Defining boundary conditions and bathymetries can pose important challenges for the modeller. Apart from being important in itself, it also forms the basis for a number of other tasks, such as sediment transport simulations, different kinds of spreading and dispersion studies and studies of water quality or ecological systems. The overall objective of the output from model is to provide an integrated planning and management tool to allow cost effective management for urban drainage systems.Hydrodynamic modelling is central in most modelling tasks in the marine area. The findings from this model can be used for development of a comprehensive urban flood management plan of Gothenburg. Flood maps with maximum water level have been generated and presented in the study. The model results provide spatial flood risk information such as water depth and flow velocity during flooding and can be used to evaluate the effectiveness of flood protection practices in central Gothenburg. The developed two-dimensional model shows that the parts of the study area including the canals, the streets and the space in between the residential buildings would be flooded if the drainage system is blocked due to extreme precipitation.
The model simulates unsteady flooding and drying processes over the urban areas. For the Manning number, two cases were considered: in the first case, a constant value of the Manning number was assumed over the entire computational grid and in the second case, a land use map was used with different Manning numbers for buildings, roads, parks and water. The topography data is first processed in ArcGIS so that it can be further used in MIKE 21.Then, a bathymetry for the area is created in MIKE 21 considering boundary layers and other parameters including land value. This was then used to simulate 2-D overland flow in the catchment to develop, implement and verify the model approach in urban areas. The model was developed by using topographical data and fine time resolution precipitation data. This was followed by development of flood risk maps. In this paper, a two dimensional (2-D) hydrodynamic simulation model using MIKE 21 was developed as a tool to simulate stormwater related flooding in the central part of Gothenburg. However, the cost associated with floods in the cities is very high due to high property and infrastructure value and the high economical activity. In addition, the lack of space limits the availability of infiltration areas. Designing a stormwater system for an extreme rainfall is impossible due the high cost. At the same time, space limitations and cost considerations prevent the development of an optimized drainage system. Studies have shown an increase of the extreme precipitation in Gothenburg, Sweden. (More) Climate change has affected the extreme weather throughout the world. In this paper, a two dimensional (2-D) hydrodynamic simulation model using MIKE 21 was developed as a tool to simulate stormwater related flooding in the central.
Urban Flooding in Gothenburg - A MIKE 21 Studyĭivision of Water Resources Engineering Abstract Climate change has affected the extreme weather throughout the world.