Experimental evaluation of urban heat island mitigation potential of retro-reflective pavement in urban canyons

Rossi, Federico; Castellani, Beatrice; Presciutti, Andrea; Morini, Elena; Anderini, Elisabetta; Filipponi, Mirko; Nicolini, Andrea

doi:10.1016/j.enbuild.2016.05.036

Cited by 103 publications

(40 citation statements)

References 22 publications

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“…In terms of statistics, the UHI effects are found in more than 1000 cities of different sizes through all latitudes in both hemispheres, and more cities will suffer from it in the future [11]. In past years, many efforts have been made to mitigate the negative impacts caused by UHI, such as new roofing and paving materials, and more green space areas [12][13][14][15]. Thus, it has become a major research focus in urban climatology and urban ecology since first reported in 1818 [16].…”

Section: Introductionmentioning

confidence: 99%

Mapping the Influence of Land Use/Land Cover Changes on the Urban Heat Island Effect—A Case Study of Changchun, China

Yang

Yan

et al. 2017

Sustainability

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Abstract:The spatio-temporal patterns of land use/land cover changes (LUCC) can significantly affect the distribution and intensity of the urban heat island (UHI) effect. However, few studies have mapped a clear picture of the influence of LUCC on UHI. In this study, both qualitative and quantitative models are employed to explore the effect of LUCC on UHI. UHI and LUCC maps were retrieved from Landsat data acquired from 1984, 1992, 2000, 2007, and 2014 to show their spatio-temporal patterns. The results showed that: (1) both the patterns of LUCC and UHI have had dramatic changes in the past 30 years. The urban area of Changchun increased more than four times, from 143.15 km 2 in 1984 to 577.45 km 2 in 2014, and the proportion of UHI regions has increased from 15.27% in 1984 to 29.62% in 2014; (2) the spatiotemporal changes in thermal environment were consistent with the process of urbanization. The average LST of the study area has been continuously increasing as many other land use types have been transformed to urban regions. The mean temperatures were higher in urban regions than rural areas over all of the periods, but the UHI intensity varied based on different measurements; and (3) the thermal environment inside the city varied widely even within a small area. The LST possesses a very strong positive relationship with impervious surface area (ISA), and the relationship has become stronger in recent years. The UHI we employ, specifically in this study, is SUHI (surface urban heat island).

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Section: Introductionmentioning

confidence: 99%

Mapping the Influence of Land Use/Land Cover Changes on the Urban Heat Island Effect—A Case Study of Changchun, China

Yang

Yan

et al. 2017

Sustainability

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“…The shade generated by the new tall buildings may produce a retrieved albedo lower than its correct value, even if the Landsat 7 passages at around 12:00 reduce this effect, since midday sun position causes a reduction of the buildings shadow extension. Overall, taking into account the impact of the area with vegetation on albedo measurements, the new building system and impervious surfaces present an undiminished albedo pattern [46] with respect to the pre-intervention scene.…”

Section: Albedo Maps and Analytical Analysismentioning

confidence: 99%

Remote Sensing Techniques for Urban Heating Analysis: A Case Study of Sustainable Construction at District Level

et al. 2017

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Abstract:In recent years, many new districts in urban centres have been planned and constructed to reshape the structure and functions of specific areas. Urban regeneration strategies, planning and design principles have to take into account both socioeconomic perspectives and environmental sustainability. A district located in the historical city centre of Terni (Italy), Corso del Popolo, was analysed to assess the construction effects in terms of surface urban heat island (SUHI) mitigation. This district is an example of urban texture modification planned in the framework of the regeneration of the ancient part of the town. The changes were realised starting from 2006; the new area was completed on June 2014. The analysis was carried out by processing Landsat 7 ETM+ images before and after the interventions, retrieving land surface temperature (LST) and albedo maps. The map analysis proved the SUHI reduction of the new area after the interventions: as confirmed by the literature, such SUHI mitigation can be ascribed to the presence of green areas, the underground parking, the partial covering of the local roadway and the shadow effect of new multi-storey buildings. Moreover, an analysis of other parameters linked to the impervious surfaces (albedo, heat transfer and air circulation) driving LST variations is provided to better understand SUHI behaviour at the district level. The district regeneration shows that wisely planned and developed projects in the construction sector can improve urban areas not only economically and socially, but can also enhance the environmental impact.

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“…As regards RR materials, previous experimental studies have focused on: (i) the analytical modelling of RR materials' behaviour for perpendicular incident radiation [37]; (ii) the evaluation of the optic properties of RR samples for several angles of incidence [38]; and (iii) the evaluation of RR cooling effect at the urban canyon level in terms of reduction of the energy circulating inside the canyon [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of the Effect of Geometry and Façade Materials on Urban District’s Equivalent Albedo

et al. 2017

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Urban Heat Island (UHI) is influenced by urban form, geometry, and the properties of surfaces. Retroreflective (RR) materials have been proposed as a countermeasure to UHI, thanks to their optical property of reflecting most of the incident solar energy back towards the same direction. In this paper, the effect of RR materials on urban districts was investigated. They were applied on building façades of urban districts with different urban forms and orientations. To this aim, an experimental model resembling urban districts with different geometries was built and RR materials on vertical surfaces were tested and compared to conventional construction materials with similar global reflectance. The trend of the instantaneous albedo was monitored during the day and a new parameter called "equivalent albedo" was used to demonstrate the effectiveness of the RR materials. The comparative analysis shows that the RR façades lead to an increase of the equivalent albedo for all of the investigated urban patterns. For a block pattern, the equivalent albedo increase is equal to 3%, while for canyon patterns it is equal to 7%. Results of energy evaluations show that the energy savings obtainable with the use of RR materials is comparable to the values of anthropogenic heat emissions in residential areas.

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Experimental evaluation of urban heat island mitigation potential of retro-reflective pavement in urban canyons

Cited by 103 publications

References 22 publications

Mapping the Influence of Land Use/Land Cover Changes on the Urban Heat Island Effect—A Case Study of Changchun, China

Mapping the Influence of Land Use/Land Cover Changes on the Urban Heat Island Effect—A Case Study of Changchun, China

Remote Sensing Techniques for Urban Heating Analysis: A Case Study of Sustainable Construction at District Level

Experimental Analysis of the Effect of Geometry and Façade Materials on Urban District’s Equivalent Albedo

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