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Open AccessArticle

Increasing Evapotranspiration on Extensive Green Roofs by Changing Substrate Depths, Construction, and Additional Irrigation

1
Department of Landscape Ecology, Faculty of Landscape Sciences and Geomatics (LG), University of Applied Sciences, Neubrandenburg, 17033 Neubrandenburg, Germany
2
Department of Geography, Humboldt University of Berlin, Rudower Chausee 16, 10099 Berlin, Germany
3
Institute of Architecture, Technical University of Berlin, Strasse des 17 Juni 152, 10623 Berlin, Germany
4
German Association of Green Roofs and Green Walls (Bundesverband GebäudeGrün e.V. (BuGG)), Albrechtstraße 13, 10117 Berlin, Germany
*
Author to whom correspondence should be addressed.
Buildings 2019, 9(7), 173; https://doi.org/10.3390/buildings9070173
Received: 30 May 2019 / Revised: 16 July 2019 / Accepted: 18 July 2019 / Published: 23 July 2019
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. View Full-Text
Keywords: extensive green roofs; storm water; evapotranspiration; retention; rain water management; urban heat island; irrigation extensive green roofs; storm water; evapotranspiration; retention; rain water management; urban heat island; irrigation
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Kaiser, D.; Köhler, M.; Schmidt, M.; Wolff, F. Increasing Evapotranspiration on Extensive Green Roofs by Changing Substrate Depths, Construction, and Additional Irrigation. Buildings 2019, 9, 173.

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