A Nonlinear Reservoir Model to Simulate Blue-Green Stormwater Systems – An Application to Augustenborg Catchment in Malmö, Sweden
(2021) VVAM01 20211Chemical Engineering (M.Sc.Eng.)
- Abstract
- The increasingly rapid urbanization has led to vast impervious surface areas in the urban environment. This situation of impervious surfaces has increased the surface temperature and interrupted the natural water circle, which has negatively impacted the urban environment. Human activities' continuous greenhouse gas emission has contributed to global climate change, which has caused some atmospheric abnormalities like increased precipitation, leading to environmental hazards like pluvial flooding and combined sewer overflow (CSO). Several different stormwater control measures have been practiced and implemented to control the excess rainfall-runoff and help avoid overloading the drainage systems. Research has proven blue-green... (More)
- The increasingly rapid urbanization has led to vast impervious surface areas in the urban environment. This situation of impervious surfaces has increased the surface temperature and interrupted the natural water circle, which has negatively impacted the urban environment. Human activities' continuous greenhouse gas emission has contributed to global climate change, which has caused some atmospheric abnormalities like increased precipitation, leading to environmental hazards like pluvial flooding and combined sewer overflow (CSO). Several different stormwater control measures have been practiced and implemented to control the excess rainfall-runoff and help avoid overloading the drainage systems. Research has proven blue-green infrastructures to be efficient for managing stormwater runoff. However, the techniques for modeling blue-green stormwater systems have also been identified to be very complex and complicated due to the large number of parameters involved. This characteristic has made it challenging to develop simple simulation models to relate the area's physical characteristics where the systems are being implemented.
Hence, this study aimed to develop a simple model with few parameters (corresponding to physical characteristics of the systems) for fast and reliable simulation of blue-green systems. The methodology used in this study was to couple "nonlinear reservoir model" to "hydraulic representation". This quantification and calibration were done in a simple nonlinear reservoir simulation model developed in this study using Excel software. Augustenborg is an area located in Malmö, Sweden, consisting of two main sustainable drainage systems (SuDS) implemented in the North and South of the neighbourhood. This thesis focused on the blue-green stormwater systems in Northern SuDS in Auguestenborg.
The Northern SuDS consists of seven stormwater control measures (SCMs), including swales, wet ponds, and a rectangular channel connected to a sewer pipe network. Each system has a connecting catchment, and the governing equations used in developing the nonlinear reservoir model are the continuity equation and flow equations. The flow equations used in this study are Manning's equation (for swales and rectangular channel) and a discharge equation through an orifice (for wet ponds).
The nonlinear routing parameters were calibrated for each catchment connecting to a system after relating the physical characteristics of the catchments using Manning's equation. After developing the model and obtaining the calibrated parameter values, the model was tested and validated with measured data. The discharge flows from the model were compared to the measured discharge flows.
The model showed a good response time to the discharge flow when validated with measured data. This study developed an easy-to-use physical-based model and was able to quantify nonlinear reservoir routing parameters based on the physical characteristics of the blue-green stormwater systems implemented in the case study. (Less) - Popular Abstract
- Developing an easy-to-use stormwater simulation model for green structures.
Using green stormwater control structures is an excellent method in controlling accumulated water from rainfall to avoid flooding. However, this method is not easy to monitor because of too many properties involved. This study aims to develop an easier way to monitor this method of stormwater control.
The green stormwater control structures consist of several physical properties. These physical properties have made it complicated to develop a straightforward method that can be used to monitor how the stormwater is being transported through the green structures and into the drainage pipe network. This stormwater management method always has different types of... (More) - Developing an easy-to-use stormwater simulation model for green structures.
Using green stormwater control structures is an excellent method in controlling accumulated water from rainfall to avoid flooding. However, this method is not easy to monitor because of too many properties involved. This study aims to develop an easier way to monitor this method of stormwater control.
The green stormwater control structures consist of several physical properties. These physical properties have made it complicated to develop a straightforward method that can be used to monitor how the stormwater is being transported through the green structures and into the drainage pipe network. This stormwater management method always has different types of interconnected structures, and each system has different physical properties. For example, an area could have a green structural method of stormwater control, consisting of four different types of systems. Each structure might have three properties that make up the structure; in other words, there are many different physical properties to handle when monitoring stormwater discharge from a green structural stormwater control method, excluding the catchment properties where the systems are implemented.
