The effect of unplanned growth of urban areas on heat island phenomena

Bek, M. A.; Azmy, Neveen Y.; El‐Kafrawy, Sameh B.

doi:10.1016/j.asej.2017.11.001

Cited by 39 publications

(18 citation statements)

References 8 publications

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“…Unplanned spatial growth of cities is a major cause of increasing land surface temperatures (LST) and the development of urban heat islands (UHI) [1]. Wong and Yu [2] reported that the highest concentration of hard surfaces such as buildings, roads, impervious areas, and fewer open spaces are the reasons for increasing urban surface temperature.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Effect of Spatial Growth on Land Surface Temperature in Dhaka

et al. 2020

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Spatial urban growth and its impact on land surface temperature (LST) is a high priority environmental issue for urban policy. Although the impact of horizontal spatial growth of cities on LST is well studied, the impact of the vertical spatial distribution of buildings on LST is under-investigated. This is particularly true for cities in sub-tropical developing countries. In this study, TerraSAR-X add-on for Digital Elevation Measurement (TanDEM-XDEM), Advanced Spaceborne Thermal Emission and Reflection (ASTER)-Global Digital Elevation Model (GDEM), and ALOS World 3D-30m (AW3D30) based Digital Surface Model (DSM) data were used to investigate the vertical growth of the Dhaka Metropolitan Area (DMA) in Bangladesh. Thermal Infrared (TIR) data (10.6-11.2µm) of Landsat-8 were used to investigate the seasonal variations in LST. Thereafter, the impact of horizontal and vertical spatial growth on LST was studied. The result showed that: (a) TanDEM-X DSM derived building height had a higher accuracy as compared to other existing DSM that reveals mean building height of the Dhaka city is approximately 10 m, (b) built-up areas were estimated to cover approximately 94%, 88%, and 44% in Dhaka South City Corporation (DSCC), Dhaka North City Corporation (DNCC), and Fringe areas, respectively, of DMA using a Support Vector Machine (SVM) classification method, (c) the built-up showed a strong relationship with LST (Kendall tau coefficient of 0.625 in summer and 0.483 in winter) in comparison to vertical growth (Kendall tau coefficient of 0.156 in the summer and 0.059 in the winter), and (d) the ‘low height-high density’ areas showed high LST in both seasons. This study suggests that vertical development is better than horizontal development for providing enough open spaces, green spaces, and preserving natural features. This study provides city planners with a better understating of sustainable urban planning and can promote the formulation of action plans for appropriate urban development policies.

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Section: Introductionmentioning

confidence: 99%

Monitoring Effect of Spatial Growth on Land Surface Temperature in Dhaka

et al. 2020

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“…Recently studies focusing on heat stress in informal settlements have done pioneering work in these communities. Studies by Adegun and Ayoola (2022), Baruti and Johansson (2020) and Bek et al, (2018) analyse heat stress and the urban heat island impacts in informal communities in Nigeria, Tanzania and Egypt, respectively. Informal, unplanned neighbourhoods are noted to be between 1 and 4 8C hotter than adjacent formal neighbourhoods (Bek et al, 2018).…”

Section: Literature Reviewmentioning

confidence: 99%

Ground-level documentation of heat stress exposure and response strategies in informal settlements in Tshwane, South Africa

Hugo

Sonnendecker²

2023

SASBE

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PurposeThe adverse impacts of climate change coupled with rapid informal urbanization in the Southern African region are increasing the vulnerability of already sensitive population groups. Consequently, these urban regions are highly vulnerable to urban heat island effects and heatwaves due to exogenous and endogenous factors. While the dynamic interplay between the built environment, climate and response strategies is known, this paper highlights the lived experience of informal settlement residents. It presents work from a project undertaken in Melusi, an informal settlement in Tshwane, South Africa, as a multi-disciplinary project focusing on improving the local resilience to climate change associated heat stress.Design/methodology/approachFollowing a mixed method approach, a semi-structured observational analysis of the spatial layout and material articulation of selected dwellings along with the continuous monitoring and recording of their indoor environments were undertaken.FindingsThe paper presents the research results in terms of the dwelling characteristics, as spatial and material-use strategies and documented heat stress exposure in these structures. The findings highlight that informal dwellings perform poorly in all cases due to endogenous factors and that inhabitants experience extreme heat stress conditions for between 6 and 10 h daily during the peak summer period.Originality/valueCurrently, there are little empirical data on the heat stress residents living in informal settlements in Southern Africa are experiencing. This article provides insight into the indoor environments of informal dwellings and hopes to contribute future guidelines or heat health policies.

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“…Las islas de calor urbano generan una serie de efectos ecológicos y ambientales en los climas urbanos, situaciones hidrológicas urbanas, propiedades del suelo, entorno atmosférico, los hábitos biológicos, ciclos de materiales, el metabolismo energético y la salud de los residentes (Zhang et al, 2016). El crecimiento urbano está siempre relacionado con el fenómeno de isla de calor (Bek et al, 2018). La exposición continua a un ambiente con elevadas temperaturas provoca trastornos como el agotamiento por deshidratación, calambres, síncopes, golpes de calor, la aparición de enfermedades cerebrovasculares y la aparición de serios problemas respiratorios (Gálvez, 2014).…”

Section: Introductionunclassified

Islas de calor urbano mediante imágenes satelitales en la ciudad de Juliaca durante el año 2019

Mamani¹,

Soto²,

Ruelas

2022

CYD

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Esta investigación se realizó en la ciudad de Juliaca entre abril y setiembre del 2019, con el objetivo de identificar islas de calor urbano mediante mapas de temperatura superficial basadas en imágenes satelitales del sensor térmico TIRS. Se utilizó correcciones de emisividad de superficie donde se estimó la temperatura de la superficie y se identificó islas de calor urbano en la ciudad de Juliaca. Los resultados mostraron ocho islas de calor urbano ubicados en la Sociedad de la Beneficencia Pública (24,8 °C), Cerro Huayna Roque (28,3 °C), Centro Comercial Plaza Vea (25,6 °C), Cuartel Francisco Bolognesi (26 °C), Estadio San Isidro (25,3 °C), Parque Cholo (24,4 °C), Estadio Politécnico de los Andes (26,1 °C) y el estadio Manuel A. Odría (25,9 °C). Se concluye que las islas de calor urbano se presentan en el centro de la ciudad y también en lugares con suelos desnudos.

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The effect of unplanned growth of urban areas on heat island phenomena

Cited by 39 publications

References 8 publications

Monitoring Effect of Spatial Growth on Land Surface Temperature in Dhaka

Monitoring Effect of Spatial Growth on Land Surface Temperature in Dhaka

Ground-level documentation of heat stress exposure and response strategies in informal settlements in Tshwane, South Africa

Islas de calor urbano mediante imágenes satelitales en la ciudad de Juliaca durante el año 2019

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