Measurement of turbulence in terrain-disrupted airflow at the Hong Kong International Airport using a Doppler LIDAR
| Autor: | Pak Wai Chan, Lai, K. K., Shun, C. M. |
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| Zdroj: | Scopus-Elsevier Hrvatski meteorološki časopis Volume 40 Issue 40 |
| ISSN: | 1330-0083 1849-0700 |
| Popis: | The Doppler LIDAR of the Hong Kong Observatory was used to measure eddy dissipation rate (EDR) directly for the first time at the Hong Kong International Airport in an experiment in 2004. EDR is a measure of turbulence intensity adopted by the International Civil Aviation Organization. The laser beam of the LIDAR stared in a direction parallel to the runways and radial velocity data were obtained at a range resolution of 60 m. The velocity structure function was computed based on two different estimates of the velocity fluctuation (viz. temporal and spatial methods) and EDR was then calculated by fitting the structure function with the von Kármán model. The two estimates of velocity fluctuation were found to give comparable EDR values. The LIDAR-derived EDR also turned out to have good correlation with EDR obtained from runway anemometers and a boundary-layer wind profiler. In a case of terrain-disrupted airflow during the experiment, the LIDAR-derived EDR showed that turbulence was present near the centre of a micro-scale vortex to the west of the airport. |
| Databáze: | OpenAIRE |
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