Assessing the Co-Benefits of green-blue-grey infrastructure for sustainable urban flood risk management

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:239

Article

Alves, Alida¹  Gersonius, Berry²  Kapelan, Zoran^3,4  Vojinovic, Zoran¹  Sanchez, Arlex¹ 

[1] IHE Delft, Dept Environm Engn & Water Technol, Delft, Netherlands

[2] IHE Delft, Dept Water Engn, Delft, Netherlands

[3] Univ Exeter, Coll Engn, Ctr Water Syst, Exeter, Devon, England

[4] Delft Univ Technol, Fac Civil Engn & Geosci, Dept Water Management, Delft, Netherlands

关键词: Sustainable urban drainage;    Green-blue-grey infrastructure;    Flood risk management;    Co-benefits valuation;    Decision making;    Cost-benefits analysis;   

DOI  :  10.1016/j.jenvman.2019.03.036

来源: Elsevier

【 摘 要 】

Green-blue infrastructures in urban spaces offer several co-benefits besides flood risk reduction, such as water savings, energy savings due to less cooling usage, air quality improvement and carbon sequestration. Traditionally, these co-benefits were not included in decision making processes for flood risk management. In this work we present a method to include the monetary analysis of these co-benefits into a cost-benefits analysis of flood risk mitigation measures. This approach was applied to a case study, comparing costs and benefits with and without co-benefits. Different intervention strategies were considered, using green, blue and grey measures and combinations of them. The results obtained illustrate the importance of assessing co-benefits when identifying best adaptation strategies to improve urban flood risk management. Otherwise green infrastructure is likely to appear less efficient than more conventional grey infrastructure. Moreover, a mix of green, blue and grey infrastructures is likely to result in the best adaptation strategy as these three alternatives tend to complement each other. Grey infrastructure has good performance at reducing the risk of flooding, whilst green infrastructure brings in multiple additional benefits that grey infrastructure cannot offer.

【 授权许可】

Free