engleski

Small mesoscale features during bora at Dubrovnik airport

Bora wind could strongly affect the safety of air traffic operations especially if its direction is perpendicular to the runway direction as is the case at Dubrovnik airport. Influence of the crosswind and wind shear on air traffic is examined within SESAR 2020 programme, in the solution PJ.04-02 – Enhanced Collaborative Airport Performance Management. In order to obtain flow structure, lidar measurements were performed during winter 2017/2018. These were first 3D lidar measurements of bora wind in Croatia. Owing to the complex terrain surroundings and possible different profiles of wind and stability, varieties of flow were expected and measured. We present several cases of 3D lidar measurements of the bora flow focusing on the small mesoscale features. Generally, violent bora episodes with high wind speeds measured at the airport show flow structure with strong turbulence and sometimes with a hydraulic jump. These are so-called shallow bora episodes. In case of deep bora layer, a broad area of north- east wind flow is measured, but with small moving patches of high wind speed with strong turbulence near the airport. Moreover, during one episode of bora which lasted for 30 hours, several different wind regimes were found. After all, measurements confirmed that one of the most turbulent areas in surroundings of the airport is located just before the landing at preferred runway RWY12.

bora, airport Dubrovnik, mesoscale features

nije evidentirano