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Efficiency of blue-green stormwater retrofits for flood mitigation – Conclusions drawn from a case study in Malmö, Sweden

Haghighatafshar, Salar LU ; Nordlöf, Beatrice; Roldin, Maria; Gustafsson, Lars-Göran; la Cour Jansen, Jes LU and Jönsson, Karin LU (2018) In Journal of Environmental Management 207. p.60-69
Abstract (Swedish)
Coupled one-dimensional (1D) sewer and two-dimensional (2D) overland flow hydrodynamic models were constructed to evaluate the flood mitigation efficiency of a renowned blue-green stormwater retrofit, i.e. Augustenborg, in Malmö, Sweden. Simulation results showed that the blue-green stormwater systems were effective in controlling local surface flooding in inner-city catchments, having reduced the total flooded surfaces by about 70%. However, basement flooding could still be a potential problem depending on the magnitude of the inflows through combined sewer from upstream areas. Moreover, interactions between blue-green retrofits and the surrounding pipe-system were studied. It was observed that the blue-green retrofits reduced the peak... (More)
Coupled one-dimensional (1D) sewer and two-dimensional (2D) overland flow hydrodynamic models were constructed to evaluate the flood mitigation efficiency of a renowned blue-green stormwater retrofit, i.e. Augustenborg, in Malmö, Sweden. Simulation results showed that the blue-green stormwater systems were effective in controlling local surface flooding in inner-city catchments, having reduced the total flooded surfaces by about 70%. However, basement flooding could still be a potential problem depending on the magnitude of the inflows through combined sewer from upstream areas. Moreover, interactions between blue-green retrofits and the surrounding pipe-system were studied. It was observed that the blue-green retrofits reduced the peak flows by approximately 80% and levelled out the runoff. This is a substantial advantage for downstream pipe-bound catchments, as they do not receive a cloudburst-equivalent runoff from the retrofitted catchment, but a reduced flow corresponding to a much milder rainfall. Blue-green retrofits are more effective if primarily implemented in the upstream areas of a pipe-bound catchment since the resulting reduced runoff and levelled out discharge would benefit the entire network lying downstream. Implementing blue-green retrofits from upstream towards downstream can be considered as a sustainable approach.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blue-green, Cloudburst, Urban Drainage, flood mitigation, Retrofit, stormwater, Stormwater system, Stormwater runoff, SUDS, LID
in
Journal of Environmental Management
volume
207
pages
10 pages
publisher
Academic Press
external identifiers
  • scopus:85034067619
ISSN
0301-4797
DOI
10.1016/j.jenvman.2017.11.018
language
English
LU publication?
yes
id
d3837477-edcb-450e-a89c-9ef4e069125d
date added to LUP
2017-12-12 15:29:48
date last changed
2018-01-07 12:28:32
@article{d3837477-edcb-450e-a89c-9ef4e069125d,
  abstract     = {Coupled one-dimensional (1D) sewer and two-dimensional (2D) overland flow hydrodynamic models were constructed to evaluate the flood mitigation efficiency of a renowned blue-green stormwater retrofit, i.e. Augustenborg, in Malmö, Sweden. Simulation results showed that the blue-green stormwater systems were effective in controlling local surface flooding in inner-city catchments, having reduced the total flooded surfaces by about 70%. However, basement flooding could still be a potential problem depending on the magnitude of the inflows through combined sewer from upstream areas. Moreover, interactions between blue-green retrofits and the surrounding pipe-system were studied. It was observed that the blue-green retrofits reduced the peak flows by approximately 80% and levelled out the runoff. This is a substantial advantage for downstream pipe-bound catchments, as they do not receive a cloudburst-equivalent runoff from the retrofitted catchment, but a reduced flow corresponding to a much milder rainfall. Blue-green retrofits are more effective if primarily implemented in the upstream areas of a pipe-bound catchment since the resulting reduced runoff and levelled out discharge would benefit the entire network lying downstream. Implementing blue-green retrofits from upstream towards downstream can be considered as a sustainable approach.<br/>},
  author       = {Haghighatafshar, Salar and Nordlöf, Beatrice and Roldin, Maria and Gustafsson, Lars-Göran and la Cour Jansen, Jes and Jönsson, Karin},
  issn         = {0301-4797},
  keyword      = {Blue-green,Cloudburst,Urban Drainage,flood mitigation,Retrofit,stormwater,Stormwater system,Stormwater runoff,SUDS,LID},
  language     = {eng},
  month        = {02},
  pages        = {60--69},
  publisher    = {Academic Press},
  series       = {Journal of Environmental Management},
  title        = {Efficiency of blue-green stormwater retrofits for flood mitigation – Conclusions drawn from a case study in Malmö, Sweden},
  url          = {http://dx.doi.org/10.1016/j.jenvman.2017.11.018},
  volume       = {207},
  year         = {2018},
}