University of Twente Student Theses
Het mitigeren van stedelijke hittestress door middel van groene infrastructuur : naar een ontwerpstrategie voor de Gemeente Arnhem
Vermeulen, K.R. (2021) Het mitigeren van stedelijke hittestress door middel van groene infrastructuur : naar een ontwerpstrategie voor de Gemeente Arnhem.
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| Abstract: | The Municipality of Arnhem has prepared a climate adaptation design strategy for the period 2020 - 2030 to make the city of Arnhem resilient and resistant to extreme weather. One aspect of this is to mitigate urban heat stress which will become a greater problem with more frequent or extreme heat waves. One proposed measure is the placement of more urban green infrastructure. Urban green infrastructure in this study refers to grass, hedges & shrubs, trees, green roofs and green facades. Scientific studies confirm the ability of urban green infrastructure to reduce urban heat stress and improve thermal comfort. When placing more urban green infrastructure, it is often not fully known how the placement of urban green infrastructure can reduce heat stress as effective as possible and what the resulting quantified effect of this is. This research therefore aims to design a design strategy for urban green infrastructure on behalf of the municipality of Arnhem, commissioned and supervised by Sweco, entirely focused on mitigating heat stress. Each step in the design strategy is therefore aimed at the most optimal heat stress mitigation. The design strategy was applied to the heat stress sensitive neighborhood Kronenburg in Arnhem and the resulting design was tested for its quantified effect on heat stress. The design strategy was designed using an iterative design research method with only one research goal: Design an urban green infrastructure design strategy aimed at mitigating urban heat stress as effectively as possible. The design research method consists of three iterative components: problem exploration, design, and validation. The problem exploration section examined for whom, why, and how a design strategy for urban green infrastructure might add value. Then, in the design section, design requirements were set based on the results of the problem exploration, and this was used to design the design strategy. For validation, the design requirements were validated and the usability of the design strategy for the target group was examined through an interview. It can be concluded that a design strategy specifically aimed at effective mitigation of urban heat stress is lacking among the target group such as municipalities, the municipality of Arnhem as the primary target group in this study, consultancies and architectural firms. It was found that recently there is much more knowledge to be found in scientific literature about the effectiveness of various green measures, but this is only translated for a limited extent into useful knowledge for urban design. The found knowledge about effectiveness and the influence of shape complexity, fragmentation and ventilation on heat stress mitigation by urban green infrastructure was integrated into the design strategy together with a priority framework and design guidelines. Applying the design strategy decreased average heat stress within the design area. In particular, trees with large tree canopies significantly reduced heat stress by creating shade. However, it does appear that the design strategy is primarily suitable as a set of guidelines/checklist for effectively mitigating heat stress with urban green infrastructure. As a checklist or set of guidelines, the design strategy will not be followed step by step because in public space design there are other goals and interests than only heat stress mitigation. Analyzing heat stress in the design area as part of the design strategy during the design process helps to make better tradeoffs during design and effective heat stress mitigation. Furthermore, the design strategy can contribute to communication when selling a urban green infrastructure design because the effect on heat stress can be better communicated or demonstrated. |
| Item Type: | Essay (Bachelor) |
| Faculty: | ET: Engineering Technology |
| Programme: | Civil Engineering BSc (56952) |
| Link to this item: | https://purl.utwente.nl/essays/85933 |
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