Electrical Resistivity Imaging of Suspected Seepage Channels in an Earthen Dam in Zaria, North-Western Nigeria

Chinedu, Ani D.; Ogah, A. J.

doi:10.4236/ojapps.2013.31020

Cited by 17 publications

(8 citation statements)

References 11 publications

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“…Zones of relatively low resistivity within the bedrock were interpreted to represent potential seepage pathways. Hence, this geophysical method was successfully used to delineate and map these seepage pathways within the subsurface of this earth dam [67]. A similar case of seepage anomaly detection was discovered in Ogobomboso earthfill dam, also in Nigeria, where Self-Potential (SP) and ERT were conducted and two possible seepage zones were identified within the dam embankment.…”

Section: Summary Points Discussion and Concluding Remarksmentioning

confidence: 67%

Geophysical Methods and their Applications in Dam Safety Monitoring

Adamo¹,

Al‐Ansari²,

Sissakian³

et al. 2020

Journal of Earth Sciences and Geotechnical Engineering

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The use of geophysical methods in dam sites investigations and safety monitory has proved their good value and versatility in many earthfill dam sites as early as the 1920s. In the following years great development has occurred in the methods, application procedures and tools used. They may be considered today as good ways for carrying out observation tasks on existing dams in non-intrusive and much faster and cheaper ways than the traditional geotechnical methods. It is possible using them to discover anomalies in the dam body or its foundation at an early stage and allowing quick intervention repair works. These methods seek to register and present variations in the basic geotechnical material properties in dams such as; bulk density, moisture content, elasticity, mechanical properties of rocks, electrical resistivity and mineralogy and magnetic properties and so forth. Such variations can indicate increasing seepage flow, progression in cracks’ sizes, formation of voids, caverns and other instability manifestations. Depending on how any investigation is carried out and the targeted anomaly, there is now selection of these methods such as: Electromagnetic Profiling (EM), Electrical Resistivity Tomography (ERT), SelfPotential (SP), Ground Penetration Radar (GPR), variety of Seismic Methods (SM) which can be applied using such equipment as in Seismic refraction, Seismic Reflection, Multi Analysis of Rayleigh surface waves (MASW) instruments, or using Refraction Micrometer (ReMi), macro-gravity method, and Cross-Hole Seismic Tomography. In addition, Temperature Measurements and other less used methods can be used like Microgravity measurement, Magnetic Profiling and Radio Magnetotelluric methods. An attempt is made here to cover the details of these methods, their advantages and limitations and to prove their usefulness in many dam sites all over the world. One observed issue is their adaptability to embankment dams more than to concrete dams and their popularity for checking seepage related problems and material changes within dam bodies and their foundations such as formation of voids and sinkholes.

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Section: Summary Points Discussion and Concluding Remarksmentioning

confidence: 67%

Geophysical Methods and their Applications in Dam Safety Monitoring

Adamo¹,

Al‐Ansari²,

Sissakian³

et al. 2020

Journal of Earth Sciences and Geotechnical Engineering

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show abstract

“…ERT is a preferred method for levee investigation and many studies refer to it [Burns et al, 2006;Chinedu and Ogah, 2013;Fargier et al, 2014;Johansson and Dahlin, 1996;Jones et al, 2014;Lin et al, 2013;Lopes et al, 2012;Royet et al, 2013;Sjödahl et al, 2005].…”

Section: Dc-electrical Resistivity Methodsmentioning

confidence: 99%

Geophysical and geotechnical methods for fluvial levee investigation: A review

Dezert

Fargier

Lopes³

et al. 2019

Engineering Geology

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…The respectability of a dam bank can be sabotaged by the presence of land highlights, like deficiencies, breaks, gaps, jointed or shear zones under the dam pivot or discontinuities in the structure itself (Chinedu, 2013). All dams have some drainage as the seized water looks for easiest courses of action through the dam and its establishment.…”

Section: Introductionmentioning

confidence: 99%

Correlation of 2D Electrical Resistivity and Self-Potential Methods for the Assessment of the Integrity of Goronyo Dam NW Nigeria

Augie¹,

Saleh²,

Ologe³

et al. 2022

CMUJNS

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In this research, combined 2D electrical resistivity and self-potential (SP) methods were employed to locate anomalous electrical conductivity around the Goronyo dam in order to determine the condition of the embankment of the earth dam. The data were taken with the reference to resistivity and SP values using Wenner configuration. The results obtained from these techniques shows that the area was underlain by four stratigraphic layers, namely; clayey sand, wet sandy clay, laterite and partially weathered basement complex rock as compared with the resistivities of common rocks and borehole lithology of the area. The low SP (< 200 mV)/high resistivity zones in the overburden of profiles P1, P2 and P3 shows the presence of partially weathered basement complex rocks which was probably due to compactness and dryness around the dam. However, the zones of high SP (≥ 200 mV)/low apparent resistivity regions (z1 and z2) of profiles P1 (2 Ωm to 27 Ωm), P2 (3 Ωm to 25 Ωm) and P3 (3 Ωm to 14 Ωm) have revealed the weak zones associated with wet sandy soil. Results obtained from 2D electrical resistivity (z1) technique have correlated well with the results of SP sections (z2). These regions of weak zones occupied the x-distance along the profiles; P1/or S2 (120 m to 200 m and 250 m to 400 m), P2/or S2 (1 m to 156 m and 192 m to 400 m) and P3/or S3 (48 m to 400 m) with their corresponding depth y, ranging from 23 m to 30 m, 26 m to 30 m and 23 m to 30 m. Keywords: 2D Electrical Resistivity Tomography (ERT), Self-Potential (SP), Dam, Subsurface, Seepage, Condition

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Electrical Resistivity Imaging of Suspected Seepage Channels in an Earthen Dam in Zaria, North-Western Nigeria

Cited by 17 publications

References 11 publications

Geophysical Methods and their Applications in Dam Safety Monitoring

Geophysical Methods and their Applications in Dam Safety Monitoring

Geophysical and geotechnical methods for fluvial levee investigation: A review

Correlation of 2D Electrical Resistivity and Self-Potential Methods for the Assessment of the Integrity of Goronyo Dam NW Nigeria

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