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。
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.
作者
崔瑜
吴泰然
周磊
周瑞静
杨巧凤
CUI Yu;WU Tairan;ZHOU Lei;ZHOU Ruijing;YANG Qiaofeng(School of Earth and Space Science,Peking University,Beijing 100871,China;Beijing Bureau of Geology,Mineral Exploration and Development,Beijing 100195,China;Beijing Institute of Geological and Prospecting Engineering,Beijing 100048,China;Beijing Institute of Hydrogeology and Engineering Geology,Beijing 100195,China)
出处
《地质通报》
CAS
CSCD
北大核心
2018年第7期1365-1373,共9页
Geological Bulletin of China
基金
北京市自然科学基金项目<变化环境下北京平原区大气降水入渗系数取值研究>(编号:8152012)
关键词
数值模拟
再生水
地下水质
影响
numerical modeling
reclaimed water
groundwater quality
affect
