Summertime heat island intensities in three high-rise housing quarters in inner-city Shanghai China: Building layout, density and greenery

Yang, Feng; Lau, Ssy; Qian, Feng

doi:10.1016/j.buildenv.2009.05.010

Cited by 127 publications

(78 citation statements)

References 22 publications

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“…While little research takes place at the single-building level, recent contributions highlight the importance of not just of the urban surface materials but the density, juxtaposition, and pattern of land features [33][34][35]. Using datasets such as ASTER, Quickbird, and Landsat ETM+, researchers show that proximity to asphalt surfaces and dark roofs and the pattern of impervious surfaces increase land surface temperature and denser nearby vegetation cools surfaces [36,37].…”

Section: Introductionmentioning

confidence: 99%

Rooftop Surface Temperature Analysis in an Urban Residential Environment

et al. 2015

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Abstract:The urban heat island (UHI) phenomenon is a significant worldwide problem caused by rapid population growth and associated urbanization. The UHI effect exacerbates heat waves during the summer, increases energy and water consumption, and causes the high risk of heat-related morbidity and mortality. UHI mitigation efforts have increasingly relied on wisely designing the urban residential environment such as using high albedo rooftops, green rooftops, and planting trees and shrubs to provide canopy coverage and shading. Thus, strategically designed residential rooftops and their surrounding landscaping have the potential to translate into significant energy, long-term cost savings, and health benefits. Rooftop albedo, material, color, area, slope, height, aspect and nearby landscaping are factors that potentially contribute. To extract, derive, and analyze these rooftop parameters and outdoor landscaping information, high resolution optical satellite imagery, LIDAR (light detection and ranging) point clouds and thermal imagery are necessary. Using data from the City of Tempe AZ (a 2010 population of 160,000 people), we extracted residential rooftop footprints and rooftop configuration parameters from airborne LIDAR point clouds and QuickBird satellite imagery (2.4 m spatial resolution imagery). Those parameters were analyzed against surface temperature data from the MODIS/ASTER airborne simulator (MASTER). MASTER images provided fine resolution (7 m) surface temperature data for residential areas during daytime and night time. Utilizing these data, ordinary least squares (OLS) regression was used to evaluate the relationships between residential building OPEN ACCESSRemote Sens. 2015, 7 12136 rooftops and their surface temperature in urban environment. The results showed that daytime rooftop temperature was closely related to rooftop spectral attributes, aspect, slope, and surrounding trees. Night time temperature was only influenced by rooftop spectral attributes and slope.

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Section: Introductionmentioning

confidence: 99%

Rooftop Surface Temperature Analysis in an Urban Residential Environment

et al. 2015

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“…Therefore, green cover ratio, tree cover ratio, and lawn cover ratio are usually adopted to quantify the vegetation in urban climate research, which are normally found to be negatively related with air temperature [39,92,93]. Among all vegetation types, trees are considered more influential on air temperature reduction than grass, since tree canopy can provide shading in addition to the evapotranspiration effect [6,36,94,95]. The cooling effect of trees depends on the species and canopy size.…”

Section: Urban Vegetation Descriptorsmentioning

confidence: 99%

“…The cooling effect of trees depends on the species and canopy size. The tree view factor (TVF) has been used to evaluate the shading ability provided by trees, which is calculated, similarly to the sky view factor, by WinSCANOPY software (a digital image analyser for canopy and solar radiations analysis, developed by Regent Instruments Inc., Québec, QC, Canada) using sky view images taken by a camera with a fisheye lens [6]. TVF is defined as the fraction occupied by vegetation canopy of the overlying hemisphere.…”

Section: Urban Vegetation Descriptorsmentioning

confidence: 99%

“…The urban heat island (UHI), as an indicator of urban climate modification, has been investigated extensively since it was first time documented by Luke Howard in 1818. The UHI phenomenon has been identified and recorded for most of the major cities in the world [1][2][3][4][5][6]. Evidence of the negative influences of UHI on energy consumption, air pollution, and public health began to accumulate decades ago.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Urban Design Descriptors on Outdoor Thermal Environment: A Literature Review

et al. 2017

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This paper presents a literature review on urban design indicators addressing the impact of urban geometry and vegetation on the outdoor thermal environment at the pedestrian level, as urban geometry and vegetation have been regarded as the most influential urban design factors that affect outdoor microclimate. The thermal balance concept is first introduced to elaborate how each component of energy fluxes is affected by the urban built environment, which helps to explore the underlying thermophysical mechanisms of how urban design modifies the outdoor thermal environment. The literature on numerous urban design descriptors addressing urban geometric characteristics is categorized into five groups in this paper according to the design features that the parameters entail, including land use intensity, building form, canyon geometry, space enclosure and descriptive characteristics. The literature on urban vegetation descriptors is reviewed together, followed by the combined effect of urban geometry and vegetation. This paper identifies a series of important urban design parameters and shows that the impact of design parameters on thermal environment varies with time, season, local climate and urban contexts. Contradictory impacts often occur between daytime and nighttime, or different seasons, which requests trade-offs to be achieved when proposing design strategies.

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“…Careful design of urban form and the use of green infrastructure can mitigate this effect [5]; many studies showed the benefits of vegetation such as trees [6][7][8][9] and Parks [10][11][12][13]. However there are often many other, sometimes competing, drivers which affect the design of our urban forms.…”

Section: Introductionmentioning

confidence: 99%

Environmental Thermal Impact Assessment of Regenerated Urban Form: A Case Study in Sheffield

Fahmy¹,

Hathway²,

Pattacini³

et al. 2011

Linköping Electronic Conference Proceedings

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Urban comfort is becoming increasingly important due to climate change, increasing population and urbanization. Greater use of mechanical cooling is not reasonable due to consuming more energy, discharging anthropogenic heat and CO 2 emissions which all can be minimized by passive strategies. As part of the EPSRC funded project Urban River Corridors and Sustainable Living Agendas, URSULA, two radically different urban regenerations for a site in Sheffield were passively designed and had to be microclimatically assessed upon their thermal impacts. Passive design strategy for the first is wind tunneling and solar shelter effects owed to compact form that provides river bank access by perpendicular streets. The second, park option, offers space for the river to flood into a green channel which provides evaporative cooling. Simulations using ENVI-met BETA4 applied four receptors to record different meteorology and the pedestrian comfort in terms of Predicted Mean Vote, PMV. The increased green coverage showed horizontal shifting of about 0.2 with 2h of urban time lag in PMV records from 14.00-16.00LST in some places. Results give advantage for the park option design but needs more emphasize on indoor performance.

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Summertime heat island intensities in three high-rise housing quarters in inner-city Shanghai China: Building layout, density and greenery

Cited by 127 publications

References 22 publications

Rooftop Surface Temperature Analysis in an Urban Residential Environment

Rooftop Surface Temperature Analysis in an Urban Residential Environment

The Impact of Urban Design Descriptors on Outdoor Thermal Environment: A Literature Review

Environmental Thermal Impact Assessment of Regenerated Urban Form: A Case Study in Sheffield

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