| Author: | Zhu, Xiao-yu |
| Title: | Characterization of turbulence in urban wind environment |
| Degree: | M.Eng. |
| Year: | 2020 |
| Subject: | Winds Urban climatology Atmospheric turbulence Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Building Services Engineering |
| Pages: | vi, 121 pages : color illustrations |
| Language: | English |
| Abstract: | The wind environment in the urban area will affect the environmental pollution and citizens' perception of thermal comfort, which has an important impact on citizens' living standards. In such a high density and subtropical area as Hong Kong, it is of great significance to study the characterization of urban wind environment and to explore the methods to improve it for the outdoor thermal comfort. The wind in the urban will produce different vortex due to the underlying surface, architectural layout, morphology and meteorological environment, which will be shown in the form of turbulence. In this study, the characterization of turbulence in urban wind environment are studied by on-site measurement method, and the influence of turbulence on outdoor thermal comfort is understood. Four typical building layouts (glass site, open site, UEB site and tree site) are selected in the campus of the Hong Kong Polytechnic University, and 24-hour field measurement is carried out. Based on the measurement of meteorological parameters (wind speed, air temperature, relative humidity and black globe temperature), the average wind speed and turbulence intensity are calculated and analyzed to characterize the urban wind environment. The short-term wind speed is simulated and predicted by combining wavelet transformation with ARIMA model. The influence of turbulence intensity on human thermal comfort is discussed. The results show that the average wind speed and turbulence characterization of urban wind environment are obviously affected by the building layout. ARIMA model combined with wavelet processing can also simulate short-term wind speed well. Finally, by analyzing the relationship between turbulence intensity and thermal comfort index PET, it is found that turbulence intensity has influence on thermal comfort, and the thermal comfort predicted by PET seems more sensitive to the effects of turbulence intensity under strong solar radiation. The results can provide recommendations for improving urban wind environment and outdoor thermal comfort. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 5353.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.71 MB | Adobe PDF | View/Open |
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