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Naslov:Bora wind, Wind speed vertical profile, Logarithmic law, Power law
Avtorji:ID Bervida, Marija, University of Nova Gorica (Avtor)
ID Stanič, Samo, University of Nova Gorica (Avtor)
ID Bergant, Klemen, University of Nova Gorica,S lovenian Environment Agency (Avtor)
Datoteke:URL http://atmos2018.esa.int/page_session11.php
 
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:Bora is cold and gusty downslope wind with variable gust frequency and duration, appearing on the lee side of Dinaric Alps. Its flow characteristics are unique and theoretically still not fully described, especially for modeling purposes. We present an analysis of the wind speed vertical profiles at Razdrto, which lies in a gap between the Nanos and Javorniki plateau in southwest Slovenia and is strongly exposed to Bora. An analysis of the vertical wind speed profiles during Bora episodes is based on experimental wind data, provided by Helikopter energija, for six Bora events of different duration, appearing between April 2010 and May 2011. Average wind speed in 10-minute intervals was collected at four different heights (20, 31, 40 and 41.7 m above the ground)at the wind turbine site in Razdrto using cup anemometers. Wind direction data with same temporal resolution was obtained from a single wind vane placed at 40.9 m above the ground. Based on the collected data, the applicability of the empirical power-law and the logarithmic law profiles, commonly used for the description of neutrally stratified atmosphere, was investigated for the case of Bora. The parameters for the power-law and logarithmic law were obtained by fitting the wind speed data using linear regression method and are compared to standard values for that particular type of terrain. The quality of fits was very good with r2 above 0.9, indicating that both power-law and logarithmic law adequately describe mean horizontal Bora wind. The median value of the power-law coefficient was found to be 0.16±0.03, which is consistent with standard value for neutral atmosphere (0.143). The aerodynamic roughness varied from 0.003 m to 0.22 m with the median value of 0.09±0.07, which describes open level country terrain with some trees. The event in November 2010 with large roughness is expected to be due to specific wind direction and surface conditions.
Ključne besede:Bora wind, Wind speed vertical profile, Logarithmic law, Power law
Status publikacije:Objavljeno
Leto izida:2018
PID:20.500.12556/RUNG-4387-581a5b64-ba53-f371-5fd9-ea8b692f3293 Novo okno
COBISS.SI-ID:5326331 Novo okno
NUK URN:URN:SI:UNG:REP:NISKTLXV
Datum objave v RUNG:07.02.2019
Število ogledov:5560
Število prenosov:29
Metapodatki:XML DC-XML DC-RDF
:
BERVIDA, Marija, STANIČ, Samo in BERGANT, Klemen, 2018, Bora wind, Wind speed vertical profile, Logarithmic law, Power law. V : ATMOS 2018 [na spletu]. Objavljeni znanstveni prispevek na konferenci. Salzburg. 2018. [Dostopano 10 april 2025]. Pridobljeno s: http://atmos2018.esa.int/page_session11.php
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Naslov:ATMOS 2018
Kraj izida:Salzburg
Leto izida:2018

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