基于Visual MODFLOW的天化试剂一厂地下水污染物扩散数值分析
Numerical Study on Groundwater Pollutant Dispersion in Tianjin First Chemical Reagent Factory Based on Visual MODFLOW
王鹏 1周世冲 1张檑 1贾沼霖2
作者信息
- 1. 天津市勘察设计院集团有限公司,天津 300191
- 2. 河北工程大学 水利水电学院,河北 邯郸 056038
- 折叠
摘要
为了给城市污染场地的修复和治理提供依据,以天津市化学试剂一厂地块修复项目为例,利用三维模拟软件Visual MODFLOW建立地下水水流概念模型和溶质迁移模型,对风险管控区内氯乙烯等三种污染物进行20 年的运移扩散数值模拟预测,并对其运移过程和分布特征进行分析.结果表明:污染物的运移除了自身的衰减、弥散和吸附等作用外,主要受地下水运动趋势的影响,随着地下水的流向进行扩散,受止水帷幕阻隔的影响,污染物在迁移扩散过程中发生了明显的"绕流现象".垂直渗透系数较小的相对隔水层对污染晕的垂直扩散阻隔作用明显,浅部含水层中污染物浓度梯度随深度的增加而明显减小.三种污染物浓度均明显低于修复目标控制值.利用Visual MODFLOW建立地下水数值模型,可以预测污染物因子时空分布,定性的分析各种污染物的运移规律.
Abstract
In order to provide a basis for the remediation and treatment of urban contaminated sites,taking the restora-tion project of Tianjin First Chemical Reagent Factory as an example,Visual MODFLOW,a three-dimensional ground-water flow simulation software was adopted to establish the conceptual model of groundwater flow and solute transport model,predict the migration and diffusion of groundwater pollutants on the east and south sides of the field.The migra-tion process and distribution characteristics are investigated by numerical simulation.The results are as follows.In ad-dition to its attenuation,dispersion and adsorption,the migration of pollutants is mainly affected by the trend of groundwater.Affected by the barrier of the waterproof curtain on the east and south sides of the field area,the pollutant has obvious flow around during the migration and diffusion process.The vertical diffusion barrier effect of the relative aquifuge with smaller vertical permeability coefficient on the pollution halo is obvious.The vertical concentration gradi-ent of pollutants in the shallow aquifer is large,and the concentration gradient decreases significantly with the increase of depth.The concentration of the three pollutants was significantly lower than the control value of the remediation tar-get.Using Visual MODFLOW to establish groundwater numerical model,it can predict the spatial and temporal distri-bution of pollutant factors and qualitatively analyze the transport law of various pollutants.
关键词
Visual/MODFLOW/溶质运移模拟/污染场地修复/数值模拟Key words
Visual MODFLOW/solute transport simulation/contaminated site remediation/numerical simulation引用本文复制引用
基金项目
国家重点研发计划(2023YFC3209402)
出版年
2024
NETL
NSTL
维普
万方数据