利用综合自电势、电阻率和感应极化信号确定地下水流路径

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
A Revil, A Ghorbani, X Zhao, A Mouyeaux, L Barrère, J Richard, L Peyras, P Vaudelet
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引用次数: 0

摘要

摘要 兰皮大坝(法国奥德省黑山)被认为是法国最古老的大坝之一。为了更好地了解大坝下游花岗岩底层的地下水流模式,我们进行了一次地球物理勘测。首先使用诱导极化对导电率和归一化电荷率进行成像。在实验室中测量和分析了来自该地点的八个花岗岩岩芯样本。它们的导电率和归一化电荷率是孔隙度和阳离子交换容量(CEC)的函数。野外数据和岩石物理结果被用来对底层的含水量、阳离子交换容量和渗透率分布进行成像。然后,自电位被用作一种补充性的被动地球物理技术,在没有金属体的情况下,通过所谓的流电位效应对地下水流直接敏感。事实上,在所谓的双电层中,固体颗粒附近的过量电荷会被地下水流拖动,进而产生电流(流势),进而产生电场。在诱导极化剖面覆盖的区域内绘制了所产生的自电势信号图。该图显示了振幅为 80 mV 的巨大正异常,可能与土壤饱和地区的地下水上涌有关。为模拟这一异常现象,进行了地下水流模拟。模拟分两步进行。利用从感应极化数据中获得的渗透率和含水量分布,建立初步的地下水流模型。然后,利用自电位数据中包含的信息(包括通过电阻率断层扫描获得的电导率分布)更新该地下水流模型。自电位数据反演算法通过二维数值测试进行了验证。该分析得出了一个地下水流模型,水流集中流经一个高渗透率区域。这项研究展示了如何将三种地质电学方法(自电位、诱导极化和电阻率)有效地结合起来,对大坝附近的地下水流进行成像。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Groundwater flow paths using combined self-potential, electrical resistivity, and induced polarization signals
SUMMARY The dam of Lampy (Black Mountain, Aude, France) is considered as one of the oldest dams in France. A geophysical survey is performed to better understand the pattern of groundwater flow downstream of this dam in the granitic substratum. Induced polarization is first used to image both electrical conductivity and normalized chargeability. Eight core samples of granite from this site are measured and analysed in the laboratory. Their electrical conductivity and normalized chargeability are expressed as a function of the porosity and cation exchange capacity (CEC). The field data and the petrophysical results are used to image the water content, the CEC and the permeability distribution of the substratum. Then, self-potential is used as a complementary passive geophysical technique, which, in absence of metallic bodies, is directly sensitive to groundwater flow through the so-called streaming potential effect. Indeed, the excess of electrical charges in the vicinity of the solid grains, in the so-called double layer, is dragged by the ground water flow generating in turn an electrical (streaming) current and therefore an electrical field. A map of the resulting self-potential signals is done over the area covered by the induced polarization profiles. This map shows a large positive anomaly with an amplitude of ∼80 mV possibly associated with upwelling groundwater in an area where the soil is water-saturated. A groundwater flow simulation is performed to model this anomaly. This is done in two steps. A preliminary groundwater flow model is built using the permeability and water content distributions obtained from the induced polarization data. Then, this groundwater flow model is updated using the information contained in the self-potential data including the electrical conductivity distribution obtained through resistivity tomography. The algorithm for the inversion of the self-potential data is validated through a 2-D numerical test. This analysis yields a groundwater flow model with the flow being focused through a high permeability zone. This study shows how three geoelectrical methods (self-potential, induced polarization and electrical resistivity) can be efficiently combined to image groundwater flow in the vicinity of a dam.
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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