Bora Flow Characteristics in a Complex Valley Environment

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 episod...

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Autores principales:	Marija Bervida, Samo Stanič, Griša Močnik, Longlong Wang, Klemen Bergant, Xiaoquan Song
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Doppler wind lidar Bora wind turbulence intensity complex terrain turbulence integral length scale Science Q
Acceso en línea:	https://doaj.org/article/c37f597769d5439da34e528f709e1462
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spelling	oai:doaj.org-article:c37f597769d5439da34e528f709e14622021-11-11T18:54:49ZBora Flow Characteristics in a Complex Valley Environment10.3390/rs132143632072-4292https://doaj.org/article/c37f597769d5439da34e528f709e14622021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4363https://doaj.org/toc/2072-4292This 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.Marija BervidaSamo StaničGriša MočnikLonglong WangKlemen BergantXiaoquan SongMDPI AGarticleDoppler wind lidarBora windturbulence intensitycomplex terrainturbulence integral length scaleScienceQENRemote Sensing, Vol 13, Iss 4363, p 4363 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Doppler wind lidar Bora wind turbulence intensity complex terrain turbulence integral length scale Science Q
spellingShingle	Doppler wind lidar Bora wind turbulence intensity complex terrain turbulence integral length scale Science Q Marija Bervida Samo Stanič Griša Močnik Longlong Wang Klemen Bergant Xiaoquan Song Bora Flow Characteristics in a Complex Valley Environment
description	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.
format	article
author	Marija Bervida Samo Stanič Griša Močnik Longlong Wang Klemen Bergant Xiaoquan Song
author_facet	Marija Bervida Samo Stanič Griša Močnik Longlong Wang Klemen Bergant Xiaoquan Song
author_sort	Marija Bervida
title	Bora Flow Characteristics in a Complex Valley Environment
title_short	Bora Flow Characteristics in a Complex Valley Environment
title_full	Bora Flow Characteristics in a Complex Valley Environment
title_fullStr	Bora Flow Characteristics in a Complex Valley Environment
title_full_unstemmed	Bora Flow Characteristics in a Complex Valley Environment
title_sort	bora flow characteristics in a complex valley environment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c37f597769d5439da34e528f709e1462
work_keys_str_mv	AT marijabervida boraflowcharacteristicsinacomplexvalleyenvironment AT samostanic boraflowcharacteristicsinacomplexvalleyenvironment AT grisamocnik boraflowcharacteristicsinacomplexvalleyenvironment AT longlongwang boraflowcharacteristicsinacomplexvalleyenvironment AT klemenbergant boraflowcharacteristicsinacomplexvalleyenvironment AT xiaoquansong boraflowcharacteristicsinacomplexvalleyenvironment
_version_	1718431669731459072

Bora Flow Characteristics in a Complex Valley Environment

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