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Cost-Effectiveness Analysis of Green-Gray Stormwater Control Measures for Non-Point Source Pollution

机译：非点源污染绿灰雨水控制措施的成本效益分析

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摘要

The control of non-point source pollution (NPS) is an essential target in urban stormwater control. Green stormwater control measures (SCMs) have remarkable efficiency for pollution control, but suffer from high maintenance, operation costs and poor performance in high-intensity rainfall events. Taking the Guilin Road subwatershed in Rizhao, China, as a case study, a scheme for coupling gray and green stormwater control measures is proposed, and the gray SCMs are introduced to compensate for the shortcomings of green SCMs. The System for Urban Stormwater Treatment and Analysis Integration (SUSTAIN) model was employed to investigate the cost-effectiveness of three scenarios (green SCMs only, gray SCMs only, and coupled green-gray SCMs). The results show that the optimal solutions for the three scenarios cost USD 1.23, 0.79, and 0.80 million, respectively. The NPS control ability of the coupled green-gray scenario is found to be better than that of the other two scenarios under rainfall events above moderate rain. This study demonstrates that coupled green-gray stormwater control management can not only effectively control costs, but can also provide better pollution control in high-intensity rainfall events, making it an optimal scheme for effective prevention and control of urban non-point source pollution.
机译：非点源污染（NPS）的控制是城市雨水控制的重要目标。绿色雨水控制措施（SCM）对污染控制具有显着效率，但遭受高维护，运营成本和高强度降雨事件的性能差。以桂林路副行者为例，为例，提出了一种耦合灰色和绿色雨水控制措施的方案，引入了灰色SCM来弥补绿色SCM的缺点。采用了城市雨水处理和分析整合（维持）模型的系统来调查三种情况的成本效益（仅限绿色SCM，仅灰色SCM和耦合绿色灰色SCM）。结果表明，三种情况的最佳解决方案分别为1.23,0.79和0.80万美元。发现耦合的绿色灰色情景的NPS控制能力比中等雨水的降雨事件下的其他两种情景更好。本研究表明，耦合的绿色灰尘防治管理不仅可以有效地控制成本，而且还可以在高强度降雨事件中提供更好的污染控制，使其成为有效预防和控制城市非点源污染的最佳方案。

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