Spatio-temporal analysis of built-up impervious surface area and interplay with land surface temperature in Pretoria, South Africa

Adeyemi, Adeniyi; Ramoelo, Abel; Cho, Moses Azong; Strydom, Jacobus

doi:10.1080/10106049.2021.1980617

Cited by 4 publications

(2 citation statements)

References 69 publications

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“…UHIs characterise the discernible temperature variance between microclimates within a city and its surrounding areas [9]. The expansion of cities has amplified the UHI effect, contributing to increased energy consumption, exacerbated pollution, and adverse effects on public health and well-being [10][11][12]. Thus, addressing this phenomenon promptly is crucial, necessitating a comprehensive understanding of the factors influencing UHIs to effectively mitigate their detrimental impacts.…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Urban Morphology on Urban Heat Islands in Housing Areas: The Case of Erzurum, Turkey

Güller,

Toy

2024

Sustainability

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The growing importance of climate change underlines the need to comprehend Urban Heat Islands (UHI), particularly those influenced by urban morphology. As progress has been made in understanding the macroscale relationship between urban morphology and UHIs, the microscale effects are often overlooked. This study, conducted in the city of Erzurum in Turkey, delves into the complex relationship between urban morphology and UHI intensity in different housing areas with distinct microclimates, focusing particularly on street networks, building systems, and land use. Pearson correlation analysis was performed to investigate the relationships between morphological indicators and UHIs in different housing areas. Key findings include that (1) noticeable UHI effects were observed, especially in dense areas with high-rise buildings. (2) UHIs reveal a strong correlation with both 2D and 3D urban morphological indicators. A moderate-to-high Sky View Factor (SVF) tends to reduce UHIs, while an extremely high SVF aggravates UHIs. (3) Enhancing street network integration emerges as a more effective strategy for mitigating UHI effects in mid-rise buildings compared to other morphological factors. The Normalised Difference Built-Up Index (NDBI) and Normalised Difference Vegetation Index (NDVI) may not reliably indicate UHIs in housing areas with a predominantly rural character. Consequently, this article recommends that urban morphology optimisation for UHI mitigation should prioritise spatial and indicator specificity in urban design and spatial planning for cities. Future research endeavours should investigate the influence of morphological indicators on UHI dynamics in different seasons, including various remote sensing indicators related to morphological structure, to enrich our understanding of daily UHI fluctuations within urban morphology research.

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Section: Introductionmentioning

confidence: 99%

The Impacts of Urban Morphology on Urban Heat Islands in Housing Areas: The Case of Erzurum, Turkey

Güller,

Toy

2024

Sustainability

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“…Consequently, urban areas exhibit higher air and surface temperatures compared to outlying rural regions, known as the urban heat island (UHI) phenomenon [3]. With the ongoing expansion of cities, the UHI effect has been intensifying, leading to various detrimental impacts on society, including increased energy consumption [4], aggravated pollution [5], and adverse effects on people's health conditions and status of wellbeing [6]. Therefore, it is imperative to address this issue urgently and gain a clear understanding of the factors influencing UHI in order to effectively mitigate its harmful effects.…”

Section: Introductionmentioning

confidence: 99%

How Urban Morphology Relates to the Urban Heat Island Effect: A Multi-Indicator Study

2023

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Urban morphology quantitatively expresses a city’s spatial structure, internal relationships, and physical form. It has advantages for predicting urban growth and analyzing the current state of cities in the literature. A comprehensive study on the complex relationships between urban morphology and urban heat island intensity (UHII) is of great importance for mitigating the urban heat island (UHI) effect for megacities. This study models urban morphological indicators in fine resolution based on three aspects: building morphology, ecological infrastructure, and human activities. The model accurately captures UHII by employing the definition of UHI effects. The relationship between urban morphology and UHII was further examined using extreme gradient boosting (XGBoost) and Shapley additive explanations (SHAP). By taking central Beijing, China as study area, major findings include the following: (1) Significant daytime UHI effects were observed within the research area, particularly during the summer months, when it appears to be most severe. More than 90% of the region experiences varying degrees of the UHI effects. (2) UHI is significantly correlated with both 2D and 3D urban morphological indicators. Low sky view factor (SVF) and high SVF tend to mitigate UHI, whereas moderate SVF tends to aggravate UHI. (3) In densely populated areas, tall trees may be more effective than other forms of vegetation at mitigating UHI. Based on the aforementioned findings, this article suggests that urban morphology optimization should focus on seasonality, spatial specificity, and indicator specificity for megacities in urban design and spatial planning aimed at mitigating UHI.

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Assessing heat risk in a sub-saharan African humid city, Lagos, Nigeria, using numerical modelling and open-source geospatial socio-demographic datasets

Benjamin Obe,

Morakinyo,

Mills

2023

City and Environment Interactions

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Spatio-temporal analysis of built-up impervious surface area and interplay with land surface temperature in Pretoria, South Africa

Cited by 4 publications

References 69 publications

The Impacts of Urban Morphology on Urban Heat Islands in Housing Areas: The Case of Erzurum, Turkey

The Impacts of Urban Morphology on Urban Heat Islands in Housing Areas: The Case of Erzurum, Turkey

How Urban Morphology Relates to the Urban Heat Island Effect: A Multi-Indicator Study

Assessing heat risk in a sub-saharan African humid city, Lagos, Nigeria, using numerical modelling and open-source geospatial socio-demographic datasets

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