Lippera Maria Chiara, Khurelbaatar Ganbaatar, Despot Daneish, Kouyi Gislain Lipeme, Rizzo Anacleto, Friesen Jan
Department of Systemic Environmental Biotechnology, Helmholtz Centre for Environmental Research-UFZ, Permoserstrasse 15 04318 Leipzig, Germany.
INSA Lyon, DEEP, UR7429 69621, Villeurbanne, France.
Water Res X. 2024 Nov 22;26:100284. doi: 10.1016/j.wroa.2024.100284. eCollection 2025 Jan 1.
Due to accelerating climate change and the need for new development to accommodate population growth, adaptation of urban drainage systems has become a pressing issue in cities. Questions arise whether decentralised urban drainage systems are a better alternative to centralised systems, and whether Nature Based Solutions' (NBS) multifunctionality also brings economic benefits. This research aims to develop spatio-economic scenarios to support cities in increasing their resilience to urban flooding with NBS. The novelty of our work lies in the automated routines to assess the potential for decentralised NBS within the existing urban catchment. The identification of locations and dimensioning is based on open, publicly available geospatial data. Moreover, a block-based decentralization potential metric is developed to indicate stormwater mitigation potential in any urban setting. The Ecully catchment, Lyon metropolitan area (France), is presented as a case study to achieve zero combined sewer overflow (CSO) for specific design storm events. This planning workflow enables project cost savings through the most suitable allocation of distributed interventions, with cost functions also incorporating scaling effects. By reducing the number of decentralised NBS sites compared to smaller, wide-distributed interventions up to 34 % of project costs are saved when planning for a 5-year design storm and up to 7 % for a 100-year design storm. When the decentralised NBS scenario is analysed alongside other urban stormwater management practices, the centralised constructed wetland for CSO results to be the most economical solution due to the higher retention capacity and scaling effect, significantly outperforming the grey alternatives.
由于气候变化加速以及为适应人口增长而进行新开发的需求，城市排水系统的适应性已成为城市中的一个紧迫问题。人们提出了一些问题，比如分散式城市排水系统是否是比集中式系统更好的选择，以及基于自然的解决方案（NBS）的多功能性是否也能带来经济效益。本研究旨在开发空间经济情景，以支持城市利用基于自然的解决方案提高其对城市内涝的抵御能力。我们工作的新颖之处在于有自动程序来评估现有城市集水区内分散式基于自然的解决方案的潜力。位置的确定和规模的计算基于公开可用的地理空间数据。此外，还开发了一种基于街区的分散潜力指标，以表明在任何城市环境中的雨水缓解潜力。法国里昂大都市区的埃居利集水区被作为案例研究呈现，以实现特定设计暴雨事件下的零合流制下水道溢流（CSO）。这种规划工作流程通过最合理地分配分布式干预措施实现项目成本节约，成本函数还纳入了规模效应。与较小的、广泛分布的干预措施相比，减少分散式基于自然的解决方案的场地数量，在规划5年设计暴雨时可节省高达34%的项目成本，在规划100年设计暴雨时可节省高达7%的项目成本。当将分散式基于自然的解决方案情景与其他城市雨水管理实践一起分析时，由于具有更高的截留能力和规模效应，用于合流制下水道溢流的集中式人工湿地成为最经济的解决方案，显著优于灰色替代方案。
