Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 541435
Title Evaporation from (Blue-)Green Roofs : Assessing the benefits of a storage and capillary irrigation system based on measurements and modeling
Author(s) Cirkel, Dirk Gijsbert; Voortman, Bernard R.; Veen, Thijs van; Bartholomeus, Ruud P.
Source Water 10 (2018)9. - ISSN 2073-4441
DOI https://doi.org/10.3390/w10091253
Department(s) Soil Physics and Land Management
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Blue-green roofs - Capillary irrigation - Latent heat flux - Lysimeter - Potential and actual evaporation - Sedums - Sensible heat flux - Urban areas - Water availability
Abstract

Worldwide cities are facing increasing temperatures due to climate change and increasing urban density. Green roofs are promoted as a climate adaptation measure to lower air temperatures and improve comfort in urban areas, especially during intensive dry and warm spells. However, there is much debate on the effectiveness of this measure, because of a lack of fundamental knowledge about evaporation from different green roof systems. In this study, we investigate the water and energy balance of different roof types on a rooftop in Amsterdam, the Netherlands. Based on lysimeter measurements and modeling, we compared the water and energy balance of a conventional green roof with blue-green roofs equipped with a novel storage and capillary irrigation system. The roofs were covered either with Sedum or by grasses and herbs. Our measurements and modeling showed that conventional green roof systems (i.e., a Sedum cover and a few centimeters of substrate) have a low evaporation rate and due to a rapid decline in available moisture, a minor cooling effect. Roofs equipped with a storage and capillary irrigation system showed a remarkably large evaporation rate for Sedum species behaving as C3 plants during hot, dry periods. Covered with grasses and herbs, the evaporation rate was even larger. Precipitation storage and capillary irrigation strongly reduced the number of days with dry-out events. Implementing these systems therefore could lead to better cooling efficiencies in cities.

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