Naslov
Mesoscale features in different bora types from the first lidar measurements at Dubrovnik airport

Autori
Jurković, Jadran ; Gabela Šeperić, Lada ; Kos, Igor ; Grisogono, Branko ; Večenaj, Željko Večenaj

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
35th International Conference on Alpine Meteorology (ICAM)

Mjesto i datum
Riva del Garda, Italija, 02.09.2019. - 06.09.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
bora, lidar, Dubrovnik

Sažetak
The bora flow is typical for the lee side of Dinaric Alps, where many international airports are situated. If the wind direction is perpendicular to the runway, as it is the case with bora at the Dubrovnik airport, it can have a significant impact on aviation operations. The impact of the crosswind and wind shear is assesSed within SESAR 2020 programme, in the solution PJ.04-02 - Enhanced Collaborative Airport Performance Management. Lidar measurements were performed during winter 2017/2018. It was the first 3D lidar measurement of bora wind in Croatia. Due to complex terrain and possible different profiles of wind and stability, varieties of flow were expected and measured. Lidar was situated at the slope of the nearby mountain in order to examine and assess the bora flow structure around the airport. During standard bora episodes, horizontal profiles have shown very turbulent flow with sometimes smaller bands parallel to the stream. Vertical profiles confirmed marked jet with heights 0.5- 1.5 km, depending on the range and aerosols concentrations. 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. In the most extreme case found, the maximum horizontal shear of 25 ms-1 radial velocity in just 1km was in case of hydraulic jumps and associated rotor. Lidar profiles in the third bora type, nocturnal gap flow, showed very shallow homogeneous flow which is in accordance with a usual steady measured wind without gusts. From all available profiles, it can be concluded that one of the most turbulent areas around the airport is just in front of the runway R12. Although, to get complete 3D structure more lidar and other observations are needed, for the first time small mesoscale and some turbulent features are confirmed with the measurements during bora.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA