Naslov
Turbulence averaging scale for bora flows at the NE Adriatic coast

Autori
Večenaj, Željko ; Belušić, Danijel ; Grisogono, Branko

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

Skup
Davos Atmosphere and Cryosphere Assembly DACA-13

Mjesto i datum
Davos, Švicarska, 08.07.2013. - 12.07.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Bora flows; NE Adriatic; Turbulence scale

Sažetak
At the Eastern Adriatic coast often blows a downslope windstorm called bora. It flows from the north-eastern (NE) quadrant, and it occurs most frequently during winter seasons. Bora mean wind speed can surpass 20 m s-1 and due to its gustiness it occasionally reaches speeds greater than 60 m s-1. During such events, the turbulence is strongly developed in the lee of the mountains ; moreover, sub-mesocale and turbulent structures are additionally complicated at the middle of the NE Adriatic coast due to the upwind and surrounding mountains. In order to investigate turbulence, a suitable time/space averaging scale has to be deployed in order to define turbulent perturbations ; these quantities later on characterize turbulent kinetic energy, gustiness, etc. This study addresses the turbulence averaging scale for bora events recorded by the Gill WindMaster ultrasonic anemometers in the town of Senj (44.99°N, 14.90°E, 2 m above MSL), 13 m above the ground, in the period from March 2004 to June 2006, and Vratnik Pass (44.98°N, 14.98°E, 700 m above MSL), 10 m above the ground in the period from October 2004 to September 2005. Bora events extracted from these periods at both sites are categorized by duration and mean wind speed, which can provide some specific conclusions about the turbulence averaging scale for bora flows.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA