Comparative analysis of green actions to improve outdoor thermal comfort inside typical urban street canyons

Lobaccaro, Gabriele; Acero, Juan A.

doi:10.1016/j.uclim.2015.10.002

Cited by 153 publications

(94 citation statements)

References 42 publications

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“…In fact, as the buildings in site B are very high (around 70 to 104 m), the effect of vegetation on top of such buildings did not reach the pedestrian level. There is previous research that revealed that the green roofs on top of high-rise buildings do not have any significant effect on air temperature for pedestrians [18,[54][55][56].…”

Section: The Effectiveness Of Nbs On Thermal Comfort Enhancement (Howmentioning

confidence: 99%

“…High-rise buildings absorb sun energy during the day and release it during the night. As a result, the temperature does not get reduced enough during the night time in these sites, and it causes an urban heat island (see also [55]), which can be controlled relatively by implementing NBS measures.…”

Section: The Effectiveness Of Nbs On Thermal Comfort Enhancement (Howmentioning

confidence: 99%

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Planning Nature-Based Solutions for Urban Flood Reduction and Thermal Comfort Enhancement

et al. 2019

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As a consequence of climate change and urbanization, many cities will have to deal with more flooding and extreme heat stress. This paper presents a framework to maximize the effectiveness of Nature-Based Solutions (NBS) for flood risk reduction and thermal comfort enhancement. The framework involves an assessment of hazards with the use of models and field measurements. It also detects suitable implementation sites for NBS and quantifies their effectiveness for thermal comfort enhancement and flood risk reduction. The framework was applied in a densely urbanized study area, for which different small-scale urban NBS and their potential locations for implementation were assessed. The overall results show that the most effective performance in terms of flood mitigation and thermal comfort enhancement is likely achieved by applying a range of different measures at different locations. Therefore, the work presented here shows the potential of the framework to achieve an effective combination of measures and their locations, which was demonstrated on the case of the Sukhumvit area in Bangkok (Thailand). This can be particularly suitable for assessing and planning flood mitigation measures in combination with heat stress reduction.

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Section: The Effectiveness Of Nbs On Thermal Comfort Enhancement (Howmentioning

confidence: 99%

Section: The Effectiveness Of Nbs On Thermal Comfort Enhancement (Howmentioning

confidence: 99%

Planning Nature-Based Solutions for Urban Flood Reduction and Thermal Comfort Enhancement

et al. 2019

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“…Evidence from some previous simulation studies suggest that, apart from the increased shadowing, extra trees will also act as additional barriers to the outgoing longwave radiation and wind flow. As a consequence, both longwave radiation loss and heat removal through convection phenomena can be significantly attenuated, leading eventually to a rise of the ambient T air [119][120][121][122][123]. A summary of the results of the previously mentioned studies is presented in Table 2.…”

Section: Adding Street Trees and Hedgesmentioning

confidence: 99%

“…The cooling potential of the unique application of grass on urban ground surfaces has been assessed by a rather small number of scientific studies, whereas most of the encountered simulation studies have been carried out with the ENVI-met model. Lobaccaro and Acero [121] have examined potential changes on summer surface, air and mean radiant temperature, after replacing 30% of a generic street canyon's surface with grass of 50 cm in height; the canyon is considered to be located both in a mid-rise and high-rise area. Their results suggested a small reduction of the peak T air at the mid-rise area, reaching 0.24 • C, while the T surf and T mrt were also reduced in both areas by 5.30 • C-8.80 • C and 4.6-10.0 • C, respectively.…”

Section: Adding Grassmentioning

confidence: 99%

Urban Warming and Cities’ Microclimates: Investigation Methods and Mitigation Strategies—A Review

et al. 2020

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The increased rates of urbanization and industrialization of the 20th and 21st centuries have dramatically changed the land use and cover of modern cities, contributing to the degradation of the urban microclimate and the rise of the ambient urban air temperatures. Given the multiple negative energy, environmental and social consequences of urban warming, the present paper summarizes the findings of previous studies, assessing the main causes of the phenomenon along with the key investigation methods involving experimental and computational approaches. There follows a description of the most common mitigations, and adaption strategies towards the attenuation of urban warming are described. The analyzed elements include the addition of green spaces such as trees, grass and green roofs; changes on the albedo of the urban surfaces and water-based techniques, as well as a combination of them. The discussion of the reported findings in the existing literature clearly reflects the impact of urban morphology on the outdoor thermal environment, providing also useful information for professionals and urban planners involved at the phase of decision-making.

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“…Similarly, the duration of direct sun exposure and the mean radiant temperature affect urban thermal comfort under the influence of urban layouts [34]. Other studies have also evaluated the importance of green roofs under different climatic conditions [34,35]. The morning, afternoon, and evening T air values of the morphologies with grass-planted and concrete roofs varied.…”

Section: All Simulationsmentioning

confidence: 99%

Evaluating the Impact of the Morphological Transformation of Urban Sites on the Urban Thermal Microenvironment

Ali

2018

Buildings

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Tropical cities currently face issues of climate change resulting from rapid urbanization and the impact of urban morphological transformations on the microclimate. The analysis of urban physical forms and patterns is a realisticmethodfor quantifying these impacts. This work examined the impact of morphological transformations of an urban site in Wuhan, China, on the microthermal environment at different time periods. We also quantified and compared the impact of four urban site morphologies on ambient air temperature. The morphological changes of the study site were inferred from Google Earth images acquired at different time points in 2006 and 2013. ENVI-met simulation software was used to compare the changes in temperature at the selected site by specific date. The year- and time-based analysis of existing urban morphologies and their impact on the microurban thermal environment shows that the overall minimum and maximum values of morning and afternoon ambient air temperature are nearly the same for the 2013 and 2006 morphologies. The maximum temperature difference was observed in the afternoon (14:00), with an average difference of approximately 2 °C in the east. The findings of this research could provide a useful guide for optimizing the transformation of urban site planning and design and a suitable method for assessing the impact of built-up areas on the environment.

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Comparative analysis of green actions to improve outdoor thermal comfort inside typical urban street canyons

Cited by 153 publications

References 42 publications

Planning Nature-Based Solutions for Urban Flood Reduction and Thermal Comfort Enhancement

Planning Nature-Based Solutions for Urban Flood Reduction and Thermal Comfort Enhancement

Urban Warming and Cities’ Microclimates: Investigation Methods and Mitigation Strategies—A Review

Evaluating the Impact of the Morphological Transformation of Urban Sites on the Urban Thermal Microenvironment

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