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1. 深圳市水务规划设计院股份有限公司
2. 中国地质大学(武汉)环境学院
Online First:31 December 2024,
Published:2025
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裴洪军, 谢浩, 程天舜, et al. 断层对垃圾填埋场地下水CODMn分布影响的模拟:以深圳市龙华能源生态园为例[J]. Bulletin of Geological Science and Technology, 2025, 44(5): 234-246. DOI: 10.19509/j.cnki.dzkq.tb20240731.
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
4 015
1 095 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. MethodsA groundwater flow and solute transport model incorporating fault permeability was developed using GMS software. ObjectiveThe 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. ResultThe 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. ConclusionThe findings of this research provide scientific support for groundwater pollution prevention and risk assessment in the study area.
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