Construction of Urban Heat Island Network Based on Morphological Network Analysis and Graph Theory

Document Type : Research Paper

Authors

Department of Environmental Planning, Management and HSE,, Faculty of Environment, University of Tehran, Tehran, Iran

Abstract

Objective: The increase in ecological vulnerability in cities due to rising temperatures has received much attention in recent years. Accurate identification of the urban heat island network is very important for effectively reducing its impact. In many studies, the impact of heat island connectivity on these networks has been largely ignored. This study was conducted to fill this research gap by creating an urban heat island network based on the connectivity perspective to understand the structural characteristics of the effect of this network and evaluate it in order to determine the priority level for implementing temperature reduction measures in the Tehran metropolis.
Method: To achieve the above goal, after analyzing the ground surface temperature, areas with high temperatures were identified. Then, morphological spatial pattern analysis, morphological structure evaluation, and recognition of the importance of heat island sources were carried out. In the next stage, the resistance level against thermal diffusion was constructed, and, then, using the minimum cumulative resistance method, heat transfer corridors were identified and analyzed.
Results: The findings of this study identified 29 strong heat island cores in Tehran with a relatively scattered distribution, 8 of which showed very high heating power. 31 corridors connected these islands, 10 of which had the potential to increase temperatures significantly. In addition, in terms of spatial distribution, the heat island network fragments in Tehran were more densely located in the western and southern areas. The high density of heat islands in the western part of Tehran made planning to combat them more difficult and increased their influence. Also, the very dense islands located in the southwest of Tehran led to the identification of short heat corridors in this part of the city, which justified the increase in temperature. On the other hand, the results showed that the cores had the largest share in the heat island network in Tehran, which indicated the size of the heat islands and their regional distribution in the study area.
Conclusions: In this study, special attention has been paid to the structural characteristics of the urban heat islands of the study area and their degree of importance. This approach is simpler than previous methods of determining the size or density of blue-green spaces to achieve cooling effects. This framework can be used as a strategic measure to prevent the coalescence and expansion of urban heat islands and to avoid the unplanned increase of blue-green spaces aimed at reducing temperatures in urban areas. 

Keywords

Main Subjects

References

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Journal of Environmental Studies
Volume 51, Issue 1
June 2025
Pages 19-40

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