王东东, 秦大军, 孙杰, 等.2020.北京怀柔地区入渗河水空间分布研究[J].工程地质学报, 28(6):1474-1482.doi: 10.13544/j.cnki.jeg.2019-316.
    引用本文: 王东东, 秦大军, 孙杰, 等.2020.北京怀柔地区入渗河水空间分布研究[J].工程地质学报, 28(6):1474-1482.doi: 10.13544/j.cnki.jeg.2019-316.
    Wang Dongdong, Qin Dajun, Sun Jie, et al.2020.The distribution of river infiltrated into shallow porous aquifers in Huairou area, Beijing[J].Journal of Engineering Geology, 28(6):1474-1482.doi: 10.13544/j.cnki.jeg.2019-316.
    Citation: Wang Dongdong, Qin Dajun, Sun Jie, et al.2020.The distribution of river infiltrated into shallow porous aquifers in Huairou area, Beijing[J].Journal of Engineering Geology, 28(6):1474-1482.doi: 10.13544/j.cnki.jeg.2019-316.

    北京怀柔地区入渗河水空间分布研究

    THE DISTRIBUTION OF RIVER INFILTRATED INTO SHALLOW POROUS AQUIFERS IN HUAIROU AREA, BEIJING

    • 摘要: 河水入渗路径和范围对确定地下水补给条件,以及水资源调控和合理利用有着重要意义。针对2015年以来怀柔地区地下水水位回升现象,开展了地下水动态影响因素研究,采集了河水和地下水样品,测试了水化学和氢氧稳定同位素组成。δD-δ18 O数据表明该区有河水入渗补给地下水,河流附近地下水为地下水与入渗河水的混合物。利用地下水δ18O值以及二元混合模型计算了地下水中入渗河水的比例,揭示出地下水中河水占比减小方向与地下水水力梯度下降方向一致;局部河段附近地下水Cl-含量增加,表明河水入渗会引起地下水水质变化。入渗河水影响范围的圈定为评价入渗河水对地下水的影响提供了重要数据。该项工作对理解研究区地下水水文过程、控制因素以及水资源管理具有指导意义。

       

      Abstract: The interaction of river and groundwater is critical for understanding recharge and water quality for porous aquifer in the mountain front area, Huairou, Beijing. In this area groundwater level was greatly dropped due to heavy abstraction before the year of 2013, and alleviated from 2015 by the arrival and input of Yangtze River water under the south to north water division project. Transported river water could increasingly play roles for recharge into aquifers and help to restore groundwater storage. River and groundwater samples were taken from Huairou area and measured major ions and δD-δ18O to investigate the distribution of river infiltrated into shallow porous aquifers for understanding of effects on groundwater quality. The results demonstrate that:(1)δD-δ18O data indicate along river banks groundwater is a mixture with river water where the infiltrated river water has the signal of enriched oxygen-18. Consequently, a binary mixed model was established according to the balance of δ18O between two mixing components and used to estimate the fraction of infiltrated river water. Based on the spatial variation in δ18O values of groundwater near banks of rivers and estimated fraction of river water in the river and groundwater mixture, the area of river water infiltration was delineated; (2)Cl- was taken as conservative tracer to reveal groundwater quality influenced by the river water infiltration. Groundwater Cl- is closely related to Cl- in river waters and unsaturated zone soils and can be used to assess the variation of quality in groundwater with the infiltration of river water. This work will benefit for evaluating river and groundwater interaction and water resources management.

       

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