Application of Electrical Resistivity Tomography for Sand Underwater Extraction

Grigorova, Maya; Rilski”, Bulgaria Geology “St. Ivan; Koprev, Ivaylo

doi:10.18509/gbp.2018.02

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The reported results illustrate the potential of electrical resistivity methods to separate different layers and monitor the subsurface based on electrical resistivity [2], [3], [4].…”

Section: Introductionmentioning

confidence: 75%

GEOPHYSICAL INVESTIGATIONS IN Â€œSTARITE KOLIBIâ€ MARBLE DEPOSIT IN CENTRAL SOUTHERN BULGARIA

Grigorova¹,

Rilskiâ€²,

Koprev³

2019

Proceedings 2019

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The scope of the research is to collect information about presence and locations of marbles in the area of "Starite kolibi" deposit. Around the area of the study, there is information from several boreholes, according to which the following rocks are observed: sandstones, clays, marble. Marbles in the area are transformed limestone and dolomite limestone under the conditions of regional metamorphism. In this research is used Electrical Resistivity Tomography (ERT) as a technique that can detect and characterize layers by exploiting resistivity contrasts between different layers using electrical current. The specific electrical resistance of sandstones, conglomerates and clays is lower because they are strongly saturated with pore water. The marbles on the other hand are among the highest electrical resistance rocks. Thus, the specific electrical resistance of the marble is distinctly higher than that of the clays which allows for their differentiation. In the whole investigated area, the top layer is made of clay and sand mix with small marble pieces and soil. The top layer's average thickness is about 0,4m. The electrical resistivity measurements are used to "separate" a hard rock (marble) from clay and sandstone into the horizons.

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“…The reported results illustrate the potential of electrical resistivity methods to separate different layers and monitor the subsurface based on electrical resistivity [2], [3], [4].…”

Section: Introductionmentioning

confidence: 75%

GEOPHYSICAL INVESTIGATIONS IN Â€œSTARITE KOLIBIâ€ MARBLE DEPOSIT IN CENTRAL SOUTHERN BULGARIA

Grigorova¹,

Rilskiâ€²,

Koprev³

2019

Proceedings 2019

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“…To characterise the lithology and thickness of near water-bed materials is possible to be used electrical resistivity tomography (ERT). This method has potential to detect the near-bed layer with significantly good resolution [3].…”

Section: Qualitative Characteristic Of Deposit and Classification Of mentioning

confidence: 99%

Characteristic of the Kriva Bara Deposit and Extraction Techniqes

Grigorova¹,

Rilski”²,

Koprev³

2018

Proceedings 2018

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The "Kriva bara" deposit is located on the left terrace of the Iskar River in Sofia valley. The area of Sofia valley is built of Neogene ponds and Quaternary sediments. Fieldsurrounding mountains are made of Paleozoic, Triassic and Jurassic sediments formed in a different facial environment and which have a specific layers arrangement and substantial composition. The "Kriva Bara" field is made up of the alluvial deposits of the Iskar River, represented by sands, gravel and clay, including thick layer of ballast, small lenses and thin layers of sandy clays. Alluvial deposits lie horizontally. The application of extraction techniques aims to achieve the complex and safe carrying out the extraction works, observing the environment protection and achieving healthy and safe working conditions.

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“…In recent years, the ERT method has established itself as a very useful tool in mapping the near-surface geological section [1], [2], [3]. Our previous research efforts and experience show that its combined application with various other techniques enables a much more precise delineation of the spatial boundaries of geological and hydrogeological units, tectonic faults, fissured and karst zones, water saturated and unsaturated zones, zones characterized by a different degree of water permeability, contaminated areas, landslides, etc.…”

Section: Introductionmentioning

confidence: 99%

Geoelectrical Approach for Differentiating the Hydrogeological Section in the Study of a Tailings Pond Site

Stoyanov¹,

Dimovski²

2020

Proceedings

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An important issue in the construction of tailings ponds is the detailed knowledge of the hydrogeological section beneath the bottom of the facility. The answer to this question can hardly be achieved only by a standard drilling survey, especially in regions with complex geological structure where the identification of small in size, highly permeable areas requires a high density of the borehole network. The proposed geoelectrical approach for mapping the low-rank hydrogeological units forming the tailings dam basement involves the application of the electrical resistivity tomography method. The subsurface geoelectrical model obtained by this method is transformed into a hydrogeological model on the base of data from the performed standard core drilling survey and slug tests. The applicability and high efficiency of the proposed integrated approach is demonstrated by the results from the study of a site for construction of a tailings pond near Breznik, Bulgaria.

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Application of Electrical Resistivity Tomography for Sand Underwater Extraction

Cited by 4 publications

References 3 publications

GEOPHYSICAL INVESTIGATIONS IN Â€œSTARITE KOLIBIâ€ MARBLE DEPOSIT IN CENTRAL SOUTHERN BULGARIA

GEOPHYSICAL INVESTIGATIONS IN Â€œSTARITE KOLIBIâ€ MARBLE DEPOSIT IN CENTRAL SOUTHERN BULGARIA

Characteristic of the Kriva Bara Deposit and Extraction Techniqes

Geoelectrical Approach for Differentiating the Hydrogeological Section in the Study of a Tailings Pond Site

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