Optimisation of urban-rural nature-based solutions for integrated catchment water management.
Optimisation of urban-rural nature-based solutions for integrated catchment water management.
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DOI：
10.1016/j.jenvman.2022.117045
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发表时间：
2022-12
影响因子：
8.7
通讯作者：
Leyang Liu;Barnaby Dobson;A. Mijić
中科院分区：
文献类型：
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作者：
Leyang Liu;Barnaby Dobson;A. Mijić
基于自然的解决方案(NBS)在水资源可获得性、水质和洪水管理方面具有共同好处。然而，寻找最佳的城乡一体化国家统计局规划，以在流域范围内最大化共同利益，仍然受到零散评估的限制。这项研究开发了一个基于CatchWat-SD模型的城乡一体化NBS规划优化框架，该框架是为了模拟英国诺福克地区多流域一体化的水循环而开发的。三个农村(径流衰减特征、再生农业、洪泛平原)和两个城市(城市绿地、人工污水湿地)国家BS干预措施在一系列实施尺度上被整合到模型中。建立了一个考虑流量、质量和成本指标的7个水管理目标的多目标优化问题，并采用NSGAII算法搜索最优的NBS投资组合。结果表明，农村国家统计局在流域范围内的影响更为显著，并随着实施规模的扩大而增加。尽管在不同的目标之间存在权衡，但城乡一体化的国家统计局规划可以同时改善水的可获得性、水质和洪水管理。径流衰减特征和洪泛平原为可用水提供了最大的好处。再生农业在水质和洪水管理方面是最有效的，尽管它减少了高达15%的水资源供应，因为它在土壤中保留了更多的水分。通过扩大城市绿地来减少联合下水道系统的负荷是降低磷水平的最佳方法，尽管这与水的可获得性、洪水、氮和悬浮固体之间进行了权衡。拟议的框架能够对国家BS进行空间优先排序，这可能最终指导多方利益攸关方的决策，缩小集水区水管理方面的城乡鸿沟。
Nature-based solutions (NBS) have co-benefits for water availability, water quality, and flood management. However, searching for optimal integrated urban-rural NBS planning to maximise co-benefits at a catchment scale is still limited by fragmented evaluation. This study develops an integrated urban-rural NBS planning optimisation framework based on the CatchWat-SD model, which is developed to simulate a multi-catchment integrated water cycle in the Norfolk region, UK. Three rural (runoff attenuation features, regenerative farming, floodplain) and two urban (urban green space, constructed wastewater wetlands) NBS interventions are integrated into the model at a range of implementation scales. A many-objective optimisation problem with seven water management objectives to account for flow, quality and cost indicators is formulated, and the NSGAII algorithm is adopted to search for optimal NBS portfolios. Results show that rural NBS have more significant impacts across the catchment, which increase with the scale of implementation. Integrated urban-rural NBS planning can improve water availability, water quality, and flood management simultaneously, though trade-offs exist between different objectives. Runoff attenuation features and floodplains provide the greatest benefits for water availability. Regenerative farming is most effective for water quality and flood management, though it decreases water availability by up to 15% because it retains more water in the soil. Phosphorus levels are best reduced by expansion of urban green space to decrease loading on combined sewer systems, though this trades off against water availability, flood, nitrogen and suspended solids. The proposed framework enables spatial prioritisation of NBS, which may ultimately guide multi-stakeholder decision-making, bridging the urban-rural divide in catchment water management.