Urban heat island effects of various urban morphologies under regional climate conditions

Liu, Yan; Li, Qi; Yang, Liu; Mu, Kaikai; Zhang, Moyan; Liu, Jiaping

doi:10.1016/j.scitotenv.2020.140589

Cited by 119 publications

(38 citation statements)

References 67 publications

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“…LST varies among different LCZs with higher LST over builttype LCZs and lower LST over natural-type LCZs [9,20,21]. However, the spatiotemporal variations of LST based on LCZs are different across different cities [22][23][24]. Du et al [25] showed that remote-sensed LST varied with LCZ and seasons in Nanjing, China, with the largest LST difference in summer.…”

Section: Introductionmentioning

confidence: 99%

Urban Thermal Characteristics of Local Climate Zones and Their Mitigation Measures across Cities in Different Climate Zones of China

Yang

Qiao

et al. 2021

Remote Sensing

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Understanding the urban thermal environment is vital for improving urban planning and strategy development when mitigating urban heat islands. However, urban thermal characteristics of local climate zones (LCZ) are different within cities and most studies lack regional perspective. This study explored surface thermal performances of cities in three urban agglomerations (Jing-Jin-Ji, Yangtze River Delta and Pearl River Delta) in China using MODIS land surface temperature (LST). Besides that, the diurnal and seasonal LST variations of LCZs are also studied. Moreover, the optimal LCZs for better urban cooling are also investigated in this study. Although the thermal distributions of LCZs are different in China, there are still some similar features. Our four key findings were as follows. (1) LCZs in China are well classified, with average overall accuracy of 82% being higher than that in some previous studies. (2) The LST of mid-rise (LCZ 2, 5) is higher than that of high- and low-rise buildings (LCZ 1, 3, 4, 6); and compact buildings are warmer than open buildings (LCZ 1–3 > LST 4–6) in summer of China. That shows both mid-rise and compact buildings are not beneficial to cool urban. In addition, LST variations at daytime and in summer are more significant than nighttime and other seasons. (3) LST differences within LCZs are significant at p < 0.05, and are most significant in Jing-Jin-Ji (JJJ). The LST difference within built types (LCZ 1–10) is more significant than within natural types (LCZ A–G), showing that built types alteration will be more effective for thermal environmental improvement. (4) Under the current population and urban area, increasing greenness and water area in compact high-rise buildings are the most effective strategies for urban cooling in all three urban agglomerations, with the largest reduction in LST of 4.11 K in JJJ. These findings will provide support for thermal environment mitigation, urban planning and sustainable urban development.

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Section: Introductionmentioning

confidence: 99%

Urban Thermal Characteristics of Local Climate Zones and Their Mitigation Measures across Cities in Different Climate Zones of China

Yang

Qiao

et al. 2021

Remote Sensing

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“…By now, more than 50% of the people live in cities. This percentage is expected to grow, and by 2030, it may reach 60% [1,2]. For Hungary, this value is close to 70%.…”

Section: Introductionmentioning

confidence: 92%

“…For windows where the openings between the frame and sash are ≤ 500 mm 2 per meter of length, the value of R s = 0.18 m 2 K/W, while for significant openings are ≥ 1500 mm 2 per meter of length, the value of R s = 0.13 m 2 K/W must be taken into account. When the surface of openings is between 500-1500 mm 2 , this case is classified as slightly ventilated by the standard, and the thermal resistance can also be determined.…”

Section: Thermal Transmittancementioning

confidence: 99%

The Role of Façades in Solar Energy Utilization

Horn

Terjék

2020

Buildings

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During the summer, the environmental impact of building operations can be reduced by optimizing ventilation and preventing heat from entering the building. Shades are used to create a comfortable temperature state in interiors without operating mechanical equipment or using low-power systems. The most significant factor in reducing energy consumption would be if the spatial delimitation of buildings utilizes solar energy in a passive or active way. At the same time, limiting the energy entering through windows reduces the temperature of interiors and the amount of energy used for cooling; thus, the phenomenon of the urban heat island would be less exacerbated. In the case of existing historical buildings, there are limited possibilities to reduce the energy consumption of the building and to protect the buildings against excessive summer heating, especially in connection with the structural appearance of the doors and windows on the façade. This paper presents the preparation of a large-scale reconstruction project based on a newly developed combined window that can significantly reduce indoor summer overheating. Designing steps of the complex retrofitting of a traditional box-type window are highlighted based on the results of closely connected literature pertaining to thermal, ventilation, shading, and acoustical phenomena. The result is a detailed structural and technological design of the reconstruction for the historical window in a combined way, as the frame, glazing, ventilation, and shading are simultaneously developed and calculated approximately; moreover, active shading is integrated. One aim of this desktop study was to demonstrate that in the case of historical buildings, it is possible and necessary to reduce heat losses during the heating season and to minimize the risk of summer overheating, and to show that the surface of the façade could be converted into an energy producer.

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“…In recent decades, the world has experienced explosive population growth and urban sprawl (Seto et al 2012). The increase in building surface area and complex morphology has modified the surface physical properties and heat storage capacity, in turn dramatically altering the thermal environment (Grimm et al 2008, Liu et al 2020, Tiatragul et al 2017. A well-documented consequence of urban thermal environment change is the formation of the urban heat island (UHI) effect, which can have profound impacts on water and air quality, urban public health, energy consumption, and vegetation phenology (Coseo &Larsen 2019, Inouye 2015, Kolokotroni et al 2007, Taha 1997, Voogt &Oke 2003.…”

Section: Introductionmentioning

confidence: 99%

Complexity of the relationship between 2D/3D urban morphology and the land surface temperature: a multiscale perspective

Liu

Wang²,

Li³

et al. 2021

Environ Sci Pollut Res

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Urban morphology is a crucial contributor to urban heat island (UHI) effects. However, few studies have explored the complex effect of 2D/3D urban morphology on UHI from a multiscale perspective. In this study, We chose the central area of Jinan city, which was commonly known as the "furnace", as the case study area. novel 2D/3D urban morphology indexes-building coverage ratio (BCR)(for assessing the 2D building density), building volume density (BVD)( for assessing the 3D building density), and the frontal area index (FAI)(for assessing 3D ventilation conditions) were calculated and derived to investigated complexity of relationship between 2D/3D urban morphology and land surface temperature(LST) at different scales using the maximum information coefficient (MIC) and geographically weighted regression (GWR). The results indicated that (1) These newly 2D/3D urban morphology indexes as essential factors that are responsible for LST variation, BCR is the most important urban morphology index affecting the LST, followed by BVD and FAI. Importantly, the relationship between the BCR, BVD, and FAI and the LST was an inverse U-shaped curve. (2) The relationship between 2D/3D urban morphology and LST variation showed a significant scale effect. With increased grid size, the correlation between the BCR, BVD, and FAI and the LST strengthened, "inflection point" of inverse U-shaped curve was significantly declined, and their explanation rate to LST first increased and then decreased, with a maximum value at the 700-m scale. Additionally, the FAI exerted a stronger negative effect, while the BCR and BVD generally had stronger positive effects on LST as the grid size increasing. This study extends our scientific understanding of the complexity effect of urban morphology on LST and is of great practical significance for urban thermal environment regulation at multi-scale.

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Urban heat island effects of various urban morphologies under regional climate conditions

Cited by 119 publications

References 67 publications

Urban Thermal Characteristics of Local Climate Zones and Their Mitigation Measures across Cities in Different Climate Zones of China

Urban Thermal Characteristics of Local Climate Zones and Their Mitigation Measures across Cities in Different Climate Zones of China

The Role of Façades in Solar Energy Utilization

Complexity of the relationship between 2D/3D urban morphology and the land surface temperature: a multiscale perspective

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