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A methodology for the assessment of compound sea level and rainfall impact on urban drainage networks in a coastal city under climate change

Laster Grip, Isabelle ; Haghighatafshar, Salar LU orcid and Aspegren, Henrik LU orcid (2021) In City and Environment Interactions 12(December 2021).
Abstract
This study seeks to investigate how stormwater drainage systems in coastal cities respond to climate change in terms of simultaneous sea level rise and rainfall. 7.5 years of recorded rainfall and sea level data in the city of Trelleborg in Sweden were used to generate projections of future climate events based on the emission scenario RCP8.5. Twelve scenarios were formulated to represent rain and sea level in today’s (reference)- and future climate. Future rainfall was computed using regional climate model data together with the Delta Change Method. Sea-related data was represented with two variables, namely an average sea level and storm surges. The average sea level was calculated to reflect seasonal variation using a second-order... (More)
This study seeks to investigate how stormwater drainage systems in coastal cities respond to climate change in terms of simultaneous sea level rise and rainfall. 7.5 years of recorded rainfall and sea level data in the city of Trelleborg in Sweden were used to generate projections of future climate events based on the emission scenario RCP8.5. Twelve scenarios were formulated to represent rain and sea level in today’s (reference)- and future climate. Future rainfall was computed using regional climate model data together with the Delta Change Method. Sea-related data was represented with two variables, namely an average sea level and storm surges. The average sea level was calculated to reflect seasonal variation using a second-order Fourier analysis whilst raw gauge data was used to capture the storm surges. The two sea variables were then scaled to represent future projections of sea level rise and storm surges in the study area. The performance of the drainage system was simulated with MIKE Urban 1D model and the results were expressed through two indicators, number of flooded nodes and flood frequency. The results of this study reveal a tipping point is likely to be found between years 2075 and 2100, after which storm surges become a major driver for overwhelmed drainage system. It was also found that pluvial floods may become more likely and frequent during winters as time progresses. This has a great implication when deciding on adaptation measures.
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Multi-hazard, Storm surges, Urban flooding, Climate adaptation, Infrastructure, Compound flooding
in
City and Environment Interactions
volume
12
issue
December 2021
article number
100074
pages
12 pages
publisher
Elsevier
external identifiers
  • scopus:85122705976
ISSN
2590-2520
DOI
10.1016/j.cacint.2021.100074
language
English
LU publication?
yes
id
b4519a7b-4409-49c1-88d5-c98f23f55994
date added to LUP
2021-09-23 11:30:23
date last changed
2023-12-08 04:07:16
@article{b4519a7b-4409-49c1-88d5-c98f23f55994,
  abstract     = {{This study seeks to investigate how stormwater drainage systems in coastal cities respond to climate change in terms of simultaneous sea level rise and rainfall. 7.5 years of recorded rainfall and sea level data in the city of Trelleborg in Sweden were used to generate projections of future climate events based on the emission scenario RCP8.5. Twelve scenarios were formulated to represent rain and sea level in today’s (reference)- and future climate. Future rainfall was computed using regional climate model data together with the Delta Change Method. Sea-related data was represented with two variables, namely an average sea level and storm surges. The average sea level was calculated to reflect seasonal variation using a second-order Fourier analysis whilst raw gauge data was used to capture the storm surges. The two sea variables were then scaled to represent future projections of sea level rise and storm surges in the study area. The performance of the drainage system was simulated with MIKE Urban 1D model and the results were expressed through two indicators, <i>number of flooded nodes</i> and <i>flood frequency</i>. The results of this study reveal a tipping point is likely to be found between years 2075 and 2100, after which storm surges become a major driver for overwhelmed drainage system. It was also found that pluvial floods may become more likely and frequent during winters as time progresses. This has a great implication when deciding on adaptation measures.<br/>}},
  author       = {{Laster Grip, Isabelle and Haghighatafshar, Salar and Aspegren, Henrik}},
  issn         = {{2590-2520}},
  keywords     = {{Multi-hazard; Storm surges; Urban flooding; Climate adaptation; Infrastructure; Compound flooding}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{December 2021}},
  publisher    = {{Elsevier}},
  series       = {{City and Environment Interactions}},
  title        = {{A methodology for the assessment of compound sea level and rainfall impact on urban drainage networks in a coastal city under climate change}},
  url          = {{http://dx.doi.org/10.1016/j.cacint.2021.100074}},
  doi          = {{10.1016/j.cacint.2021.100074}},
  volume       = {{12}},
  year         = {{2021}},
}