Department of Environmental Engineering and Water Technology, IHE-Delft, Westvest 7, 2611 AX Delft, the Netherlands; Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, the Netherlands.
Department of Environmental Engineering and Water Technology, IHE-Delft, Westvest 7, 2611 AX Delft, the Netherlands.
Sci Total Environ. 2020 Feb 10;703:134980. doi: 10.1016/j.scitotenv.2019.134980. Epub 2019 Nov 2.
Climate change is presenting one of the main challenges to our planet. In parallel, all regions of the world are projected to urbanise further. Consequently, sustainable development challenges will be increasingly concentrated in cities. A resulting impact is the increment of expected urban flood risk in many areas around the globe. Adaptation to climate change is an opportunity to improve urban conditions through the implementation of green-blue infrastructures, which provide multiple benefits besides flood mitigation. However, this is not an easy task since urban drainage systems are complex structures. This work focuses on a method to analyse the trade-offs when different benefits are pursued in stormwater infrastructure planning. A hydrodynamic model was coupled with an evolutionary optimisation algorithm to evaluate different green-blue-grey measures combinations. This evaluation includes flood mitigation as well as the enhancement of co-benefits. We confirmed optimisation as a helpful decision-making tool to visualise trade-offs among flood management strategies. Our results show that considering co-benefits enhancement as an objective boosts the selection of green-blue infrastructure. However, flood mitigation effectiveness can be diminished when extra benefits are pursued. Finally, we proved that combining green-blue-grey measures is particularly important in urban spaces when several benefits are considered simultaneously.
气候变化是我们星球面临的主要挑战之一。与此同时，预计世界所有地区将进一步城市化。因此，可持续发展的挑战将越来越集中在城市。其结果是，预计在全球许多地区的城市洪水风险将会增加。适应气候变化是通过实施绿色-蓝色基础设施来改善城市条件的机会，这些基础设施除了减轻洪水灾害外，还提供了多种好处。然而，这并非易事，因为城市排水系统是复杂的结构。本工作重点介绍了一种在雨水基础设施规划中追求不同效益时进行权衡分析的方法。将水动力模型与进化优化算法耦合，以评估不同的绿色-蓝色-灰色措施组合。该评估包括洪水缓解以及增强的共同效益。我们确认了优化作为一种有用的决策工具，可用于可视化洪水管理策略之间的权衡。我们的结果表明，将增强共同效益作为目标来考虑可以提高绿色-蓝色基础设施的选择。然而，当追求额外的效益时，洪水缓解的效果可能会降低。最后，我们证明了在同时考虑多个效益时，在城市空间中结合绿色-蓝色-灰色措施是特别重要的。
