Journal
SUSTAINABLE CITIES AND SOCIETY
Volume 80, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scs.2022.103798
Keywords
Surface urban heat island; Enhanced vegetation index; Blue green infrastructure; Climate change; Urbanisation; Thermal environment
Categories
Funding
- UK government's Natural Environment Research Council (NERC) [NE/R002681/1]
- NERC [NE/R002681/1] Funding Source: UKRI
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This paper investigates the urban thermal environment and vegetation abundance in four East African cities and explores the role of blue green infrastructure in mitigating urban heat island effects. The Local Climate Zone framework is used to analyze the seasonality of Land Surface Temperature and Enhanced Vegetation Index, revealing the complex relationship between vegetation and thermal behavior in urban areas.
Rapid urbanisation and climate change are two major trends in Africa in need of further investigation. In this paper, the urban thermal environment and vegetation abundance in four East African cities (Khartoum, Addis Ababa, Kampala and Dar es Salaam) were characterised, providing new insights into the role and potentials of blue green infrastructure in differing climate regions. The Local Climate Zone (LCZ) framework was employed to detect the seasonal Land Surface Temperature (LST) and Enhanced Vegetation Index (EVI) derived from Landsat8 data. Significant LST differences between LCZs in dry and rainy seasons were confirmed using a Welch's T test. The LCZs were found to offer potentially new approaches to investigating issues pertaining to urban heating in data-scarce regions. Greater surface urban heat island (SUHI) intensity during the rainy season was apparent in Khartoum and Addis Ababa, emphasising the importance of seasonality in urban thermal studies. Spatial correlations between EVI and LST within each LCZ were analysed through Moran's I and further illustrated the complex relationships of vegetation and thermal behaviour in urban areas. Despite these complexities, urban blue green infrastructure was found to moderate the SUHI, with different types of intervention required across different LCZs.
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