摘要
含水层中的复合污染物迁移过程主要受水文地质条件和水动力条件影响,为探究复合污染物迁移的影响因素,基于建设的大型地下水试验模拟装置,以甲苯和三氯乙烯为特征污染物,利用GMS建立了地下水流模型和溶质迁移模型,并设置不同情景,模拟不同水文地质条件和水动力条件影响下复合污染物迁移过程;通过敏感性分析,探究关键因素的影响.模拟结果表明三氯乙烯迁移能力大于甲苯,模型运行180 d后,甲苯最大迁移距离为3.5 m,而三氯乙烯最大迁移距离超过6.0 m,且甲苯和三氯乙烯迁移距离与渗透系数和弥散度呈线性正相关,与吸附系数呈线性负相关,即迁移距离随渗透系数和弥散度的增大而增大,随吸附系数的增大而减小.敏感性分析结果表明复合污染物迁移程度的关键影响因素为:渗透系数>弥散度>吸附系数.
The migration process of complex pollutants in aquifers is mainly affected by hydrogeological and hydrodynamic conditions.In order to explore the factors affecting the migration of complex pollutants,toluene and trichloroethylene were used as characteristic pollutants.Groundwater modeling system(GMS)was adopted to establish the groundwater flow model and solute migration model based on large-scale groundwater test device under different scenarios.Then,the migration process of complex pollutants under the influence of different hydrogeological and hydrodynamic conditions was simulated.Meanwhile,the influence of key factors was explored through sensitivity analysis.The simulation results showed that the migration capacity of trichloroethylene was greater than that of toluene.The maximum migration distance of toluene was 3.5 m,while the maximum migration distance of trichloroethylene was more than 6.0 m after 180 days.The migration distances of toluene and trichloroethylene were linearly positively correlated with the permeability and dispersion coefficients,and linearly negatively correlated with the adsorption coefficient,indicating that the migration distances increase with the increase of permeability and dispersion coefficients,and decrease with the increase of adsorption coefficient.The results of sensitivity analysis showed that the most key factor affecting the migration degree of composite pollutants was permeability coefficient,followed by dispersion and adsorption coefficients.
作者
刘洁
鞠天宇
邓圣
肖瀚
韩旭
徐祥健
姜永海
杨昱
LIU Jie;JU Tianyu;DENG Sheng;XIAO Han;HAN Xu;XU Xiangjian;JIANG Yonghai;YANG Yu(College of Water Conservancy and Civil Engineering,Northeast Agricultural University,Harbin,150030,China;State Key Laboratory of Groundwater Pollution Simulation and Control,Chinese Academy of Environmental Sciences,Beijing,100012,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第11期3688-3697,共10页
Environmental Chemistry
基金
黑龙江省自然科学基金优秀青年项目(YQ2021E004)
国家自然科学基金(52000022)
中国博士后科学基金(2022T150105)
黑龙江省博士后科研启动资助(LBH-Q20068)
国家重点研发计划项目(2019YFC1806202)资助.
关键词
有机污染物
数值模拟
敏感性分析
局部分析法
正交试验法
organic contaminant
numerical simulation
sensitivity analysis
local analysis method
orthogonal experiment method
作者简介
通讯作者:杨昱,E-mail:yangyugirl@126.com。
