Evaluation of green infrastructure effects on tropical Sri Lankan urban context as an urban heat island adaptation strategy

Herath, Prabhasri; Halwatura, RU; Jayasinghe, G.Y.

doi:10.1016/j.ufug.2017.11.013

Cited by 118 publications

(59 citation statements)

References 35 publications

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“…To the best of our knowledge and the literature review to date, there are no reports of an integrated (combined) assessment using quantitative effectiveness of NBS measures for both flooding and heat stress mitigation. Moreover, a limited number of works studied the effectiveness of these measures in a highly dense urban area of a tropical environment [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Facing the challenge of urban climate change, adaptive planning at the micro level has gradually become a hot topic in the academic field, compared with macrolevel Vegetation elements in the outdoor thermal environment have also been demonstrated as an effective measure to attain cooling effects. Strategic design of urban greenery can effectively enhance the urban environment and outdoor thermal comfort [35]. The cooling effect of vegetation occurs through the process of shading, evapotranspiration, and changing wind patterns [36].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Analysis of Green Space Network Planning for the Cooling Effect of Residential Blocks in Summer: A Case Study in Shanghai

et al. 2018

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The effect of Urban Heat Islands (UHIs) is becoming increasingly serious in cities. Research on the adaptive planning policies for microthermal environments at the residential block level of cities is thus becoming of greater significance. Based on the cooling effect of planning control elements in residential block areas, the element effects characteristics of water bodies and vegetation distribution on the thermal environment of residential blocks were analyzed by using ENVI-met software. The simulation data analysis showed that the combination of water bodies and vegetation had a synergistic cooling effect. Based on these results, simulations of five effective adaptive measures were carried out step by step in planning scenarios, that is, improving the water bodies with vegetation corridors, the application of high-albedo material on streets, and increasing the number of green patches, east-west green corridors, and north-south green corridors. The results were as follows. First, although each of the five optimization strategies have a certain degree of cooling effect on the entire block, the superposition of each factor had a synergistic effect. Second, different spatial optimization strategies had different cooling ranges for each subzone. The optimization of the north-south green corridor, green patches, and water features corridors were particularly significant for microclimate cooling. The east-west green corridor has a certain influence on a certain range of downwind zones and had an auxiliary cooling effect. The high-albedo material also had a weak overall decrease function for the thermal environment. Finally, the downwind area of the urban creek network had a great impact on cooling intensity, with distance attenuation characteristics; it was also proposed that the comprehensive cooling effect of the green space network with optimized layout was greater than that of any single green space element. The optimization scenario planning research provided a method for improving the scientific distribution of adaptation measures in urban residential blocks.

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“…The majority of reviewed studies proposed multiple GI strategy as a way to reduce temperature and only a few of them dealt with a single GI strategy. Several studies showed that combination of multiple GI strategies give the best result towards improving microclimate and thermal comfort [24,38,39], whereas 'no greening' at all were used as the worst strategy [18]. The different types of GI included trees, grass, shrubs, greening on buildings (green roof and green walls) and parks.…”

Section: Uhi Mitigation Strategiesmentioning

confidence: 99%

“…There are relatively few studies (among the reviewed studies) that incorporate green walls as part of their UHI mitigation strategies. Herath et al [38] implemented green walls as an UHI adaption strategy in the city of Bambalapitiya, Sri Lanka and found that the addition of 50% green walls in the target area will result in temperature reduction of up to 1.86 °C. Meanwhile, a maximum temperature reduction of 8.4 °C in humid climate of Hong Kong with the use of vertical greenery systems was reported in an urban canyon [60].…”

Section: Green Wallsmentioning

confidence: 99%

“…Studies from tropical arid climate were few, as not many studies were undertaken in such climatic conditions (Africa being an example). Regarding the target area of application, majority of the studies have been targeted in the urbanized city center [13,15,38,56,87,88], where the UHI is known to be the most pronounced. University campuses were frequently used as field measurement areas [18,84,89,90].…”

Section: Figure 3 Distribution Of Reviewed Envi-met Studies By Year mentioning

confidence: 99%

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Green Infrastructure as an Urban Heat Island Mitigation Strategy - A Review

Balany

Muttil

et al. 2020

Preprint

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Research on urban heat mitigation has been growing in recent years with many of the studies focusing on green infrastructure (GI) as a strategy to mitigate the adverse effects of Urban Heat Island (UHI). This paper aims at presenting a review of the range of findings from GI research for urban heat mitigation through a review of scientific articles published during the years 2009-2019. This research includes a review of the different types of GI and its contribution for urban heat mitigation and human thermal comfort. In addition to analyzing different mitigation strategies, numerical simulation tools that are commonly used are also reviewed. It is seen that ENVI-met is one of the modelling tools that is considered as a reliable tool to simulate different mitigation strategies and hence has been widely used in the recent past. Considering its popularity in urban microclimate studies, this article also provides a review of ENVI-met simulation results that were reported in the reviewed papers. It was observed that the majority of the research was conducted on a limited spatial scale and focused on temperature and human thermal comfort.

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Evaluation of green infrastructure effects on tropical Sri Lankan urban context as an urban heat island adaptation strategy

Cited by 118 publications

References 35 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

Adaptive Analysis of Green Space Network Planning for the Cooling Effect of Residential Blocks in Summer: A Case Study in Shanghai

Green Infrastructure as an Urban Heat Island Mitigation Strategy - A Review

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