Integrating conventional and green roofs for mitigating thermal discomfort and water scarcity in urban areas

Santos, Sylvana Melo dos; Silva, Jhonata Fernandes Ferreira; Santos, Gilles Chaves dos; Macedo, Patrícia Martins Torres de; Gavazza, Sávia

doi:10.1016/j.jclepro.2019.01.068

Cited by 23 publications

(6 citation statements)

References 33 publications

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“…Several studies have been conducted on the temperature regime of green roofs compared to traditional roofs to prove that vegetative roofs protect the roof membrane from extreme temperature fluctuations [80][81][82]. Their results confirmed that green roof protected the roof membrane from high temperature fluctuations.…”

Section: Discussionmentioning

confidence: 89%

“…During colder winter days, daily average substrate temperature values were similar to that of the traditional roof surface, mostly due to partial plant coverage. In addition, Dos Santos et al [81] indicated that the use of green roofs resulted in lower temperature variations throughout the day, decreased internal temperatures, and decreased thermal amplitude in relation to a conventional roof (with tiles). The reduction was 0.8 • C, 1.7 • C and 1.6, respectively.…”

Section: Green Roof Vs Conventional/traditional Roofsmentioning

confidence: 99%

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Green Roof Design: State of the Art on Technology and Materials

Cascone

2019

Sustainability

142

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In order to consider green roofs as an environmentally friendly technology, the selection of efficient and sustainable components is extremely important. Previous review papers have mainly focused on the performance and advantages of green roofs. The objective of this paper is to examine the primary layers: The waterproof and anti-root membranes; the protection, filter, and drainage layers; the substrate; and the vegetation. First, the history, modern applications, benefits and classification are analyzed in order to present a well-defined state of the art of this technology. Then, the roles, requirements, characteristics, and materials are assessed for each green roof layers. This technology was compared to a conventional roof technology, Mediterranean climate conditions and their influence on green roof design were assessed, also comparing them with Tropical area and focusing on irrigation systems, examples about the commercial materials and products available in the market were provided and innovative materials coming from recycled sources were analyzed. Future research should evaluate new materials for green roof technologies, in order to enhance their performance and increase their sustainability. The information provided in this review paper will be useful to develop Mediterranean green roof guidelines for selecting suitable components and materials during the design and installation phases.

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Section: Discussionmentioning

confidence: 89%

Section: Green Roof Vs Conventional/traditional Roofsmentioning

confidence: 99%

Green Roof Design: State of the Art on Technology and Materials

Cascone

2019

Sustainability

142

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“…The application of rooftop gardens onbuildings, or green roofs [1], which introduces a layer of vegetation, growing media and an additional drainage/auxiliary layers, has evidenced to improve storm water management [2,3], but this is not the only positive outcome resulting from these systems. They also produce positive impacts in many other aspects [4], such as reducing the heat island effect by decreasing the temperature in main city centers [5,6], ameliorating air pollution [7] and reducing energy consumption of buildings [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study of the Improvement on Energy Efficiency for a Building in the Mediterranean Area by the Installation of a Green Roof System

et al. 2020

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Rooftop gardens ona building have proved to be a good way to improve its storm water management, but many other benefits can be obtained from the installation of these systems, such as reduction of energy consumption, decrease of the heat stress, abatement on CO2 emissions, etc. In this paper, the effect from the presence of these rooftop gardens on abuilding’s energy consumption has been investigated by experimental campaigns using a green roof ona public building in a Mediterranean location in Spain. The obtained results demonstrate a substantial improvement by the installation of the green roof onthe building’s cooling energy demand for a standard summer day, in the order of 30%, and a reduction, about 15%, in the heating energy demand for a winter day. Thus, given the longer duration of the summer conditions along the year, a noticeable reduction on energy demand could be obtained. Simulation analysis, using commercial software TRNSYS code, previously calibrated using experimental data for typical summer and winter days, allows for the extrapolation to the entire year of these results deducing noticeable improvement in energy efficiency, in the order of 19%, but with an increase of 6% in the peak power during the winter period.

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“…Due to numerous bene ts, green and brown roofs, which differentiate only by the presence or absence of vegetation, are being applied in many countries. Bene ts include the increase in thermal comfort (Santos et al 2019), mitigating the urban heat island effect (Razzaghmanesh et al 2016), noise reduction (Connelly and Hodgson 2013), air quality improvement (Yang et al 2008), contribution to the landscape and recreational and habitat functions (Williams et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In case of green roofs acting as source of pollutants, they can contaminate water bodies (Karczmarczyk et al 2018). Some studies have already investigated the in uence of green roofs in Brazil (Vieira et al 2013;Noya et al 2017;Santos et al 2019;Castro et al 2020). Specially in a tropical climate, extensive green roof vegetation species need to endure a hot environment, high solar exposure, and wind.…”

Section: Introductionmentioning

confidence: 99%

Effects of ecological roofs in water quality: an experimental study over a humid tropical climate

Gomes

Santos

Macedo

2022

Sustain. Water Resour. Manag.

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Although ecological roofs (vegetated or non-vegetated) provide many bene ts, it can also leach substances such as nutrients and metals that can affect downstream aquatic ecosystems. Recife has a legislation requiring the installation of green roofs under certain conditions. Therefore, this work aims to investigate the rainwater quality from ecological roofs in Recife using local species in a tropical and humid climate. Using four test cells of 1m² (one non-vegetated lled with expanded clay aggregate, two vegetated with cactus "Coroa-de-Frade" and grass "Grama Esmeralda", and one control roof) we analyzed thirteen water quality variables regarding irrigation parameters: pH, electrical conductivity, turbidity, nitrate, ammonia, phosphate, bicarbonate, carbonate, calcium, magnesium, sulfate, potassium, boron, sodium, and sodium adsorption ratio. We simulated rain events controlling its intensity and analyzed a sample of natural rainwater event. All roofs neutralized the pH. Control and clay roofs were source of bicarbonate and calcium, responsible for more alkaline e uents. Carbonate and ammonia were below the recommended limits for irrigation purposes for all roofs. Green roofs were source of NO3-, NH4 + and B-. All roofs were neither source or sink for sulphate and chloride for all analyzed samples. Regarding the natural rainwater experiment, only green roof with Coroa-de-Frade exceeded the recommend irrigation parameters for potassium and phosphate. A post-treatment is required for irrigation purposes being recommended a rst-ush system followed by a lter with sand and activated carbon.

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Integrating conventional and green roofs for mitigating thermal discomfort and water scarcity in urban areas

Cited by 23 publications

References 33 publications

Green Roof Design: State of the Art on Technology and Materials

Green Roof Design: State of the Art on Technology and Materials

Study of the Improvement on Energy Efficiency for a Building in the Mediterranean Area by the Installation of a Green Roof System

Effects of ecological roofs in water quality: an experimental study over a humid tropical climate

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