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 SizeFormat 
5353.pdfFor All Users (off-campus access for PolyU Staff & Students only)3.71 MBAdobe PDFView/Open

Copyright Undertaking

As a bona fide Library user, I declare that:

  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.

By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

Show full item record

Please use this identifier to cite or link to this item: