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* old and bolonia study programme


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Synthetic generation of the atmospheric boundary layer for wind loading assessment using spectral methods
Stefano de Miranda, Luca Patruno, Samo Stanič, Marija Bervida, 2020, original scientific article

Found in: ključnih besedah
Summary of found: ...Homogeneous turbulence, Synthetic turbulence, Atmospheric boundary layer, LES, Inflow...
Keywords: Homogeneous turbulence, Synthetic turbulence, Atmospheric boundary layer, LES, Inflow conditions
Published: 09.01.2020; Views: 1776; Downloads: 0
.pdf Fulltext (4,87 MB)

Gravity wave instability structures and turbulence from more than 1.5 years of OH[ast] airglow imager observations in Slovenia
Samo Stanič, Sabine Wüst, Michael Bittner, Carsten Schmidt, René Sedlak, Patrick Hannawald, 2021, original scientific article

Abstract: We analyzed 286 nights of data from the OH* airglow imager FAIM 3 (Fast Airglow IMager) acquired at Otlica Observatory, Slovenia, between 26 October 2017 and 6 June 2019. Measurements were performed with a spatial resolution of 24 m per pixel and a temporal resolution of 2.8 s. Multiple turbulence episodes were observed and the energy dissipation rate in the upper mesosphere/lower thermosphere region was estimated from image sequences in 25 cases. Values range around 0.08 and 9.03 W/kg and would lead to an approximated localized maximum heating of 0.03–3.02 K per turbulence event.
Found in: ključnih besedah
Keywords: upper mesosphere, lower thermosphere, remote sensing, gravity waves, turbulence, Bora episodes
Published: 25.10.2021; Views: 542; Downloads: 0
.pdf Fulltext (2,08 MB)

Bora flow characteristics in a complex valley environment
Xiaoquan Song, Klemen Bergant, Longlong Wang, Griša Močnik, Samo Stanič, Marija Bervida, 2021, original scientific article

Abstract: This paper complements the existing studies of Bora flow properties in the Vipava valley with the study of Bora turbulence in a lower region of the troposphere. The turbulence characteristics of Bora flow were derived from high resolution Doppler wind lidar measurements during eight Bora wind episodes that occurred in November and December 2019. Based on the vertical profiles of wind velocity, from 80 to 180 m above the valley floor, the turbulence intensity related to all three spatial directions and the along-wind integral length scales related to three velocity components were evaluated and compared to the approximations given in international standards. The resulting turbulence characteristics of Bora flow in a deep mountain valley exhibited interesting behaviour, differing from the one expected and suggested by standards. The intensity of turbulence during Bora episodes was found to be quite strong, especially regarding the expected values for that particular category of terrain. The specific relationship between along-wind, lateral and vertical intensity was evaluated as well. The scales of turbulence in the along-wind direction were found to vary widely between different Bora episodes and were rather different from the approximations given by standards, with the most significant deviations observed for the along-wind length scale of the vertical velocity component. Finally, the periodicity of flow structures above the valley was assessed, yielding a wide range of possible periods between 1 and 10 min, thus confirming some of the previous observations from the studies of Bora in the Vipava valley.
Found in: ključnih besedah
Summary of found: ...Vipava valley with the study of Bora turbulence in a lower region of the troposphere....
Keywords: doppler wind lidar, Bora wind, turbulence intensity, complex terrain, turbulence integral length scale
Published: 05.11.2021; Views: 555; Downloads: 14
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