Abstract：
Flooding is expected to increase due to climate change, urbanisation, and land use change. To address this issue, Nature-Based Solutions (NBSs) are often adopted as innovative and sustainable flood risk management methods. Besides the flood risk reduction benefits, NBSs offer co-benefits for the environment and society. However, these co-benefits are rarely considered in flood risk management due to the inherent complexities of incorporating them into economic assessments. This research addresses this gap by developing a comprehensive methodology that integrates the monetary analysis of co-benefits with flood risk reduction in economic assessments. In doing so, it aspires to provide a more holistic view of the impact of NBS in flood risk management. The assessment employs a framework based on life-cycle cost-benefit analysis, offering a systematic and transparent assessment of both costs and benefits over time supported by key indicators like net present value and benefit cost ratio. The methodology has been applied to the Tamnava basin in Serbia, where significant flooding occurred in 2014 and 2020. The methodology offers valuable insights for practitioners, researchers, and planners seeking to assess the co-benefits of NBS and integrate them into economic assessments. The results show that when considering flood risk reduction alone, all considered measures have higher costs than the benefits derived from avoiding flood damage. However, when incorporating co-benefits, several NBS have a net positive economic impact, including afforestation/reforestation and retention ponds with cost-benefit ratios of 3.5 and 5.6 respectively. This suggests that incorporating co-benefits into economic assessments can significantly increase the overall economic efficiency and viability of NBS.
摘要：
由于气候变化，预计洪水将增加，城市化,和土地利用变化。为了解决这个问题，基于自然的解决方案（NBS）通常被用作创新和可持续的洪水风险管理方法。除了减少洪水风险的好处，NBS为环境和社会提供共同利益。然而,由于将这些共同利益纳入经济评估的固有复杂性，因此在洪水风险管理中很少考虑这些共同利益。这项研究通过开发一种综合方法来解决这一差距，该方法将经济评估中的共同利益与洪水风险降低的货币分析相结合。在这样做的时候，它希望对NBS在洪水风险管理中的影响提供更全面的看法。评估采用基于生命周期成本效益分析的框架，提供一个系统的和透明的成本和效益随着时间的推移由关键指标，如净现值和效益成本比率支持的评估。该方法已应用于塞尔维亚的Tamnava盆地，2014年和2020年发生了严重的洪水。该方法为从业者提供了宝贵的见解，研究人员,和规划者寻求评估国家统计局的共同利益，并将其纳入经济评估。结果表明，当单独考虑洪水风险降低时，所有考虑的措施的成本都高于避免洪水破坏所带来的收益。然而,当纳入共同福利时，几个国家统计局产生了净积极的经济影响，包括造林/再造林和保留池，成本效益比分别为3.5和5.6。这表明，将共同效益纳入经济评估可以显着提高国家统计局的整体经济效率和生存能力。
