Title: Wind Turning in The Atmospheric Boundary Layer
Abstract: Measurements at Hovsore site in Denmark are used to analyse the change with height of wind speed and the
turning of the wind in the atmospheric boundary layer. The purpose is to study the behaviour of wind turning
and wind shear and analyse the relations between them.
The study will show the effect of wide range of stability classes on the turning of wind and wind speed
by combining cup, wind vane and sonic at meteorological mast with lidar observations. Easterly wind is
investigated at Hovsore site to study the behaviour of the overland wind shear and wind turning from November
2008 to April 2009. In this study, data are analysed based on average 10-min wind speeds and wind directions
diurnal, monthly and during the whole period of measurements.
The results show that first, the wind speed profile of meteorological mast and lidar are in agreement to
different stability classes. Second, the wind direction profile changes with height reasonable in all stability
conditions except in very unstable and unstable cases. Third result shows that the wind shear and the wind
turning are unstable during the day and stable during the night in the average whole period of six months.
Fourth, the yearly wind turning and wind shear are in agreement without considering lidar observations. They
behave also in similar way when lidar observations combine with meteorological mast. In conclusion, the
comparisons between the wind shear and the turning of the wind with and without considering lidar observation
show that the wind shear is in the agreement with the wind turning.
The second result on this study was unexpected. The reason for this behaviour may be explained as the
number of measurements are very low. Another reason is that the value of heat
fluxes are low, whereas they
have to be high. The last reason might be related to a baroclinicity.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: dissertation
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