Assessment of pluvial flooding at Mossen

Typ
Examensarbete för masterexamen
Master's Thesis
Program
Infrastructure and environmental engineering (MPIEE), MSc
Publicerad
2024
Författare
Börjesson, Hanna
Pettersson, Elin
Modellbyggare
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Sammanfattning
With the increased severeness of urban pluvial flooding due to climate change, cities have to increase their resilience against heavy cloudbursts. As a response to the upcoming challenges an interim target for all Swedish municipalities is to investigate and integrate sustainable stormwater management when planning new construction as well as existing stock. The city of Gothenburg is no exception, and in the structural plan the municipality presents several potential cloudburst surfaces, with the football field Mossens IP being one of them. The aim of this thesis was to investigate the resilience of the football field against a 100-year rain, and whether it is possible to mitigate the consequences at site through Nature-based solutions simultaneously as the area benefits socially and environmentally through increased recreational value and eco-system services. Further, the potential effect of flooding on the possibility for sport associations to utilize the field was investigated. The thesis was scenario-based and applied three different scenarios. Scenario 1 was used as a baseline scenario, thus representing the current flooding situation during a 100-year rain at Mossen football field if no changes were made, whereas Scenario 2 involved Nature-based solutions e.g. rain gardens, green roofs, blue-green roofs and permeable paving within the catchment area. Lastly, Scenario 3 involved storage focused solutions, e.g. retention ponds and detention basins within the catchment area. Modelling was conducted in SCALGO Live and thereafter analyzed with the decision making framework MCDA. The study concluded that the nature-based solutions implemented in Scenario 2 are not preferred in this case from a strictly quantitative stormwater management point of view, as no notable reduction in flooding of the field was found. In this case study, the most beneficial stormwater solutions proved to be the detention basins in Scenario 3 with a total reduction of 23 cm. However, both scenarios performed well regarding increasing recreational values and eco-system services. Rain gardens and a multi-functional detention basin were found to be the most optimal ones
Beskrivning
Ämne/nyckelord
Blue-Green solutions , Climate change , Cloudburst , MCDA , Nature-Based Solutions , Stormwater management , Stormwater modelling , Urban flooding
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