基于GMS的平原区浅层地下水潜在硝酸盐点源污染预测研究-以秦皇岛为例*

Prediction of potential nitrate point pollution in shallow groundwater in Plain area based on GMS-a case study of Qinghuangdao

  • 摘要: 为研究秦皇岛平原区浅层地下水中硝酸盐污染潜在发展动态,本文利用GMS构建地下水水流与溶质迁移耦合模型,对地下水中硝酸盐潜在点源在未来20年间的迁移和污染风险进行预测,探讨了切断污染源的不同时间情境对水源地的污染影响.结果表明,构建的地下水流动模型和36个野外统测数据拟合较好,能够反映区域地下水流动情况;浅层地下水中硝酸盐污染羽主延伸方向从西北向东南沿海扩散;水源地的地下水开采影响了局部地下水流动方向,昌黎县后孟营水源地存在较显著的污染风险;此外,研究发现切断污染源后,迁移和稀释的过程是缓解后孟营水源地硝酸盐污染风险的主要因素,及时切断污染源能够有效降低污染风险.本研究有助于秦皇岛地下水硝酸盐污染防治.

     

    Abstract: In order to study the potential development trend of nitrate pollution in the shallow groundwater of Qinhuangdao Plain area, a coupling model of groundwater flow and solute transport was constructed using GMS based on hydrogeology and measured data. The migration and pollution risk of nitrate in groundwater under potential point source pollution in the next 20 years was predicted. And the different scenarios of cutting off pollution sources were discussed.The results show that the shallow groundwater model was well fitted to 36 field data and can reflect the regional groundwater flow. The main extension direction of nitrate pollution plume in shallow groundwater was spreading from northwest to southeast coast. The local groundwater flow direction was influenced by the exploitation in the groundwater source and resulted in the significant pollution risk in Houmengying groundwater source in Changli County. In addition, it was found that the migration and dilution processes were the main factors to reduce the risk of nitrate pollution in groundwater sources. And the timely cutting off pollution sources could effectively reduce the pollution risk. This study is helpful to the prevention and control of nitrate pollution of groundwater in Qinhuangdao.

     

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