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Improvement and effect evaluation of river network water environment in China International Import Expo area
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摘要: 首届中国国际进口博览会于2018年11月在上海市国家会展中心举办，区域河网动力弱、入河污染负荷强，周边河道小涞港于2017年刚脱离黑臭，亟需提升区域水环境。采用数值模拟与现场试验运行相结合的方法，开展水环境提升方案研究。针对进博会及周边区域水质差、水体浑浊、水动力弱等问题，采用控源截污、生态修复、活水畅流等措施，新建3座装配式溢流堰，形成三级水位和活水循环的水网动力格局，促进了进博会区域循环净水-生态修复的良性循环。运行监测结果表明，核心区小涞港透明度大于1.5 m，重点区大于1.2 m，主要水质指标由Ⅴ～劣Ⅴ类提升至Ⅱ～Ⅲ类。运行评估结果表明，控源截污对水质提升起主要作用，贡献占比73%；活水畅流与生态修复对水质提升贡献占比分别为15%和12%。Abstract: The 1st China International Import Expo (CIIE) was held in National Exhibition and Convention Center (NECC), Shanghai, in November 2018. The hydrodynamics of river network in CIIE area is weak, and the pollution discharge into river is heavy, especially the Xiaolaigang river just divorced from malodorous black in 2017. It’s quite essential to improve the water enviromment in CIIE Area. Water enviromment improvement schemes were studied based on numerical simulation and field test. Pollution intercepting, ecological restoration and hydrodynamic improvement were adopted to slove the problem of bad water quality, water turbidity and weak hydrodynamics in CIIE area. Three fabricated downflow weirs were built to form cascade water level and water circulation, promoting the ecological restoration and hydrodynamic improvement. The result of operation monitoring indicated that the transparency of the Xiaolaigang river core area was greater than 1.5 m, and the transparency of key area was greater than 1.2 m. Main water quality indicator was promoted from Ⅴ- exceed Ⅴ to Ⅱ-Ⅲ. Effect evaluation indicated that pollution intercepting played an important role in water environment improvement, about 73% proportion. The proportion of hydrodynamic improvement and ecological restoration in water environment improvement was about 15% and 12%.
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图 1 区域排污口分布与雨水强排泵站位置
Figure 1. Distribution of sewage outlets and location of drainage pump station in CIIE area
图 2 徐泾站2007—2017年10月15日—11月15日降雨次数与最大降雨量
Figure 2. Rainfall days and maximum rainfall of Xujing station from October 15 to November 15, 2007 to 2017
图 4 模型内部验证点水位实测值与计算值对比
Figure 4. Comparison of the measured and calculated water levels at the internal verification point of the model
图 5 首届进博会前后小涞港水质随时间变化
Figure 5. Variation of Xiaolaigang river water quality with time before and after the first CIIE
图 6 小涞港氨氮与降雨量随时间变化
Figure 6. Variation of NH3-N and rainfall with time of Xiaolaigang river
图 7 小涞港及徐泾镇总体水质变化
Figure 7. Overall water quality variation of Xiaolaigang river and Xujing town
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