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| Titel |
The GREENROOF module (v7.3) for modelling green roof hydrological and energetic performances within TEB |
| VerfasserIn |
C. S. Munck, A. Lemonsu, R. Bouzouidja, V. Masson, R. Claverie |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 6 ; Nr. 6, no. 6 (2013-11-08), S.1941-1960 |
| Datensatznummer |
250085014
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| Publikation (Nr.) |
 copernicus.org/gmd-6-1941-2013.pdf |
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| Zusammenfassung |
| The need to prepare cities for climate change adaptation requests the urban
modeller community to implement sustainable adaptation strategies within their models to be tested against specific city morphologies and scenarios.
Greening city roofs is part of these strategies. In this context, the
GREENROOF module for TEB (town energy balance) has been developed to model
the interactions between buildings and green roof systems at the scale of
the city. This module, which combines the ISBA model (Interaction between Soil
Biosphere and Atmosphere) and TEB, allows for one to describe an extensive green
roof composed of four functional layers (vegetation – grasses or sedums;
substrate; retention/drainage layers; and artificial roof layers) and to
model vegetation-atmosphere fluxes of heat, water and momentum, as well as
the hydrological fluxes throughout the substrate and the drainage layers,
and the thermal fluxes throughout the natural and artificial layers of the
green roof. TEB-GREENROOF (SURFEX v7.3) should therefore be able to
represent the impact of climate forcings on the functioning of green
roof vegetation and, conversely, the influence of the green roof on the
local climate. An evaluation of GREENROOF is performed for a case study
located in Nancy (France) which consists of an instrumented extensive green
roof with sedums and substrate and drainage layers that are typical of this
kind of construction. After calibration of the drainage layer hydrological
characteristics, model results show good dynamics for the substrate water
content and the drainage at the green roof base, with nevertheless a
tendency to underestimate the water content and overestimate the drainage.
This does not impact too much the green roof temperatures, which present a
good agreement with observations. Nonetheless GREENROOF tends to
overestimate the soil temperatures and their amplitudes, but this effect is
less important in the drainage layer. These results are encouraging with
regard to modelling the impact of green roofs on thermal indoor comfort and
energy consumption at the scale of cities, for which GREENROOF will be
running with the building energy version of TEB – TEB-BEM. Moreover, with the
green roof studied for GREENROOF evaluation being a type of
extensive green roof widespread in cities, the type of hydrological characteristics highlighted
for the case study will be used as the standard configuration to model
extensive green roof impacts at the scale of cities. |
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