Urban design factors influencing heat island intensity in high-rise high-density environments of Hong Kong

2007 ◽  
Vol 42 (10) ◽  
pp. 3669-3684 ◽  
Author(s):  
R. Giridharan ◽  
S.S.Y. Lau ◽  
S. Ganesan ◽  
B. Givoni
Keyword(s):  
Hong Kong ◽  
Urban Design ◽  
High Density ◽  
Heat Island ◽  
High Rise ◽  
Factors Influencing ◽  
Design Factors

scholarly journals Urban Design Factors Influencing Surface Urban Heat Island in the High-Density City of Guangzhou Based on the Local Climate Zone

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3459 ◽  
Author(s):  
Yurong Shi ◽  
Yirui Xiang ◽  
Yufeng Zhang
Keyword(s):  
Urban Design ◽  
Land Surface ◽  
High Density ◽  
Heat Island ◽  
Local Climate ◽  
Factors Influencing ◽  
Urban Heat ◽  
Surface Urban Heat Island ◽  
Design Factors ◽  
Local Climate Zone

Surface urban heat island (SUHI) depicts the deteriorating thermal environment in high-density cities and local climate zone (LCZ) classification provides a universal protocol for SUHI identification. In this study, taking the central urbanized area of Guangzhou in the humid subtropical region of China as the study area, the maps or images of LCZ, land surface temperature, SUHI, and urban design factors were achieved using Landsat satellite data, GIS database, and a series of retrieval and classification algorithms, and the urban design factors influencing SUHI were investigated based on 625 samples of LCZs. The results show that on the 18 September 2016 at the local time of 10:51 a.m., the land surface temperature (LST) varied greatly from 26 °C to 40 °C and the SUHI changed with a wide range of −6 °C to 8 °C in the LCZs of the study area. Seven and five urban design factors influencing the summer daytime SUHI were identified for the two dominant LCZs of LCZs 1–5 (LCZ 1 to LCZ 5) and the mixed LCZ (containing at least three types of LCZs), respectively, in which vegetation cover ratio, floor area ratio, ground emissivity, and complete surface area ratio showed negative correlations and building density showed positive correlations. The summer daytime SUHI prediction models were obtained by using the step-wise multiple linear regression, with the performance of R2 of 0.774, RMSE of 0.95 °C, and the d value of 0.91 for the model of LCZs 1–5, and the values of 0.819, 0.81 °C, and 0.94 for the model of the mixed LCZ, indicating that the models can effectively predict the changes of SUHI with LCZs. This study presents a methodology to efficiently achieve a large sample of SUHI and urban design factors of LCZs, and provides information beneficial to the urban designs and regenerations in high-density cities.

scholarly journals Urban Design Factors Influencing Surface Urban Heat Island in the Humid Subtropical Region Based on Local Climate Zone

2019 ◽  
Author(s):  
Yurong Shi ◽  
Yirui Xiang ◽  
Yufeng Zhang
Keyword(s):  
Urban Heat Island ◽  
Urban Design ◽  
Heat Island ◽  
Subtropical Region ◽  
Local Climate ◽  
Factors Influencing ◽  
Urban Heat ◽  
Surface Urban Heat Island ◽  
Design Factors ◽  
Local Climate Zone

Surface urban heat island (SUHI) depicts the deteriorating thermal environment in high-density cities and local climate zone (LCZ) classification provides a universal protocol for SUHI identification. In this study, taking the central urbanized area of Guangzhou in the humid subtropical region of China as the study area, the maps or images of LCZ, land surface temperature (LST), SUHI and urban design factors were achieved by using Landsat satellite data, GIS database and a series of retrieval and classification algorithms, and the urban design factors influencing SUHI were investigated based on 625 samples of LCZs. The results show that in the summer daytime under the clear sky condition, the LST varied greatly from 26 °C to 40 °C and the SUHI changed in a wide range of -6 °C to 8 °C in the LCZs of the study area. Seven and five urban design factors influencing the summer daytime SUHI were identified for the two dominant LCZ of LCZs 1-5 (LCZ 1 to LCZ 5) and the mixed LCZ (containing at least three types of LCZs), respectively. The summer daytime SUHI prediction models were obtained by using the step-wise multiple linear regression, with the performance of R2 of 0.697, RMSE of 1.21 °C, and the d value of 0.81 for the model of LCZs 1-5, and the values of 0.666, 1.66 °C, and 0.76 for the model of the mixed LCZ, indicating that the models can predict the changes of SUHI with LCZs to a large and satisfactory extent. This study presents a methodology to efficiently achieve a large sample of SUHI and urban design factors of LCZs in the largely urbanized cities, and provides information beneficial to the urban designs and regenerations in the humid subtropical region.

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