In the case of the study area for this study, Augustenborg, "an area located in the city of Malmö, Sweden," the green structural method focused on in this study area consists of seven systems. Each system has its physical properties and has a catchment area connecting to it. The catchment areas have different parameter values defining them. This study aims to develop a possible way of handling these parameters and develop a simple model to be used in simulating the stormwater discharge through the green systems and into the drainage pipe system in the study
area.
The different physical properties of the seven systems in this study were included in developing the model and the physical properties of the catchment areas. This study was able to relate the properties of these catchments using a flow equation in order to determine the storage coefficient value for each catchment. Several modifications (fine-tuning) were carried out on the model to obtain an appropriate value to produce good model results. The results from the model were compared with actual results from the study area to determine the accuracy of the results the model produced.
The simple developed model was able to relate the physical properties of green structural stormwater control systems in the study area using the flow equation and other relevant equations. The model produced similar results to the actual flows recorded in the study area. However, few minor assumptions were made in this study. The model can be applied to other areas with similar green structures by changing the parameter values. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9057749
- author
- Ekwu, Emmanuel LU
- supervisor
- organization
- course
- VVAM01 20211
- year
- 2021
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Blue-green stormwater control, Nonlinear reservoir routing model, Stormwater, Modelling, Calibration, Water engineering
- language
- English
- id
- 9057749
- date added to LUP
- 2021-07-15 10:57:43
- date last changed
- 2021-07-15 10:57:43
@misc{9057749,
abstract = {{The increasingly rapid urbanization has led to vast impervious surface areas in the urban environment. This situation of impervious surfaces has increased the surface temperature and interrupted the natural water circle, which has negatively impacted the urban environment. Human activities' continuous greenhouse gas emission has contributed to global climate change, which has caused some atmospheric abnormalities like increased precipitation, leading to environmental hazards like pluvial flooding and combined sewer overflow (CSO). Several different stormwater control measures have been practiced and implemented to control the excess rainfall-runoff and help avoid overloading the drainage systems. Research has proven blue-green infrastructures to be efficient for managing stormwater runoff. However, the techniques for modeling blue-green stormwater systems have also been identified to be very complex and complicated due to the large number of parameters involved. This characteristic has made it challenging to develop simple simulation models to relate the area's physical characteristics where the systems are being implemented.
Hence, this study aimed to develop a simple model with few parameters (corresponding to physical characteristics of the systems) for fast and reliable simulation of blue-green systems. The methodology used in this study was to couple "nonlinear reservoir model" to "hydraulic representation". This quantification and calibration were done in a simple nonlinear reservoir simulation model developed in this study using Excel software. Augustenborg is an area located in Malmö, Sweden, consisting of two main sustainable drainage systems (SuDS) implemented in the North and South of the neighbourhood. This thesis focused on the blue-green stormwater systems in Northern SuDS in Auguestenborg.
The Northern SuDS consists of seven stormwater control measures (SCMs), including swales, wet ponds, and a rectangular channel connected to a sewer pipe network. Each system has a connecting catchment, and the governing equations used in developing the nonlinear reservoir model are the continuity equation and flow equations. The flow equations used in this study are Manning's equation (for swales and rectangular channel) and a discharge equation through an orifice (for wet ponds).
The nonlinear routing parameters were calibrated for each catchment connecting to a system after relating the physical characteristics of the catchments using Manning's equation. After developing the model and obtaining the calibrated parameter values, the model was tested and validated with measured data. The discharge flows from the model were compared to the measured discharge flows.
The model showed a good response time to the discharge flow when validated with measured data. This study developed an easy-to-use physical-based model and was able to quantify nonlinear reservoir routing parameters based on the physical characteristics of the blue-green stormwater systems implemented in the case study.}},
author = {{Ekwu, Emmanuel}},
language = {{eng}},
note = {{Student Paper}},
title = {{A Nonlinear Reservoir Model to Simulate Blue-Green Stormwater Systems – An Application to Augustenborg Catchment in Malmö, Sweden}},
year = {{2021}},
}