scholarly journals Detection of Complex Terrain-Induced Wind Shear by Doppler Lidar at Beijing Capital International Airport

2020 ◽  
Vol 237 ◽  
pp. 06004
Author(s):  
Xiaoying Liu ◽  
Songhua Wu ◽  
Hongwei Zhang ◽  
Jianjun Zhang ◽  
Zhiqiang He ◽  
...  
Keyword(s):  
Wind Field ◽  
Complex Terrain ◽  
Wind Shear ◽  
Field Structure ◽  
Shielding Effect ◽  
Doppler Lidar ◽  
Wake Effect ◽  
International Airport ◽  
Glide Path ◽  
Coherent Doppler Lidar

In November 2018, the lidar-based wind shear synchronous experiment was performed at Beijing Capital International Airport (BCIA). In this experiment, aiming at the measurement of the terrain-induced wind shear and the wind field around the runway, the glide path scanning mode, and the RHI strategy were conducted alternately. Radial velocity retrieved from the glide path scanning can obviously present the wakes caused by complex terrain (e.g., hills, tall trees, residential and terminal buildings). The Pulse Coherent Doppler Lidar (PCDL) warned the terrain-induced wind shear, which was verified by the pilot report. The wind field structure around the runway under the wake effect and the building shielding effect is also analyzed.

scholarly journals Airport low-level wind shear lidar observation at beijing capital international airport

2018 ◽  
Vol 176 ◽  
pp. 06013
Author(s):  
Hongwei Zhang ◽  
Songhua Wu ◽  
Qichao Wang ◽  
Bingyi Liu ◽  
Xiaochun Zhai
Keyword(s):  
Wind Shear ◽  
Doppler Lidar ◽  
Low Level ◽  
Lidar Observation ◽  
International Airport ◽  
Glide Path ◽  
Coherent Doppler Lidar

Ocean University of China lidar team operated a pulse coherent Doppler lidar (PCDL) for the low level wind shear monitoring at the Beijing Capital International Airport (BCIA) in 2015. The experiment configuration, observation modes is presented. A case study shows that the low level wind shear events at the southern end of 18R/36L runway were mainly caused by the trees and buildings along the glide path under strong northwest wind conditions.

scholarly journals Low-Level Wind Shear Identification along the Glide Path at BCIA by the Pulsed Coherent Doppler Lidar

Atmosphere ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 50
Author(s):  
Hongwei Zhang ◽  
Xiaoying Liu ◽  
Qichao Wang ◽  
Jianjun Zhang ◽  
Zhiqiang He ◽  
...  
Keyword(s):  
Wind Shear ◽  
Vertical Direction ◽  
Small Scale ◽  
Observation Data ◽  
Doppler Lidar ◽  
Low Level ◽  
Glide Path ◽  
Coherent Doppler Lidar ◽  
Scanning Strategies ◽  
Meteorological Phenomenon

Low-level wind shear is usually to be a rapidly changing meteorological phenomenon that cannot be ignored in aviation security service by affecting the air speed of landing and take-off aircrafts. The lidar team in Ocean University of China (OUC) carried out the long term particular researches on the low-level wind shear identification and regional wind shear inducement search at Beijing Capital International Airport (BCIA) from 2015 to 2020 by operating several pulsed coherent Doppler lidar (PCDL) systems. On account of the improved glide path scanning strategy and virtual multiple wind anemometers based on the rang height indicator (RHI) modes, the small-scale meteorological phenomenon along the glide path and/or runway center line direction can be captured. In this paper, the device configuration, scanning strategies, and results of the observation data are proposed. The algorithms to identify the low-level wind shear based on the reconstructed headwind profiles data have been tested and proved based on the lidar data obtained from December 2018 to January 2019. High spatial resolution observation data at vertical direction are utilized to study the regional wind shear inducement at the 36L end of BCIA under strong northwest wind conditions.

