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<p>Urban Heat Island (UHI) is a local as well as micro-climatic event for large metropolitan and rapidly growing cities worldwide. Therefore, it is indispensable to understand the impact of urban landscape changes on local climatic variation in the cities. Thus, this study focuses on seasonal variation of the UHI concerning land use/land cover alterations and thermal cooling efficiency during 1991–2020 over the fastest-growing urban-industrial centre in eastern India, Asansol Urban Agglomeration, using geospatial techniques. Indices such as DBI, DBSI, EBBI, NDVI, NDBI, SAVI, EVI2, and PV are employed to differentiate the urban built-up lands from other dry lands. After that, the UHI index, Thermal hotspots (THs), and Thermal Comfort Index (TCI) were analysed based on land surface temperature. Results reveal that the dry and bare surfaces in the rural surroundings are highly heated during the daytime, while the cooling effect is found in green and blue spaces over the study area. The THs have significantly increased from 1.19% in 1991 to 2.78% in 2020 and high TCI has been observed over the green spaces (GS) e.g., forest and parklands. Moreover, the “V” shaped thermal profiles have been detected in a 1&#xa0;km buffer over GS and their surroundings. This study suggests a unified framework for sustainable heat reduction through nature-based solutions (i.e., green infrastructure) to improve the quality of urban dwellers by reducing thermal stress.</p> Graphical Abstract <p></p>

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Monitoring of Urban Heat Island Intensities and Outdoor Thermal Comfort in an Industrial City: A Study Towards Sustainable Urban Heat Reduction

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Biswajit Maity,
  • Somnath Rudra,
  • Suraj Kumar Mallick,
  • Malay Pramanik

摘要

Urban Heat Island (UHI) is a local as well as micro-climatic event for large metropolitan and rapidly growing cities worldwide. Therefore, it is indispensable to understand the impact of urban landscape changes on local climatic variation in the cities. Thus, this study focuses on seasonal variation of the UHI concerning land use/land cover alterations and thermal cooling efficiency during 1991–2020 over the fastest-growing urban-industrial centre in eastern India, Asansol Urban Agglomeration, using geospatial techniques. Indices such as DBI, DBSI, EBBI, NDVI, NDBI, SAVI, EVI2, and PV are employed to differentiate the urban built-up lands from other dry lands. After that, the UHI index, Thermal hotspots (THs), and Thermal Comfort Index (TCI) were analysed based on land surface temperature. Results reveal that the dry and bare surfaces in the rural surroundings are highly heated during the daytime, while the cooling effect is found in green and blue spaces over the study area. The THs have significantly increased from 1.19% in 1991 to 2.78% in 2020 and high TCI has been observed over the green spaces (GS) e.g., forest and parklands. Moreover, the “V” shaped thermal profiles have been detected in a 1 km buffer over GS and their surroundings. This study suggests a unified framework for sustainable heat reduction through nature-based solutions (i.e., green infrastructure) to improve the quality of urban dwellers by reducing thermal stress.

Graphical Abstract