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Impacts of monoculture and mixed vegetation on green roof hydrological function
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water. (Urban Water)ORCID iD: 0000-0002-4068-3905
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0001-5548-4397
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-1725-6478
2019 (English)In: Urban Water: Novatech 2019, Graie , 2019Conference paper, Published paper (Other academic)
Abstract [en]

A dense vegetation cover is usually desired to fulfil aesthetical expectations of green roofs, and therefore stress tolerant Sedum vegetation has traditionally been favoured for extensive green roofs. However, Sedum species’ low water use and low root biomass could prove suboptimal for the hydrological function of green roofs compared to vegetation’s with different resource use. This study looks at the hydrological performance of four different vegetation mixtures grouped based on Grime’s C-S-R life strategies a Sedum monoculture and a non-vegetated control. Runoff from seven rainfall events (3.4–8.4 mm) was recorded during one autumn season when temperatures were getting lower (6–13˚C) The results showed no relationship between vegetation cover and retention, and the roofs planted with a stress tolerant mixtures of species showed the greatest overall retention. Roofs planted with Sedum monoculture had the greatest vegetation cover but the lowest mean retention.

Abstract [fr]

Une couverture végétale dense est habituellement recherchée pour répondre aux attentes esthétiques associées aux toitures végétalisées. En conséquence, les plantes tolérantes au stress de genre Sedum ont été traditionnellement préférées pour les toitures végétales extensives. Cependant, la faible consommation en eau et la faible biomasse racinaire des Sedums pourraient s’avérer sous-optimales pour la fonction hydrologique de ces toitures en comparaison à une végétation qui aurait des besoins différents. Cette étude s’intéresse aux performances hydrauliques de quatre mélanges de plantes groupés suivant la théorie des stratégies CSR de Grime, d’une monoculture de Sedum et d’un toit de contrôle non végétalisé. Les débits de ruissellement provenant des différentes toitures ont été mesurés et enregistrés durant 7 pluies (3.4–8.4mm) d’automne (températures entre 6 et 13 ˚C). Les résultats n’ont pas mis en évidence de relations entre la couverture végétale et la rétention hydraulique des toits. Les toits végétalisés avec des mélanges de plantes tolérants au stress avaient, dans l’ensemble, la plus forte rétention hydraulique. Les toits végétalisés avec la monoculture de Sedum avaient la plus haute couverture végétale mais la plus faible rétention hydraulique.

Place, publisher, year, edition, pages
Graie , 2019.
Keywords [en]
green roof, plant selection, vegetation cover, stormwater retention, peak flow reduction, plant strategy
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-78827OAI: oai:DiVA.org:ltu-78827DiVA, id: diva2:1429252
Conference
10th International Novatech Conference, 1-5 July, 2019, Lyon
Projects
Improving the function of green roofs in demanding climatesStormwater&Sewers
Funder
Swedish Research Council Formas, 2014-00854Available from: 2020-05-08 Created: 2020-05-08 Last updated: 2020-05-18Bibliographically approved

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http://www.novatech.graie.org/documents/auteurs/1D22-097LON.pdf

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Lönnqvist, JoelBlecken, Godecke-TobiasViklander, Maria

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