Wind-Field Vector Retrieval Method at Low Signal-to-Noise Ratio for Coherent Doppler Lidar

2018 ◽  
Vol 45 (11) ◽  
pp. 1110005
Author(s):  
赵萌 Zhao Meng ◽  
郭磐 Guo Pan ◽  
芮训豹 Rui Xunbao ◽  
陈思颖 Chen Siying ◽  
张寅超 Zhang Yinchao ◽  
...  
Keyword(s):  
Wind Field ◽  
Signal To Noise Ratio ◽  
Field Vector ◽  
Doppler Lidar ◽  
Signal To Noise ◽  
Retrieval Method ◽  
Coherent Doppler Lidar ◽  
Noise Ratio ◽  
Vector Retrieval

scholarly journals Applications of an Infrared Doppler Lidar in Detection of Wind Shear

2008 ◽  
Vol 25 (5) ◽  
pp. 637-655 ◽  
Author(s):  
C. M. Shun ◽  
P. W. Chan
Keyword(s):  
Hong Kong ◽  
Wind Shear ◽  
Spatial And Temporal Variability ◽  
Doppler Lidar ◽  
Glide Path ◽  
Alerting System ◽  
Hong Kong International Airport ◽  
Detection Technologies ◽  
Gust Front ◽  
Glide Paths

Abstract In December 2005, operational wind shear alerting at the Hong Kong International Airport (HKIA) reached an important milestone with the launch of the automatic Lidar (light detection and ranging) Windshear Alerting System (LIWAS). This signifies that the anemometer-based and radar-based wind shear detection technologies deployed worldwide in the twentieth century have been further advanced by the addition of the lidar—a step closer to all-weather coverage. Unlike the microburst and gust front, which have a well-defined coherent vertical structure in the lowest several hundred meters of the atmosphere, terrain-induced wind shear tends to have high spatial and temporal variability. To detect the highly changeable winds to be encountered by the aircraft under terrain-induced wind shear situations, the Hong Kong Observatory devises an innovative glide path scan (GPScan) strategy for the lidar, pointing the laser beam toward the approach and departure glide paths, with the changes in azimuth and elevation angles concerted. The purpose of the GPScans is to derive the headwind profiles and hence the wind shear along the glide paths. Developed based on these GPScans, LIWAS is able to capture about 76% of the wind shear events reported by pilots over the most-used approach corridor under clear-air conditions. During the past two years, further developments of the lidar took place at HKIA, including the use of runway-specific lidar to further enhance the wind shear detection performance.

Coherent Doppler Lidar Measurements of Wind Field Statistics

1998 ◽  
Vol 86 (2) ◽  
pp. 233-256 ◽  
Author(s):  
Rod Frehlich ◽  
Stephen M. Hannon ◽  
Sammy W. Henderson
Keyword(s):  
Wind Field ◽  
Doppler Lidar ◽  
Coherent Doppler Lidar ◽  
Lidar Measurements

Numerical simulation and inversion validation of the real correlation random wind field generation for coherent Doppler LiDAR

Optik ◽  
2014 ◽  
Vol 125 (18) ◽  
pp. 5369-5373
Author(s):  
Zhichao Bu ◽  
Siying Chen ◽  
Yinchao Zhang ◽  
He Chen ◽  
Xianying Ge ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Wind Field ◽  
Doppler Lidar ◽  
The Real ◽  
Field Generation ◽  
Coherent Doppler Lidar ◽  
And Inversion

scholarly journals Characterization of aircraft dynamic wake vortices and atmospheric turbulence by coherent doppler lidar

2018 ◽  
Vol 176 ◽  
pp. 06001 ◽  
Author(s):  
Songhua Wu ◽  
Xiaochun Zhai ◽  
Bingyi Liu ◽  
Jintao Liu
Keyword(s):  
Atmospheric Turbulence ◽  
Temporal Evolution ◽  
Ground Effect ◽  
Doppler Lidar ◽  
Wake Vortices ◽  
International Airport ◽  
Coherent Doppler Lidar ◽  
Evolution Characteristics ◽  
Key Characteristics

Field observations for the wake vortices by Coherent Doppler Lidar (CDL) have been carried out at the Beijing Capital International Airport (BCIA) and Tianjin Binhai International Airport (TBIA) to investigate the wake vortices evolution characteristics and the near-ground effect. This paper introduces the dynamic wake vortices and atmospheric turbulence monitoring technique, successfully demonstrating that the CDL can capture the key characteristics of wake vortices in real-time, including wake vortices intensity, spatial-temporal evolution and so forth.

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