Journal ArticleDOI
Crossline resistivity tomography for the delineation of anomalous seepage pathways in an embankment dam
In-Ky Cho,Ji-Yeon Yeom +1 more
TLDR
Crossline resistivity tomography was developed to find out anomalous seepage pathways in an embankment dam as mentioned in this paper, which yields relatively accurate geoelectric structure of the dam when applied to synthetic data.Abstract:
Crossline resistivity tomography was developed to find out anomalous seepage pathways in an embankment dam. By applying crossline tomography to the investigation of embankment dams, leakage pathways can be effectively located because the crossline tomogram presents resistivity distribution in the horizontal plane of an embankment dam. To test the effectiveness of crossline tomography, we applied it to data from an experiment designed to delineate anomalous seepage pathways in the embankment dam. The method yields relatively accurate geoelectric structure of the dam when applied to synthetic data. In the crossline resistivity tomogram, abrupt discontinuities of a low resistivity band corresponding to the core of the dam can be interpreted as leakage pathways. Application to real data obtained from an embankment dam in Korea yields the result which accurately depicts two anomalous seepage pathways. The identified pathways were consistent with low resistivity zones in the dipole-dipole resistivity section obtained on the crest of the dam. One pathway was confirmed by visual inspection of the dam, and afterward, by trenching.read more
Citations
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Journal ArticleDOI
Resistivity monitoring for leakage and internal erosion detection at Hallby embankment dam
TL;DR: In this article, the authors used time-lapse inversion to focus the variation over time and suppress artefacts due to the resistivity structure of Hallby dam, and found that increasing long term resistivity has been noticed in a particular zone in the left embankment.
Journal ArticleDOI
4D electrical resistivity tomography monitoring of soil moisture dynamics in an operational railway embankment
Jonathan Chambers,David Gunn,Paul Wilkinson,Philip Meldrum,Edward Haslam,S. Holyoake,M. Kirkham,Oliver Kuras,A. Merritt,Joanna Wragg +9 more
TL;DR: In this article, the internal moisture dynamics of an aged railway earthwork embankment, which is still in use, were investigated using 2D and 3D resistivity monitoring, and a methodology was employed that included automated 3D ERT data capture and telemetric transfer with onsite power generation, the correction of resistivity models for seasonal temperature changes and the translation of subsurface resistivity distributions into moisture content based on petrophysical relationships developed for the embankments material.
Journal ArticleDOI
Preferential fluid flow pathways in embankment dams imaged by self-potential tomography
TL;DR: In this paper, the authors invert self-potential data in order to locate anomalous water flow pathways in dams and embankments and to estimate the seepage velocity.
Journal ArticleDOI
Combined geophysical surveys for the characterization of a reconstructed river embankment
Laura Busato,Jacopo Boaga,Luca Peruzzo,Luca Peruzzo,Mahjoub Himi,Mahjoub Himi,Simonetta Cola,Silvia Bersan,Giorgio Cassiani +8 more
TL;DR: In this paper, the authors presented the joint use of multichannel analysis of surface waves (MASW), electrical resistivity tomography (ERT), and ground penetrating radar (GPR) to characterize a reconstructed river embankment (made of concrete and tout-venant) prone to serious leakages.
Journal ArticleDOI
Contribution of the geophysical methods in characterizing the water leakage in Afamia B dam, Syria
TL;DR: In this article, the authors investigated the origin of the water losses problem in the Afamia B dam located at Al-Ghab basin in Syria using various geophysical methods including a superficial electromagnetic (EM), an electrical sounding (ES) and electrical resistivity tomography (ERT).
References
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Practical techniques for 3D resistivity surveys and data inversion1
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Journal ArticleDOI
Least-squares deconvolution of apparent resistivity pseudosections
M. H. Loke,R. D. Barker +1 more
TL;DR: In this article, a smoothness-constrained least square method is used to produce a 2D subsurface model free of distortions in the apparent resistivity pseudosection caused by the electrode array geometry used.