Journal of Guangdong University of Technology ›› 2024, Vol. 41 ›› Issue (05): 72-79.doi: 10.12052/gdutxb.230058

• Environmental Science & Engineering • Previous Articles     Next Articles

Applicability Test of a Diagnostic Equation for Daily Maximum Urban Heat Island Intensity Considering Anthropogenic Heat Flux

Chen Yi-qi1, Tan Xiao1, He Hao1, Li Nan2, Chen Guang1, Cai Yun-nan1   

  1. 1. School of Architecture and Urban Planning, Guangdong University of Technology, Guangzhou 510090, China;
    2. Green Building Design Research Center, Architectural Design and Research Institute of Guangdong Province, Guangzhou 510000, China
  • Received:2023-04-07 Online:2024-09-25 Published:2024-09-27

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Abstract: The urban heat island (UHI) has a significant impact on thermal comfort, energy, and ecological security. Accurately predicting the daily maximum urban heat island intensity (UHIImax) can provide early warning for energy consumption and ensure outdoor thermal safety. Based on the local climate zone (LCZ) framework, multiple LCZs were selected in Guangzhou, and long-term local climate observations were conducted over three years. The applicability of a diagnostic equation for daily UHIImax proposed by a European scholar, which did not consider anthropogenic heat flux (AHF) , was validated based on the observed results. Furthermore, the applicability of a revised equation considering AHF was tested in Guangzhou. The results showed that the diagnostic accuracy of the original equation was acceptable, with a correlation coefficient r2 of 0.63, Root Mean Square Error (RMSE) of 1.50 K, Median Absolute Error (MEAE) of 0.97 K and d of 0.60. The revised equation considering AHF yielded more accurate diagnostic results than the original equation, with a decrease of 0.12 K in RMSE, a decrease of 0.10 K in MEAE, and an increase of 0.04 in d. The differences in the validation results of the equation across different LCZs indicate that the equation should be modified according to the characteristics of each LCZ. However, incorporating AHF can improve the diagnostic performance of the equation in all LCZs. In conclusion, the revised equation can be used to predict the development of UHI and improve diagnostic accuracy in hot and humid cities.

Key words: daily maximum urban heat island intensity, diagnostic equation, local climate zone, equation evaluation, anthropogenic heat flux

CLC Number: 

  • TU986
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