For instance, the replacement of noisy aircraft with low-noise aircraft can simultaneously reduce the area and population exposed to a high noise level, while the optimization of flight procedure can only reduce the population exposed under relatively low noise levels ( 70 ≤ L WECPN ≤ 75 dB). The results indicate that these noise reduction strategies have their own advantages and each of them can serve as an effective noise reduction measure for different applications. The effects of all proposed strategies except for land use planning and sound insulation windows were simulated and analyzed using CadnaA software. In this study, six aircraft noise reduction strategies including the optimization of aircraft type, regulation of night flight number, optimization of flight procedure, modification of operating runway, land use planning and installation of sound insulation windows were proposed to alleviate the harmful impact of aircraft noise on the local area and population near Guangzhou Baiyun International Airport (BIA) in China.
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