摘要
断层作为地质构造的重要组成部分,通过改变地下水流动路径、渗透性分布和溶质运移机制,显著影响污染物在地下水系统中的扩散范围和速度,然而国内外针对断层对垃圾填埋场地下水污染迁移模拟的研究尚不多见。基于GMS软件构建了包含断层渗透性的地下水流和溶质运移模型,开展了不同工况及断层渗透性增强下垃圾填埋场特征污染物渗漏对地下水环境和输水隧洞的影响模拟。模拟结果表明:在正常工况下,由于厂区底部防渗措施,污染物扩散范围基本限于厂区内部,且污染物中心最高质量浓度小于0.5 mg/L;在非正常工况下,1号、2号和3号污染源渗漏情景下污染物分别在第800,4015,1095 d扩散运移至输水隧洞所在位置,3种渗漏情景下污染物垂向扩散范围逐渐增大,但在平面上扩散范围存在较小差异。在1号和3号污染源情景下断层F4渗透性增强对污染物运移存在较大环境风险,在2号污染源情景下断层F3渗透性增强对输水隧洞区域未产生更大的环境风险。研究结果可为研究区地下水污染防治和风险评价提供科学支撑。
As an important component of geological structure,faults significantly affect the diffusion range and tansport rate of pollutants within the groundwater systems by changing the groundwater flow paths,permeability distribution and solute transport mechanism.However,few studies have simulated the effect of faults on groundwater pollution migration in landfill sites,either domestically or internationally.[Methods]A groundwater flow and solute transport model incorporating fault permeability was developed using GMS software.[Objective]The model simulated the impact of characteristic landfill pollutant seepage on the groundwater environment and a water delivery tunnel under various conditions,considering enhanced fault permeability.[Result]The simulation results show that:Under normal conditions,due to the anti-seepage measures at the bottom of the plant,the polluant diffusion range is largely confiend within the plant site,and the maximum pollutants concentration at the center iremains below 0.5 mg/L.Under abnormal conditions(leakage scenarios),pollutants from leakage source No.1,No.2 and No.3 reached the water delivery tunnel location on the 800th day,4015th day and 1095th day,respectively.The vertical diffusion range of pollutants progressively increased across the three leakage scenarios,whereas difference in the horizontal(area)diffusion range were minimal.Enhanced permeability of the F4 fault poses a greater environmental risk to pollutant migration in leakage source scenarios No.1 and No.3.In leakage source scenario No.2,however,the enhanced permeability of the F3 fault does not significantly increase environmental risk levels in the tunnel area.To safeguard the local soil and water environment,anti-seepage reinforcement of potentially affected tunnel areas is necessary.[Conclusion]The findings of this research provide scientific support for groundwater pollution prevention and risk assessment in the study area.
作者
裴洪军
谢浩
程天舜
汪丙国
PEI Hongjun;XIE Hao;CHENG Tianshun;WANG Bingguo(Shenzhen Water Planning and Design Institute Co.,Ltd.,Shenzhen Guangdong 518110,China;School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China)
出处
《地质科技通报》
北大核心
2025年第5期234-246,共13页
Bulletin of Geological Science and Technology
基金
国家自然科学基金项目(U1911205)。
关键词
地下水污染迁移
数值模拟
风险预测
断层
深圳
垃圾填埋场
groundwater pollution migration
numerical simulation
risk prediction
fault
Shenzhen City
landfill site
