基于数值模拟的再生水对地下水质影响实例[J]. 地质通报, 2018, 37(7): 1365-1373. DOI: 10.12097/j.issn.1671-2552.2018.07.020
    引用本文: 基于数值模拟的再生水对地下水质影响实例[J]. 地质通报, 2018, 37(7): 1365-1373. DOI: 10.12097/j.issn.1671-2552.2018.07.020
    A case study on effect of reclaimed water on underground water quality based on numerical simulation[J]. Geological Bulletin of China, 2018, 37(7): 1365-1373. DOI: 10.12097/j.issn.1671-2552.2018.07.020
    Citation: A case study on effect of reclaimed water on underground water quality based on numerical simulation[J]. Geological Bulletin of China, 2018, 37(7): 1365-1373. DOI: 10.12097/j.issn.1671-2552.2018.07.020

    基于数值模拟的再生水对地下水质影响实例

    A case study on effect of reclaimed water on underground water quality based on numerical simulation

    • 摘要: 为了探讨在再生水地表回灌条件下,再生水对地下水中氨素和主要盐分浓度变化的影响,选取现实存在的清河再生水湿地公园为例,以氨氮、Cl-离子为主要研究对象,利用Hydrus-1D溶质运移模型和Modflow、MT3DMSD耦合地下水模型,模拟了再生水长期利用后的地下水氨氮和Cl-指标变化情况。研究结果显示,再生水到达包气带底部时,水中氮氨、Cl-离子含量高于研究区潜水地下水中的相应指标含量,氨氮超出地下水质量Ⅲ类标准。预测5~20年后,潜水中氨氮超标面积不断扩展,20年后将达14km2,氨氮超标垂向延伸至第一层弱透水层;Cl-离子在潜水中不超标,但在湿地公园周边浓度有所增加。湿地公园再生水的长期地表回灌将给当地地下水质量带来负面影响。

       

      Abstract: This study aimed to explore the effect of reclaimed water on the changes of ammonia and main salinity concentration in groundwater. Qinghe reclaimed water wetland park was chosen as a case, ammonia nitrogen and Cl-ion are the main research object, using Hydrus-1D solute transport model and coupling groundwater model of Modflow and MT3DMS, the change of ammonia nitrogen and Cl- index after the long-term utilization of reclaimed water was simulated. At the bottom of vadose zone, the content of nitrogen ammonia and Cl- ion in reclaimed water was higher than that of phreatic groundwater in the research area, ammonia nitrogen was beyond groundwater quality Ⅲ class standard. The coupling model prediction results suggested that concentration area of ammonia nitrogen exceeding the groundwater quality standard would has expanded constantly 5~20 years later in the horizontal direction, and has extended vertically to the first layer of weak permeable layer; the Cl- ion concentration would not exceeding the quality standard but has increased in phreatic groundwater surrounding the wetland park. So the long-term reinjection of the reclaimed water in wetland park will have a negative impact on the local groundwater quality.

       

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