Green roof performance potential in cold and wet regions

Johannessen, Birgitte Gisvold; Hanslin, Hans Martin; Muthanna, Tone Merete

doi:10.1016/j.ecoleng.2017.06.011

Cited by 64 publications

(65 citation statements)

References 43 publications

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“…TRD on the contrary showed the highest fraction retained (average of 46% in temperate season) and poorest with respect to absolute retention together with OSL (average of 36 mm/month in temperate season). Observed retention differences between the locations were most likely explained by variations in precipitation amounts, precipitation pattern and AET [38], but also local conditions like roof configuration and vegetation development might have influenced the results. AET in green roofs was found to increase with increasing soil moisture [54].…”

Section: Retentionmentioning

confidence: 97%

“…The best effect of increasing the storage capacity was found in OSL. This could be explained by the nature of the precipitation where OSL experiences more showers with dry periods between due to the inland climate, while the other locations experience more days with precipitation [38].…”

Section: Retentionmentioning

confidence: 99%

“…If that were the case, this explains the comparable observed retention performances even though the estimated total storage capacity varied from 9 to 36 mm between the different configurations. This corresponds to the findings in Johannessen, et al [38], where retention performance as a function of storage capacity in the same locations was modelled for a 30-year period.…”

Section: Retentionmentioning

confidence: 99%

“…If that were the case, this explains the comparable observed retention performances even though the estimated total storage capacity varied from 9-36 mm between the different configurations. This corresponds to the findings in Johannessen, et al [38], where retention performance as a function of storage capacity in the same locations was modelled for a 30-year period. Green roofs with substrate mats (SM) showed significantly lower retention in TRD and BER than the other configurations, while in SAN, the performance was comparable to the best configuration ( Figure 4).…”

Section: Retentionmentioning

confidence: 99%

“…Few actual field studies, and especially long duration studies, are available from cold and wet climates comparable to the Nordic climates, and design estimates for retention are needed. Most studies from locations with large seasonal variation in evapotranspiration report lower retention in winter and higher in summer [27,31,[38][39][40]. Some studies does also explain part of the observed seasonal variations as a result of seasonal variations in precipitation patterns [34,41].…”

Section: Retention Performancementioning

confidence: 99%

See 4 more Smart Citations

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Johannessen

Muthanna

Braskerud

2018

Water

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Climate change coupled with increasing urbanization has made extensive green roofs, both for retrofitting and new developments, an attractive way to bring nature back to cities, while managing stormwater. This study has investigated extensive green roof retention and detention performance based on 3-8 years of field data from four Norwegian locations representing typical cold and wet Nordic climates, also comparing several different commercial configurations. Accumulated retention was found to be 11-30% annually and 22-46% in May through October. The performance was found to be strongly dependent in evapotranspiration and less dependent on material storage capacities. Estimates for available storage capacities for precipitation events larger than 5 mm are given and can be useful for design purposes. Median observed peak attenuation compared to the precipitation ranged from 65 to 90% depending on locations and configurations. The event-based approach for evaluating detention was found to be challenging due to the nature of the precipitation in the studied locations. An alternative approach using flow duration curves based on the observed time series was tested and found to give valuable information on runoff patterns from green roofs and to be useful for evaluating green roof performance in relation to local requirements.

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Section: Retentionmentioning

confidence: 97%

Section: Retentionmentioning

confidence: 99%

Section: Retentionmentioning

confidence: 99%

Section: Retentionmentioning

confidence: 99%

Section: Retention Performancementioning

confidence: 99%

See 3 more Smart Citations

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Johannessen

Muthanna

Braskerud

2018

Water

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Rainwater and Green Roofs

Nazif

Razavi

Soleimani

et al. 2021

Handbook of Water Harvesting and Conservation

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On the use of multi-objective optimization for multi-site calibration of extensive green roofs

Abdalla

Alfredsen

Muthanna

2022

Preprint

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Conceptual hydrological models are practical tools for estimating the performance of green roofs. Such models require calibration to obtain parameter values, which limits their use when measured data are not available. One approach that has been thought to be useful is to transfer parameters from a gauged roof calibrated locally (single-site calibration) to a similar ungauged roof in a different location. This study tested this approach by transferring calibrated parameters of a conceptual hydrological model between sixteen extensive green roofs located in four Norwegian cities. The approach was compared with a multi-site calibration scheme that explores trade-offs of model performances between the sites. The results showed that single site calibration could yield optimal parameters for one site and perform poorly in other sites. In contrast, obtaining a common parameter set that yields satisfactory results (Kling Gupta Efficiency >0.5) for different sites, and roof properties could be achieved by multi-site calibration.

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Green roof performance potential in cold and wet regions

Cited by 64 publications

References 43 publications

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Rainwater and Green Roofs

On the use of multi-objective optimization for multi-site calibration of extensive green roofs

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