4.7 Article

Fractal analysis of green roof spatial implementation in European cities

Journal

URBAN FORESTRY & URBAN GREENING
Volume 49, Issue -, Pages -

Publisher

ELSEVIER GMBH
DOI: 10.1016/j.ufug.2020.126629

Keywords

Green roof; Fractal analysis; Policies; Ecosystem services

Funding

  1. Ecole des Ponts ParisTech
  2. Veolia group
  3. EVNATURB project dealing with the evaluation of ecosystem performances for re-naturing urban environment [ANR-17-CE22-0002-01]

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To face the consequences of climate change and unsustainable urbanization, green roofs are currently widely implemented in urban environments. Despite their benefits to restore ecosystem services are quite well established at the roof scale, green roofs need to be widely and appropriately distributed to perform efficiently at larger scales. However for now, this scale-factor is not considered to guide and conduct green roof implementation policies. Here we show that a mull-scale analysis based on fractal theory is helpful in providing information for green roof implementation and in assessing the relevance of these policies. Computed for 9 European cities, green roofs fractal dimensions are sparse, ranging 0.49 to 1.35, and illustrate some different degrees of progress in urban greening. These results demonstrate some significant inconsistencies between political ambition and their in situ realization, and the necessity to better take into account the spatial distribution of green roof implementations in order to optimize their performances.

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