Crossline resistivity tomography for the delineation of anomalous seepage pathways in an embankment dam

Cho, In‐Ky; Yeom, Ji-Yeon

doi:10.1190/1.2435200

Cited by 84 publications

(48 citation statements)

References 25 publications

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“…porous or fractured zones). This technique is widely used to detect voids [37][38][39][40][41], underground water [42][43][44], fractural zone recognition [45][46][47][48][49][50][51][52][53][54][55][56][57], and mineral exploration [58,59]. The difference in resistivity between the target and its surrounding materials is a key factor to ensure this technique is viable.…”

Section: Electric Resistivitymentioning

confidence: 99%

Auscultation of a Dam for Mining Restoration in Quebec, Canada

Yaya¹,

Cheng²

2016

J Civil Environ Eng

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The tailing management is a long term concern for environment and social security. Following the discovery of a new gold mineralization, a mining company aims at reusing one of tailings storage facility at the mining site. However, there is a small treated water reservoir (polishing pond) downstream of the Northwest dam. It is therefore important to know the present state of the Northwest dam's internal structure. Geophysical methods of electrical resistivity and georadar were used for the auscultation of the Northwest dam. Numerical models were subsequently used to assess the geotechnical behavior of the dam in different deposition situations by simulating the restoration.The image processing results of georadar data show a layered structure near the surface. Changes in electrical resistivity offer deeper information than georadar. The lateral variability of the electrical resistivity corresponds to heterogeneity within each layer. As we cannot collect samples for the characterization of materials, the geophysical interpretation results help to estimate the compositional structure of the dam; ultimately it helps in numerical modeling on the safety factor estimation.

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Section: Electric Resistivitymentioning

confidence: 99%

Auscultation of a Dam for Mining Restoration in Quebec, Canada

Yaya¹,

Cheng²

2016

J Civil Environ Eng

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“…Images of subsurface bulk electrical resistivity can therefore be used to help assess geologic units that may be more likely to conduct seepage through foundation or embankment materials, or to map regions of increased saturation. Numerous resistivity studies have focused on both internal erosion detection (Cho and Yeom, 2007;Kim et al, 2007;Sjö dahl et al, 2005Sjö dahl et al, , 2008 as well as identification of seepage pathways associated with dam foundation materials (Abu-Zeid, 1994;Di and Wang, 2010;Panthulu et al, 2001).…”

Section: Self-potentialmentioning

confidence: 99%

Hydrogeophysical Investigations at Hidden Dam, Raymond, California

Minsley

Burton

Ikard

et al. 2011

JEEG

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Self-potential and direct current resistivity surveys are carried out at the Hidden Dam site in Raymond, California to assess present-day seepage patterns and better understand the hydrogeologic mechanisms that likely influence seepage. Numerical modeling is utilized in conjunction with the geophysical measurements to predict variably-saturated flow through typical two-dimensional dam cross-sections as a function of reservoir elevation. Several different flow scenarios are investigated based on the known hydrogeology, as well as information about typical subsurface structures gained from the resistivity survey. The flow models are also used to simulate the bulk electrical resistivity in the subsurface under varying saturation conditions, as well as the self-potential response using petrophysical relationships and electrokinetic coupling equations.The self-potential survey consists of 512 measurements on the downstream area of the dam, and corroborates known seepage areas on the northwest side of the dam. Two directcurrent resistivity profiles, each approximately 2,500 ft (762 m) long, indicate a broad sediment channel under the northwest side of the dam, which may be a significant seepage pathway through the foundation. A focusing of seepage in low-topography areas downstream of the dam is confirmed from the numerical flow simulations, which is also consistent with past observations. Little evidence of seepage is identified from the self-potential data on the southeast side of the dam, also consistent with historical records, though one possible area of focused seepage is identified near the outlet works. Integration of the geophysical surveys, numerical modeling, and observation well data provides a framework for better understanding seepage at the site through a combined hydrogeophysical approach.

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“…Previous geophysical studies have demonstrated the utility of using electrical resistivity methods to detect and characterize the seepage conditions occurring at dams [7]. Dahlin and Johansson [8], Johansson and Dahlin, [5], Aal et al [6] and Cho and Yeom [9], had earlier applied this method to study the embankment of dams. Benson et al [10] had also applied it successfully to the detection of buried wastes and wastes migrations.…”

Section: Introductionmentioning

confidence: 99%

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

Chinedu¹,

Ogah²

2013

OJAppS

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To determine and map the subsurface conditions of a dam, a 2D electrical resistivity tomography study was carried out within the two flanks of Zaria dam at Shika. This was done to ascertain if the variations in the volume of water content in the dam is due to an anomalous seepage beneath the subsurface or seasonal effects. On the basis of the interpretation of the acquired data, various zones of relatively uniform resistivity values were mapped and identified. The first zone is characterized by moderate resistivity values of 150 -600 ohm-m. It represents unsaturated topsoil with thicknesses varying from 1 -4.5 m. The second (intermediate depth) resistivity zone, with values ranging from 5 -100 ohm-m and thickness varying from 3.5 -10 m, represents a silt clay layer with high moisture content. The third resistivity zone represents fairly weathered granite and is characterized by relatively high resistivity values ranging from 700 -6000 ohm-m. The available borehole log data correlated well with the pseudo-sections in relation to the obtained resistivity values and depth. Zones of relatively low resistivity within the bedrock are interpreted to represent potential seepage pathways. Hence, this geophysical method can be successfully used to delineate and map these seepage pathways within the subsurface of the earth dam.

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Crossline resistivity tomography for the delineation of anomalous seepage pathways in an embankment dam

Cited by 84 publications

References 25 publications

Auscultation of a Dam for Mining Restoration in Quebec, Canada

Auscultation of a Dam for Mining Restoration in Quebec, Canada

Hydrogeophysical Investigations at Hidden Dam, Raymond, California

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

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