wind Speed ◽  
Wind Profile ◽  
Mixing Length ◽  
Speed Profile ◽  
Wind Speed Profile ◽  
Length Scales ◽  
Spectral Models ◽  
Good Agreement

Abstract The wind speed profile for the neutral boundary layer is derived for a number of mixing-length parameterizations, which account for the height of the boundary layer. The wind speed profiles show good agreement with the reanalysis of the Leipzig wind profile (950 m high) and with combined cup–sonic anemometer and lidar measurements (300 m high) performed over flat and homogeneous terrain at Høvsøre, Denmark. In the surface layer, the mixing-length parameterizations agree well with the traditional surface-layer theory, but the wind speed profile is underestimated when the surface-layer scaling is extended to the entire boundary layer, demonstrating the importance of the boundary layer height as a scaling parameter. The turbulence measurements, performed up to 160-m height only at the Høvsøre site, provide the opportunity to derive the spectral-length scales from two spectral models. Good agreement is found between the behaviors of the mixing- and spectral-length scales.

Evaluation of parametric laws for computing the wind speed profile in the urban boundary layer: comparison to two-dimensional building water channel data

2018 ◽  
Vol 64 (1/2/3) ◽  
pp. 4
Author(s):  
Annalisa Di Bernardino ◽  
Armando Pelliccioni ◽  
Paolo Monti ◽  
Giovanni Leuzzi ◽  
Giorgio Querzoli
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Water Channel ◽  
Urban Boundary Layer ◽  
Two Dimensional ◽  
Speed Profile ◽  
Wind Speed Profile
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