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南水北调中线总干渠逆止阀处地下水进入量及其对干渠水质影响分析—以焦作某内排段为例

Keywords: 南水北调中线,内排段,逆止阀,GMS,地下水流量

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Abstract:

为保障南水北调中线总干渠水质安全,以河南焦作某内排段为研究对象,基于GMS地下水数值模拟系统对逆止阀处地下水流向流线、进入量及其对干渠水质影响进行了模拟分析.由8种水量情景模拟结果得出:逆止阀处地下水进入量主要受地下水和总干渠水位差的影响,二者呈正相关.以SO2-4、NH3-N、NO3-N为分析因子,假定总干渠水质类别为Ⅱ类水,通过最差情况分析得出:地下水经逆止阀进入总干渠后,干渠水中SO2-4、NH3-N、NO3-N浓度值均超标,水质类别降为Ⅲ类水.采用逆推法分析得出:当干渠水中SO2-4、NH3-N、NO3-N质量浓度分别不超过221.6768、0.0679、9.0832mg/L时,即便污染的地下水通过逆止阀进入到总干渠,也能保证干渠水符合Ⅱ类水质标准.

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