Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”

The Doppler Lidar windshear alerting system at the Hong Kong International Airport (HKIA), the first of its kind in the world, has been in operation since 2006. This paper reports on an enhancement to the automatic windshear detection algorithm at HKIA, which aims at filtering out alerts associated...

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Autores principales:	Kai Kwong Hon, Pak Wai Chan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Lidar wind shear turbulence airport Hong Kong boundary layer Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/b42d5c02761d4ba39039f65479300f21
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id	oai:doaj.org-article:b42d5c02761d4ba39039f65479300f21
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spelling	oai:doaj.org-article:b42d5c02761d4ba39039f65479300f212021-11-25T16:46:00ZImproving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”10.3390/atmos121115392073-4433https://doaj.org/article/b42d5c02761d4ba39039f65479300f212021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4433/12/11/1539https://doaj.org/toc/2073-4433The Doppler Lidar windshear alerting system at the Hong Kong International Airport (HKIA), the first of its kind in the world, has been in operation since 2006. This paper reports on an enhancement to the automatic windshear detection algorithm at HKIA, which aims at filtering out alerts associated with smoother headwind changes spread over longer distances along the aircraft glide path (called “gentle ramps”) which may nonetheless exceed the well-established alerting threshold. Real-time statistics are examined over a 46-month study period between March 2016 and December 2019, covering a total of 2,017,440 min and over 1500 quality-controlled pilot reports of windshear (PIREP). The “gentle ramp removal” (GRR) function is able to effectively cut down the alert duration over the 5 major runway corridors, inclusive of both landing and take-off, which together account for over 98% of the PIREP received at HKIA during the study period. In all 5 runway corridors this is achieved with a proportionately smaller decrease—even with no changes in 2 cases—in the hit rate, highlighting the efficiency of the GRR function. The difference in statistical behaviour across the runway corridors also echo literature findings about the differences in length scale of wind disturbances at different locations within HKIA. This study serves as a unique documentation of the state-of-the-art in operational Lidar windshear detection and can provide useful reference to airports and aviation meteorologists around the world.Kai Kwong HonPak Wai ChanMDPI AGarticleLidarwind shearturbulenceairportHong Kongboundary layerMeteorology. ClimatologyQC851-999ENAtmosphere, Vol 12, Iss 1539, p 1539 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Lidar wind shear turbulence airport Hong Kong boundary layer Meteorology. Climatology QC851-999
spellingShingle	Lidar wind shear turbulence airport Hong Kong boundary layer Meteorology. Climatology QC851-999 Kai Kwong Hon Pak Wai Chan Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”
description	The Doppler Lidar windshear alerting system at the Hong Kong International Airport (HKIA), the first of its kind in the world, has been in operation since 2006. This paper reports on an enhancement to the automatic windshear detection algorithm at HKIA, which aims at filtering out alerts associated with smoother headwind changes spread over longer distances along the aircraft glide path (called “gentle ramps”) which may nonetheless exceed the well-established alerting threshold. Real-time statistics are examined over a 46-month study period between March 2016 and December 2019, covering a total of 2,017,440 min and over 1500 quality-controlled pilot reports of windshear (PIREP). The “gentle ramp removal” (GRR) function is able to effectively cut down the alert duration over the 5 major runway corridors, inclusive of both landing and take-off, which together account for over 98% of the PIREP received at HKIA during the study period. In all 5 runway corridors this is achieved with a proportionately smaller decrease—even with no changes in 2 cases—in the hit rate, highlighting the efficiency of the GRR function. The difference in statistical behaviour across the runway corridors also echo literature findings about the differences in length scale of wind disturbances at different locations within HKIA. This study serves as a unique documentation of the state-of-the-art in operational Lidar windshear detection and can provide useful reference to airports and aviation meteorologists around the world.
format	article
author	Kai Kwong Hon Pak Wai Chan
author_facet	Kai Kwong Hon Pak Wai Chan
author_sort	Kai Kwong Hon
title	Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”
title_short	Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”
title_full	Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”
title_fullStr	Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”
title_full_unstemmed	Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”
title_sort	improving lidar windshear detection efficiency by removal of “gentle ramps”
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b42d5c02761d4ba39039f65479300f21
work_keys_str_mv	AT kaikwonghon improvinglidarwindsheardetectionefficiencybyremovalofgentleramps AT pakwaichan improvinglidarwindsheardetectionefficiencybyremovalofgentleramps
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Improving Lidar Windshear Detection Efficiency by Removal of “Gentle Ramps”

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