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Main Title: Increasing Evapotranspiration on Extensive Green Roofs by Changing Substrate Depths, Construction, and Additional Irrigation
Author(s): Kaiser, Daniel
Köhler, Manfred
Schmidt, Marco
Wolff, Fiona
Type: Article
Language Code: en
Abstract: Urban environments are characterized by dense development and paved ground with reduced evapotranspiration rates. These areas store sensible and latent heat, providing the base for typical urban heat island effects. Green roof installations are one possible strategy to reintroduce evaporative surfaces into cities. If green roofs are irrigated, they can contribute to urban water management and evapotranspiration can be enhanced. As part of two research projects, lysimeter measurements were used to determine the real evapotranspiration rates on the research roof of the University of Applied Sciences in Neubrandenburg, Germany. In this paper, we address the results from 2017, a humid and cool summer, and 2018, a century summer with the highest temperatures and dryness over a long period of time, measured in Northeast Germany. The lysimeter measurements varied between the normal green roof layer (variation of extensive green roof constructions) and a special construction with an extra retention layer and damming. The results show that the average daily evapotranspiration rates can be enhanced from 3 to 5 L/m2/day under optimized conditions. A second test on a real green roof with irrigation was used to explain the cooling effects of the surface above a café building in Berlin.
Issue Date: 23-Jul-2019
Date Available: 12-Aug-2019
DDC Class: 720 Architektur
Subject(s): extensive green roofs
storm water
rain water management
urban heat island
Journal Title: Buildings
Publisher: MDPI
Publisher Place: Basel
Volume: 9
Issue: 7
Article Number: 173
Publisher DOI: 10.3390/buildings9070173
EISSN: 2075-5309
Appears in Collections:Inst. Architektur » Publications

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