基于数值模型的场地地下水污染风险评价方法研究

Study on the evaluation of groundwater pollution risk based on numerical model for contaminated site

地下水污染风险评价是开展场地风险管控工作的基础,目前针对场地地下水污染风险研究多侧重于健康风险,较少关注地下水受污染的风险。为完善场地地下水污染风险评价技术方法体系,本研究针对地表污染物迁移至含水层、污染物在含水层中迁移过程,基于数值模型开展了地下水受污染风险、含水层内污染物迁移的风险评价研究。以我国某造纸厂场地为例,建立了溶质在包气带和含水层中运移的数值模型,评估了该场地地下水污染风险。结果表明,该场地内包气带防污性能较差,地下水受污染的风险很高;含水层内污染物随地下水迁移扩散,并造成场地下游地表水体污染的风险较高。研究成果可为场地地下水污染风险管控提供科技支撑。

Risk assessment of groundwater pollution is the basis for groundwater pollution management and control.The research of pollution risk at contaminated sites pay more attention on the health risk than the pollution risk of groundwater.In order to improve the risk evaluation technical method system of groundwater pollution,the migration process of pollutant in the vadose zone and aquifer was analyzed,and the risk evaluation of groundwater pollution and pollutant migration in the aquifer was carried out by the numerical model.The contaminated site of a paper mill was chosen as the study area in this research.The numerical model of the pollutant migration in the vadose zone and aquifer at the contaminated site was established,and the groundwater pollution risk was evaluated.The evaluation results show that the groundwater vulnerability pollution risk of the site is high,and the river has high pollution risk for the migration of pollutant in the groundwater.The research results could provide a scientific support for management and control of groundwater pollution risk.