hrvatski

First Analysis of the Jugo Wind Microscale Properties

At the eastern Adriatic coast, there are different types of winds, the most prominent of which are bura and jugo winds. The complex orographic configuration contributes to the frequent occurrence of severe and gusty winds in the area, which is why they are the subject of numerous studies. While bura has been intensively explored for decades, jugo has not received as much attention. Jugo is the wind from southeast, but it can reach bura-like wind speeds and create problems in human activities such as traffic, tourism, infrastructure, agriculture, engineering and firefighting. In this work, the microscale characteristics of the jugo wind are analyzed for the first time. Until now, within the Department of Geophysics of the Faculty of Science in Zagreb, only bura have been studied. The study of jugo turbulence is important because important processes of moisture, momentum and heat transfer in the atmospheric boundary layer take place on this scale as part of the interaction of airflow with the ground. We study a jugo event that was measured near the Maslenica bridge at the beginning of October 2020. We determine the turbulence averaging scale based on Fourier spectra of wind speed components, which allows us to estimate turbulent kinetic energy (TKE) and its dissipation rate (ε). We test the relationship between TKE and ε, and their agreement with the parameterization used in numerical weather prediction models.

Jugo ; kinetička energija turbulecije ; viskozna disipacija

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