地球物理学进展 ›› 2018, Vol. 33 ›› Issue (3): 1239-1246.doi: 10.6038/pg2018BB0544

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

不同赋存方式石油污染土实测探地雷达图像特征分析与评价

刘倩1,郭秀军1,2,3,*(),邵帅1,王莹莹1   

  1. 1. 中国海洋大学环境科学与工程学院,山东青岛 266100
    2. 山东省海洋环境地质工程重点实验室,山东青岛 266100
    3. 海洋环境与生态教育部重点实验室,山东青岛 266100
  • 收稿日期:2017-11-27 修回日期:2018-04-18 出版日期:2018-06-20 发布日期:2018-08-23
  • 通讯作者: 郭秀军 E-mail:guojunqd@163.com
  • 作者简介:第一作者简介 刘倩,女,1994年生,籍贯安徽,硕士研究生,主要从事环境岩土工程方面的研究.(E-mail: 499024027@qq.com)
  • 基金资助:
    国家自然科学基金(41772307)

Analysis and evaluation of the actual Ground Penetrating Radar images of oil contaminated areas that contain different existing forms of oil

LIU Qian1,GUO Xiu-jun1,2,3,*(),SHAO Shuai1,WANG Ying-ying1   

  1. 1. College of Environmental Science and Engineering, Ocean University of China, Shandong Qingdao 266100, China
    2. Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Shandong Qingdao 266100, China
    3. Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Shandong Qingdao 266100, China
  • Received:2017-11-27 Revised:2018-04-18 Online:2018-06-20 Published:2018-08-23
  • Contact: Xiu-jun GUO E-mail:guojunqd@163.com

摘要:

探地雷达(GPR)主要通过图像方式反映浅地表土壤污染状况,图像异常特征与地层条件、污染物赋存状态、探测参数及背景噪声综合相关.与数值和室内模拟研究时控制条件下所得“理想”剖面不同,实测剖面会受这些因素综合影响,异常特征变得复杂,识别难度增大.本文总结近20年来数十个石油污染土GPR探测实例,以石油污染物不同扩散阶段所呈现的赋存情形进行分类,分析总结相应的GPR探测图像异常,以期找到共性特征,建立污染区GPR异常识别标志.分析结果表明:短期形成的石油污染土常呈现低介电常数和低电导率特征,在包气带内存在时表现为厚度不一、形状不定的高幅异常;在毛细带内存在时表现为潜水面上下分布散落的、相连的斑点状或片状高幅异常;在含水层内存在时则表现为聚集在含水层顶部的反射信号增强的振幅异常区.经历长期生化降解过程的污染土通常呈现高电导率特征,在GPR图像上表现为信号衰减异常.虽然实测剖面异常特征复杂,但在解译时区分污染区扩散阶段和赋存方式将显著提高解译准确度.

关键词: 探地雷达, 石油污染, 异常特征, 异常分类

Abstract:

Ground Penetrating Radar (GPR) is a way to reflect soil pollution within a few tens of meters underground mainly by images. The abnormal characteristics of images are related to stratigraphic conditions, existing forms of pollutant and detection parameters. Different from the ‘ideal’ profiles under control conditions in numerical or indoor simulation, the measured profiles will be comprehensively affected by these factors and the anomalous features will become difficult to identify. This paper summarizes dozens of cases of the past 20 years and classifies according to the existing forms of petroleum pollutants during diffusion, in order to find common features and establish GPR abnormal identification marks. The results show that the oil-contaminated areas formed in the short term often perform the characteristics of low permittivity and low conductivity, which, in vadose zone are characterized by anomalously high amplitude with different shapes, in capillary zone are performed as contiguous speckled or blocky high-amplitude anomalies distribute around the water table, and show the enhanced reflection at the top of the aquifer when present in the aquifer. However, after long-term biodegradation, polluted areas generally show high conductivity characteristics and cause anomalously signal attenuation on GPR images. Although abnormal characteristics in the profiles of oil contaminated sites are complex, differentiating the stages of oil pollution and the existing forms of oil pollution when analyzing the images will significantly improve the accuracy of interpretation.

Key words: Ground Penetrating Radar(GPR), oil pollution, abnormal characteristic, abnormal classification

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