含低渗透镜体包气带典型LNAPL迁移分布模拟研究  

Numerical investigation on migration and distribution of a typical LNAPL in the vadose zone with low permeability lens

作　　者：穆童 王明玉 王月[3] MU Tong;WANG Mingyu;WANG Yue(College of Mining,Liaoning Technical University,Fuxin 123000,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]中国科学院大学资源与环境学院,北京100049 [3]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012

出　　处：《安全与环境工程》2024年第6期189-199,共11页Safety and Environmental Engineering

基　　金：国家重点研发计划重点专项项目(2020YFC1807100)。

摘　　要：针对地下油品储运设施少量短时泄漏问题,选取甲基叔丁基醚(methyl tert-butyl ether,MTBE)作为典型轻质非水相液体(light non-aqueous phase liquid,LNAPL),通过物理试验和数值模拟方法,选取LNAPL的迁移时间及其滞留在透镜体内的质量等作为迁移分布特征变量,研究了MTBE在含低渗透镜体的多孔介质包气带内的迁移过程及其在透镜体内的滞留分布情况,并通过对模拟数据统计分析,识别出了各特征变量的主控因子。结果表明:MTBE遍历包气带所需时间不仅受包气带水动力参数的影响,还受其厚度的控制;而透镜体内滞留的MTBE质量主要受到基质和透镜体的水动力参数以及透镜体体积的影响;各特征变量与其相关因子之间具有良好的幂函数乘积统计关系。本研究可为LNAPL泄漏事件中的应急管理和污染防控提供预测模型的参考和研究方法的借鉴。With aiming at the problem of a small amount and short-term leakage in underground oil pipelines and oil storage tanks,methyl tert-butyl ether(MTBE)was selected as a typical Light Non-Aqueous Phase Liquid(LNAPL).Through physical model experiments and numerical simulations,the migration of MTBE in the vadose zone of porous media containing low-permeability lenses,as well as the retention in the lens were investigated.The time for LNAPL to migrate and the mass of LNAPL that remains in the lens were selected as the specific characteristic factors.Through statistical analysis of the simulation data,the dominant factors of each characteristic variable were identified,which indicates that the time required for MTBE to traverse the vadose zone is not only affected by hydrodynamic parameters of the vadose zone,but also controlled by its thickness;the quality of MTBE retained in the lenses is mainly affected by the hydrodynamic parameters of the matrix and lenses,as well as the volume of the lenses.The investigation results show that there is a good power function product statistical relationship between each of the characteristic factors and its related factors.This work will provide a reference for predictive models and research methods in emergency management and pollution prevention and control in LNAPL typical pollutant leakage events in the contaminated sites or areas.

关 键 词：MTBE LNAPL 包气带 低渗透镜体 砂柱试验 

分 类 号：X523[环境科学与工程—环境工程]