engleski

On the bora turbulence integral length scale at the NE Adriatic coast

In the past decade, a single point horizontal and vertical high frequency wind measurements were conducted at the north-eastern (NE) 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 estimated turbulent kinetic energy, its dissipation rate and integral turbulence length scale (Λ) for bora events in both Senj and Vratnik Pass, but also for the events of wind which has the opposite direction to bora in Vratnik Pass. Atypical behavior of Λ versus the mean wind speed is noticed at borh sites with respect to the wind direction. The question that arises is: what is the cause of this behavior?

Bora; NE Adriatic; Turbulent scales

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