The influence of substrate and vegetation configuration on green roof hydrological performance

Stovin, Virginia; Poë, Simon; De-Ville, Simon; Berretta, Christian

doi:10.1016/j.ecoleng.2015.09.076

Cited by 142 publications

(107 citation statements)

References 33 publications

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“…Overall, the difference between the precipitation and runoff resulted in a 3% volume reduction for the black roof and 9% for the LECA-based roof. This is lower than the results presented by previous non-vegetated and green roof studies [1,3,[10][11][12][13]22,24]. In terms of Norwegian conditions, Braskerud [31] presented a 25% runoff reduction in extensive green roofs in Oslo.…”

Section: Retention Capacitycontrasting

confidence: 55%

“…The retention ranged from 14.1% for an asphalt roof to 29.7% for a media roof, and 52.6% for a vegetated roof. Comparing LECA-based (non-vegetated) and vegetated setups, higher levels of retention were observed using vegetated beds [10], with an annual volumetric retention of 54.5% for a LECA-based setup and 75.1% for a green roof. Johannessen and Muthanna [24] presented an annual runoff reduction of 17-30% for three coastal cities in Norway.…”

Section: A Brief Literature Reviewmentioning

confidence: 95%

“…The peak reductions varied between 25% and 65%, and peak delays varied between 20 min and 40 min. Stovin et al [10] concluded that peak reduction for rainfall larger than 10 mm varied from 29% for a LECA-based bed to 68% for a sedum roof. They also noted that vegetated beds with brick-based substrates offer consistently greater attenuation compared with the LECA-based substrate.…”

Section: A Brief Literature Reviewmentioning

confidence: 99%

“…Retention occurs through the combined process of evapotranspiration for vegetated solutions, and its annual runoff reduction has been extensively investigated [8][9][10][11][12][13]. On the other hand, detention performance indicators are increasingly required by stormwater designers to alleviate urban flooding due to capacity exceedance in sewer systems [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Hydrological Performance of LECA-Based Roofs in Cold Climates

Hamouz

Lohne

Wood³

et al. 2018

Water

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Rooftops represent a considerable part of the impervious fractions of urban environments. Detaining and retaining runoff from vegetated rooftops can be a significant contribution to reducing the effects of urbanization, with respect to increased runoff peaks and volumes from precipitation events. However, in climates with limited evapotranspiration, a non-vegetated system is a convenient option for stormwater management. A LECA (lightweight expanded clay aggregate)-based roof system was established in the coastal area of Trondheim, Norway in 2016. The roof structure consists of a 200 mm-thick layer of LECA ® lightweight aggregate, covered by a concrete pavement. The retention in the LECA-based roof was estimated at 9%, which would be equivalent to 0.27 mm/day for the entire period. The LECA-based configuration provided a detention performance for a peak runoff reduction of 95% (median) and for a peak delay of 1 h and 15 min (median), respectively. The relatively high moisture levels in the LECA-based roof did not affect the detention performance. Rooftop retrofitting as a form of source control may contribute to a change in runoff characteristics from conventional roofs. This study of the LECA-based roof configuration presents data and performance indicators for stormwater urban planners with regard to water detention capability.

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Section: Retention Capacitycontrasting

confidence: 55%

Section: A Brief Literature Reviewmentioning

confidence: 95%

Section: A Brief Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrological Performance of LECA-Based Roofs in Cold Climates

Hamouz

Lohne

Wood³

et al. 2018

Water

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“…Many researchers, in their experiments, use only model soil layers with vegetation, soil layers with the drain layer, or models of soil layers only [11,12]. In view of the impact on the environmental parameters in urban agglomerations, for the optimal selection of parameters of each layer of the reference roof and the species of the plants, two model green roofs were made on a laboratory scale (as shown in fig.…”

Section: Methodsmentioning

confidence: 99%

Model research on the influence of green roofs on environmental parameters in urban agglomerations

Suszanowicz

2018

E3S Web Conf.

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Abstract. This study presents features of green roofs in urban areas with a particular emphasis on the filtration of air pollutants, heavy metals removal, reduction of rainwater runoff from roof surfaces and thermal insulation. To carry out field studies on the influence of green roofs on the environment in urban areas, two green roof models on a laboratory scale were used. The observations of the prepared green roof models made during the summer, autumn and winter confirmed the extremely beneficial effect of this type of roof for the elimination of air pollutant, heavy metals, and particulate matter. The observations also confirmed that plants on a green roof growing on a soil layer absorb an average of 74% of rain water and then allow it to evaporate. The selection of plants for green roofs should mainly focus on how effectively they improve urban environmental parameters and remove air pollutants. The results of the study of the two green roof models on a laboratory scale are necessary to work out the parameters of layers of the roof and select the most appropriate plants for the reference research object on the roof of one of buildings of the University of Opole.

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Experimental study on the hydrological performance of green roofs in the application of novel biochar

Huang

Garg

Mei

et al. 2020

Hydrological Processes

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Biochar has the potential to be a soil amendment in green roofs owing to its water retention, nutrient supply, and carbon sequestration application. The combined effects of biochar and vegetated soil on hydraulic performance (e.g., saturated hydraulic conductivity, retention and detention, and runoff delay) are the crucial factor for the application of the novel biochar in green roofs. Recent studies investigated soil water potential (i.e., suction) either on vegetated soil or on biochar-amended soil but rarely focused on their integrated application. With the purpose of investigating the hydraulic performance of green roofs in the application of biochar, the combined effect of biochar and vegetated soil on hydrological processes was explored. Artificial rainfall experiments were conducted on the four types of experimental soil columns, including natural soil, biochar-amended soil, vegetated natural soil, and vegetated biocharamended soil. The surface ponding, bottom drainage and the volumetric water content were measured during the rainfall test. Simulation method by using HYDRUS-1D was adopted for estimating hydraulic parameters and developing modelling analysis. The results indicated that the saturated hydraulic conductivity of vegetated soil columns were higher than bare soil columns. The addition of biochar decreased the saturated hydraulic conductivity, and the magnitude of decrease was much significant in the case of vegetated soil. The influence of vegetation on permeability is more prominent than biochar. The vegetated biochar-amended soil has the highest retention and detention capacity, and shows a preferable runoff delay effect under heavy rain among the four soil columns. The results from the present study help to understand the hydrological processes in the green roof in the application of biochar, and imply that biochar can be an alternative soil amendment to improve the hydraulic performance.

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The influence of substrate and vegetation configuration on green roof hydrological performance

Cited by 142 publications

References 33 publications

Hydrological Performance of LECA-Based Roofs in Cold Climates

Hydrological Performance of LECA-Based Roofs in Cold Climates

Model research on the influence of green roofs on environmental parameters in urban agglomerations

Experimental study on the hydrological performance of green roofs in the application of novel biochar

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