engleski

On the turbulence integral scales for the bora flows at the NE Adriatic coast

Single point 3D high frequency wind measurements were conducted at the north-eastern Adriatic coast in the town of Senj (44.99°N, 14.90°E, 2 m above MSL, 13 m above the ground, March 2004 – June 2006), and Vratnik Pass (44.98°N, 14.98°E, 700 m above MSL, 10 m above the ground, Oct. 2004 – Sep. 2005), using WindMaster ultrasonic anemometers (Gill Instruments). These instruments recorded the data with a sampling frequency of 4 Hz. They were continuously operational for more than two years in Senj and almost a year in Vratnik Pass, recording all kinds of airflows. Using these data sets, we have a great opportunity to investigate turbulence characteristics of the local wind in this region. We estimate turbulent kinetic energy and its dissipation rate for bora events in both Senj and Vratnik Pass between the coastal mountains. Using these estimations, we estimate integral turbulence length scale and integral turbulence time scale (a total eddy lifetime) through the turbulence closure techniques. The relationships between these scales and turbulence dissipation scales are investigated and compared with the relationships already reported in the literature. Among other reasons, these quantities are important for numerical model evaluations and turbulence parameterization scheme improvements.

Bora flows; Adriatic Sea; Integral scales

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