联合使用直流电阻率和感应极化的优化勘测设计:监测虚拟现场的 DNAPL 源区演变。

IF 3.5 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Siyuan Qiang , Xiaoqing Shi , André Revil , Xueyuan Kang , Christopher Power
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引用次数: 0

摘要

直流(DC)电阻率和诱导极化(IP)方法的联合应用(称为联合 DCIP 法)在描述临界区动态过程(如污染场地的高密度非水相液体(DNAPLs)扩散)方面越来越受欢迎。大规模 DCIP 勘测通常需要相当长的时间,因此需要优化勘测设计,以提高勘测分辨率,同时控制时间和人力成本。然而,迄今为止,优化地质电气勘测设计的方法仅集中在直流应用上,而针对组合式 DCIP 的优化勘测设计的效率还有待研究。此外,由于地下异质性会影响地球物理观测,大多数野外规模的数值 DCIP 研究仍在缺乏真实含水层异质性的人工场地进行,这可能会影响 DCIP 勘测评估的有效性。在这项工作中,基于高分辨率真实含水层模拟创建了一个虚拟地质环境现场,以模拟 DNAPL 演化情景,并同时采用 DCIP 勘测进行监测,同时采用了优化勘测设计和常用的非优化勘测设计(温纳、温纳-施伦贝谢、偶极-偶极阵列)。结果表明,根据不同的 DCIP 特性(电导率、电荷率、归一化电荷率和弛豫时间),先验信息优化勘测可将 DNAPL 源区(SZ)的监测精度提高 8% 至 19%。另一项理想的数值测试表明,与传统勘测相比,优化勘测最多可缩短 83% 的测量时间,同时保持相同的地下图像分辨率。此外,在没有先验信息或先验信息有限的情况下设计的优化勘测,在整个地下空间成像方面也比传统勘测更有效率。这项研究的结果凸显了优化勘测设计方法在提高 DCIP 勘测地下污染物和水文过程的效率方面的巨大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimized survey design for the joint use of direct current resistivity and induced polarization: Monitoring of DNAPL source zone evolution at a virtual field site
The combined application of direct current (DC) resistivity and induced polarization (IP) methods, referred to as combined DCIP method, has gained popularity for characterizing the critical zone dynamic processes such as dense non-aqueous phase liquids (DNAPLs) spreading at contaminated sites. Large-scale DCIP surveys typically require considerable durations, necessitating optimized survey designs to enhance survey resolution while controlling time and labor costs. However, to date, approaches to optimize geoelectrical survey design have focused solely on DC applications, and the efficiency of optimized survey designs for combined DCIP is yet to be investigated. Moreover, as subsurface heterogeneity would impact the geophysical observations, most field-scale numerical DCIP studies have still been conducted at artificial sites that lacked realistic aquifer heterogeneity, which could affect the validity of the DCIP survey evaluations. In this work, a virtual geoenvironmental field site based on high-resolution real aquifer analog was created to simulate a DNAPL evolution scenario with simultaneous monitoring by DCIP survey, employing both the optimized survey design and popular non-optimized survey designs (Wenner, Wenner-Schlumberger, Dipole-Dipole arrays). Results show that the optimized survey with prior information improves the monitoring accuracy of DNAPL source zone (SZ) by 8 to 19 % with respect to different DCIP characteristics (conductivity, chargeability, normalized chargeability, and relaxation time). Another ideal numerical test indicates that the optimized survey shows up to an 83 % reduction in measurement time compared to the conventional survey, while maintaining the same subsurface image resolution. Additionally, the optimized surveys designed without or with limited prior information were also shown to be more efficient than conventional survey for imaging the entire subsurface space. The findings in this study highlight the immense potential of optimized survey design methods for enhancing the efficiency of DCIP surveys on subsurface contaminants and hydrological processes.
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来源期刊
Journal of contaminant hydrology
Journal of contaminant hydrology 环境科学-地球科学综合
CiteScore
6.80
自引率
2.80%
发文量
129
审稿时长
68 days
期刊介绍: The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.
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