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Blue-green stormwater systems for citywide flood mitigation : Monitoring, conceptualization, modeling, and evaluation

Haghighatafshar, Salar LU (2019)
Abstract
Considering the growth in urbanization, leading to an increase in impervious surfaces, and the changing climate, enhancing the intensity and frequency of rainfall events, existing urban drainage networks—separate or combined sewer systems—are presumed to face substantially elevated hydraulic loads, causing pluvial floods in urban areas.
There are several ways to address these challenges. Cities can invest in replacing existing pipes with new larger pipes to enhance the hydraulic capacity of the drainage network. This solution is considered to be extremely expensive and unsustainable. An alternative solution is to manipulate urban surfaces by constructing blue-green (open) stormwater systems. These systems are built on urban surfaces... (More)
Considering the growth in urbanization, leading to an increase in impervious surfaces, and the changing climate, enhancing the intensity and frequency of rainfall events, existing urban drainage networks—separate or combined sewer systems—are presumed to face substantially elevated hydraulic loads, causing pluvial floods in urban areas.
There are several ways to address these challenges. Cities can invest in replacing existing pipes with new larger pipes to enhance the hydraulic capacity of the drainage network. This solution is considered to be extremely expensive and unsustainable. An alternative solution is to manipulate urban surfaces by constructing blue-green (open) stormwater systems. These systems are built on urban surfaces and include approaches that mimic natural processes, such as infiltration, evaporation, transpiration, pond storage, and slow transport of stormwater through ditches. The implementation of blue-green stormwater systems in dense cities would, to some extent, relieve the overload. However, the method for identifying urban areas in which the implementation of blue-green stormwater systems would have a larger effect hydraulically on the existing sewer network is unestablished.
Thus, general aim of this thesis was to develop a method for studying the interactions between piped drainage networks and blue-green stormwater systems on the city-scale, performed in four steps, which shape the backbone of this thesis:
•An existing blue-green stormwater system—i.e. the Eco-city of Augustenborg in Malmö—was examined to understand how such systems work, locally and regarding the surrounding neighborhoods.
•A simple conceptual model for blue-green stormwater systems was proposed.
•Based on the proposed concept, a fast, easy-to-use, and robust modeling tool was developed, making it possible to simulate the interaction between blue-green stormwater systems and sewer networks.
•The modeling tool was supplemented with a hydroeconomic optimization algorithm and evaluated on the city-scale to identify the most effective site and size for blue-green stormwater systems throughout the catchment of the sewer network.
The developed method and toolchain constitute a new platform for increasing our understanding of complex urban drainage networks. This platform is also a starting point for the development of a more reliable tool for the initial screening of urban catchments to identify urban areas in which it is hydraulically and economically efficient to construct neighborhood-scale blue-green stormwater systems.
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author
supervisor
opponent
  • Professor Rauch, Wolfgang, University of Innsbruck, Austria
organization
publishing date
type
Thesis
publication status
published
subject
keywords
blue-green measures, drainage system, flooding, flood mitigation, hydrodynamic modeling, rainfall-runoff, stormwater
pages
133 pages
publisher
Water and Environmental Engineering Department of Chemical Engineering
defense location
Lecture hall K:C, Kemicentrum, Naturvetarvägen 14, Lund University, Faculty of Engineering LTH, Lund
defense date
2019-10-25 09:15:00
ISBN
978-91-7422-682-9
978-91-7422-681-2
project
Blue-green stormwater systems for citywide flood mitigation - Monitoring, conceptualization, modelling, and evaluation
language
English
LU publication?
yes
id
3a0d53c5-0d4e-485c-bc78-6837a1d35cdb
date added to LUP
2019-08-22 11:16:43
date last changed
2019-10-02 02:21:04
@phdthesis{3a0d53c5-0d4e-485c-bc78-6837a1d35cdb,
  abstract     = {Considering the growth in urbanization, leading to an increase in impervious surfaces, and the changing climate, enhancing the intensity and frequency of rainfall events, existing urban drainage networks—separate or combined sewer systems—are presumed to face substantially elevated hydraulic loads, causing pluvial floods in urban areas. <br/>There are several ways to address these challenges. Cities can invest in replacing existing pipes with new larger pipes to enhance the hydraulic capacity of the drainage network. This solution is considered to be extremely expensive and unsustainable. An alternative solution is to manipulate urban surfaces by constructing blue-green (open) stormwater systems. These systems are built on urban surfaces and include approaches that mimic natural processes, such as infiltration, evaporation, transpiration, pond storage, and slow transport of stormwater through ditches. The implementation of blue-green stormwater systems in dense cities would, to some extent, relieve the overload. However, the method for identifying urban areas in which the implementation of blue-green stormwater systems would have a larger effect hydraulically on the existing sewer network is unestablished.<br/>Thus, general aim of this thesis was to develop a method for studying the interactions between piped drainage networks and blue-green stormwater systems on the city-scale, performed in four steps, which shape the backbone of this thesis:<br/>•An existing blue-green stormwater system—i.e. the Eco-city of Augustenborg in Malmö—was examined to understand how such systems work, locally and regarding the surrounding neighborhoods.<br/>•A simple conceptual model for blue-green stormwater systems was proposed.<br/>•Based on the proposed concept, a fast, easy-to-use, and robust modeling tool was developed, making it possible to simulate the interaction between blue-green stormwater systems and sewer networks.<br/>•The modeling tool was supplemented with a hydroeconomic optimization algorithm and evaluated on the city-scale to identify the most effective site and size for blue-green stormwater systems throughout the catchment of the sewer network.<br/>The developed method and toolchain constitute a new platform for increasing our understanding of complex urban drainage networks. This platform is also a starting point for the development of a more reliable tool for the initial screening of urban catchments to identify urban areas in which it is hydraulically and economically efficient to construct neighborhood-scale blue-green stormwater systems.<br/>},
  author       = {Haghighatafshar, Salar},
  isbn         = {978-91-7422-682-9 },
  language     = {eng},
  month        = {09},
  publisher    = {Water and Environmental Engineering Department of Chemical Engineering},
  school       = {Lund University},
  title        = {Blue-green stormwater systems for citywide flood mitigation : Monitoring, conceptualization, modeling, and evaluation},
  url          = {https://lup.lub.lu.se/search/ws/files/69673955/Haghighatafshar_S._2019_PhD_Thesis.pdf},
  year         = {2019},
}