探地雷达在LNAPL污染土壤探测中的应用进展研究

轻非水相液体(LNAPL)的不当使用、渗漏及不当处置等会造成严重的土壤和地下水污染,威胁环境和公共卫生安全.探地雷达(GPR)作为一项重要的浅表地球物理观测技术已在LNAPL污染土壤探测中发挥重要作用.本文对近年来国内外学者利用GPR探测LNAPL污染土壤方面的理论和应用研究进行梳理,结合实例主要从以下几个方面开展评述.这些方面包括LNAPL污染土壤电性特征、基于GPR探测的LNAPL污染土壤建模、GPR信号响应、GPR的测量方式等.这些理论与应用研究为如何从场地的地质和水文背景中提取与污染有关的GPR信号做出了指导与成功的示范.现场和实验室的大量的研究工作表明,所有成功的案例都不可能倚赖单一的手段或方法.直接(例如,钻孔)和间接(例如,GPR)调查结合,多手段、多方法的有效配合,才有可能最大程度的减小探测结果的非唯一性,达到全面准确了解污染场地的目的.

Progress in application of ground penetrating radar in LNAPL contaminated soil detection of LNAPL

The misuse,leakage and uncontrolled disposal of Light Non-Aqueous Phase Liquid(LNAPL)contaminates soil and groundwater and threaten the environment and public health.As one of the most important techniques in near-surface geophysics,Ground Penetrating Radar(GPR)has played an important role in LNAPL contaminated soil detection.In this paper,the work on GPR detection of LNAPL contaminated soil by domestic and foreign scholars in recent years were reviewed.Combined with the examples,this paper mainly reviews in the following aspects.These aspects include the electrical characteristics of LNAPL contaminated soil,the modeling of LNAPL contaminated soil based on GPR detection,GPR signal response,and GPR measurement methods.These studies in theory and practice provide guidance and successful demonstration for how to extract significant GPR signals linked to contamination from the mix of the geological and hydrological signals present at the site.A lot of research work in the field and laboratory shows that all successful cases can not rely on a single means or method.The combination of direct(e.g.,drilling)and indirect(e.g.,GPR)investigations,and the effective cooperation of multiple observation techniques can eliminate the non-uniqueness of detection results as much as possible,and lead to a comprehensive and accurate understanding of contaminated sites.