Cooling effect of greenery cover over a building

Takakura, T.; Kitade, Shuta; Goto, Eri

doi:10.1016/s0378-7788(98)00063-2

Cited by 166 publications

(63 citation statements)

References 2 publications

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“…The photosynthetic rates of vegetation plants have a close relationship with carbon sequestration (Yamori et al, 2016). In addition, previous studies have demonstrated that evapotranspiration is the most important contributing factor toward the cooling effect in green roofs (Takakura et al, 2000;Oberndorfer et al, 2007;Feng et al, 2010). The photosynthetic rates of the three Sedum species in wet treatment were similar to that of O. japonicus (Fig.…”

Section: Discussionmentioning

confidence: 56%

Photosynthetic and Transpiration Rates of Three <I>Sedum</I> Species Used for Green Roofs

Kuronuma

Watanabe

2017

Environmental Control in Biology

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Section: Discussionmentioning

confidence: 56%

Photosynthetic and Transpiration Rates of Three <I>Sedum</I> Species Used for Green Roofs

Kuronuma

Watanabe

2017

Environmental Control in Biology

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“…Previous field and modeling studies in various climatic zones indicate that an individual green roof can reduce roof surface temperature by 15-45 °C, near-surface air temperature by 2-5 °C and building energy consumption by up to 80% [3][4][5][6][7][8][9][10][11][12]. In an extremely compact tropical city such as Hong Kong with severe shortage of ground-level green spaces and intense UHI effects [13,14], green roof could bring significant benefits.…”

Section: Introductionmentioning

confidence: 99%

Green-Roof Effects on Neighborhood Microclimate and Human Thermal Sensation

2013

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Green roofs have been recognized as an effective sustainable design tool to mitigate urban heat island (UHI) effects. Previous studies have identified green-roof benefits in cooling and energy-conservation at the building scale, with limited exploration of the wider influence on neighborhood microclimate and human thermal comfort (HTC). This paper investigated the impacts of community-scale green-roof installation on air temperature and HTC in five typical residential neighborhoods of subtropical Hong Kong. The microclimate models ENVI-met and RayMan permitted studies of two main green-roof scenarios, namely extensive (EGR) and intensive (IGR). Microclimatic monitoring data from a local experimental green-roof site validated the modeling methods. The results verified that green-roof cooling effects were not restricted to rooftops, but extended to the ground to improve neighborhood microclimate. EGR reduced pedestrian-level air temperature by 0.4-0.7 °C, and IGR by 0.5-1.7 °C, with maximum effect in open-set low rise sites. Coverage by building footprints and building height dampened lateral and vertical advection of cool air generated by green roofs. Roof greening also improved notably the rooftop-podium level HTC. Diurnal duration of high heat stress was reduced by 6-9 h for EGR scenarios, and 9-11 h for IGR. The findings indicated that large-scale green-roof installation could bring neighborhood-wide cooling, mitigate urban heat island effect, and furnish more comfortable thermal environment for urban residents.

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“…Although vegetation is not as effective as substrates in retaining rainwater, vegetation prevents soil loss and solar radiation impacting green roofs [3,5,8], provides habitat, reduce the heat by evaporation [9,11], mitigates air pollution [10] and elevate the amenity [14].…”

Section: Discussionmentioning

confidence: 99%

Rainwater retention capacity of green roofs in subtropical monsoonal climatic regions: a case study of Taiwan

Fang

2010

WIT Transactions on Ecology and the Environment

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This study investigates how roof substrate and vegetation affect rainwater retention. The investigated parameters are lightweight substrate ratio, substrate depth, precipitation and vegetation type. A planting box was placed on the roof of a building to simulate a green roof. Scheduled artificial rainfall was used to test the rainwater retention capacity of various substrates, substrate depths and plant types. The experimental results indicate that precipitation, substrate depth, substrate ratio and vegetation type affect the rainwater retention capacity of green roofs. The rainwater retention rate is inversely proportional to precipitation intensity; that is, about 87-100% of rainwater is retained for light rain, 62-84% for moderate rain and only 26-33% for heavy rain. Different plants have different abilities to retain rainwater. In this study, Dianella ensifolia cv. 'Silvery Stripe' and Schefflera arboricola have the best water retention rates of 37-100%. Of the total amount of rainwater retained, the substrate accounts for 77-98% and vegetation accounts for 2-23%. In the sub-tropical region, the green roof water retention rate is roughly 30% of the total storm precipitation (100 mm). Thus, using a green roof is an effective strategy for managing urban stormwater.

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Cooling effect of greenery cover over a building

Cited by 166 publications

References 2 publications

Photosynthetic and Transpiration Rates of Three <I>Sedum</I> Species Used for Green Roofs

Photosynthetic and Transpiration Rates of Three <I>Sedum</I> Species Used for Green Roofs

Green-Roof Effects on Neighborhood Microclimate and Human Thermal Sensation

Rainwater retention capacity of green roofs in subtropical monsoonal climatic regions: a case study of Taiwan

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