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再生水是干旱和半干旱地区河流重要生态水源之一,但其高营养盐含量极易导致河流发生富营养化,严重影响河流水生态安全。以再生水补给型城市河流北京市凉水河为例,构建基于MIKE11的水动力水质耦合模型,应用实测水文水质数据率定和验证河流水质模型参数。结合区域污染源特征设定不同情境方案,并通过模型模拟分析不同方案下水质改善效果响应关系。结果表明:点源污染截流是改善凉水河水质的关键,可降低大红门闸断面氨氮浓度51.8%、TP浓度43.3%,其次为污水处理厂系统完善、生态河道建设和降雨面源控制。该研究提出在包括上述4项在内综合治理措施下,水质改善效果最为显著,大红门闸断面氨氮和TP年均浓度分别为0.969 mg/L和0.214 mg/L,满足地表水Ⅳ类水体标准。
Reclaimed water is one of the most important ecological water sources in arid and semi-arid rivers. However, its high nutrient content can easily lead to eutrophication of the rivers and seriously affect the ecological safety of rivers. Take the Liangshui River in Beijing city as an example, a model of MIKE11-based hydrodynamics and water quality coupling is constructed. The measured hydrological and water quality data are used to calibrate and validate the river water quality model parameters. According to the characteristics of regional pollution sources, different scenarios were set up, and the relationship between water quality improvement and response under different scenarios was analyzed by model simulation. The results showed that the point source pollution interception was the key point to improve the water quality of Liangshui River, which could reduce the concentration of ammonia nitrogen and the concentration of TP by 43.8% and 51.8% respectively. The second was the improvement of sewage treatment plant system, the construction of ecological watercourse and the control of rainfall surface source. The study proposed that the water quality improvement effect is the most significant under the comprehensive management measures including the above four items. The annual average concentration of ammonia nitrogen and TP in Dahong gate sections are 0.969 mg / L and 0.214 mg / L respectively, which meets the requirements of surface water class IV water body .