Electrical survey for detailed characterizing of underground karst: Example from Iskar River (Western Bulgaria)

Shanov, Stefan; Mitev, A.; Benderev, Aleksey; Kostov, Konstantin; Mihailova, B.

doi:10.3997/2214-4609-pdb.126.6293

Cited by 5 publications

(4 citation statements)

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“…Целта на това проучване е да се изяснят хидрогеоложките условия в района на извора и особеностите на разкриването на водите му на повърхността. Основният метод за постигане на поставената цел е използването на геофизични средства за проучване, които са доказали добрата си ефективност при изследване на карстова среда (Shanov, Benderev, 1993;Shanov et al, 2009;Ivanov et al, 2021).…”

Section: въведениеunclassified

Hydrogeological conditions in the recharge area of the Glava Panega spring

Gerginov,

Benderev

2023

Rev. Bulg. Geol. Soc.

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Hydrogeological conditions in karst areas reflect the high velocities of groundwater movement in open or material-filled channels. Usually they remain hidden under the ground, and only high flow rates of the flowing underground water reveal them. An example is one of the largest karst springs in Bulgaria – Glava Panega in the village of Zlatna Panega. There are two hydraulically connected lakes close to the spring head. The purpose of the present study is to establish this relationship, as well as to provide a more accurate information of groundwater discharge zones in the lake near the source of groundwater. The methods used include analyzing specific information from speleological studies, combined with conducted on field geophysical studies. Profiling was carried out using the method of the self potential, as well as research with the determination of the values of the natural electromagnetic field. The obtained results support the understanding of the behavior of the karst system in the area of the Glava Panega spring.

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Section: въведениеunclassified

Hydrogeological conditions in the recharge area of the Glava Panega spring

Gerginov,

Benderev

2023

Rev. Bulg. Geol. Soc.

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“…Electrical Resistivity Tomography (ERT) is easy to use and very productive geophysical method used to determine the subsurface resistivity distribution by making measurements generally on the ground surface [4], [5], [6], [7], [8], [9]. The ERT method is an electrical method where electrical current is induced in the ground using two current electrodes.…”

Section: Description Of the Technologymentioning

confidence: 99%

Geophysical Investigations in Open Pit “Ada Tepe” Gold Mine in Southeastern Bulgaria

Grigorova¹,

Rilski”²

2020

Proceedings

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The aim of the research is to provide information about geological features in the area of open pit "Ada Tepe" gold mine part of the "Khan Krum" gold deposit. The mine site is located at Ada Tepe hill, approximately three kilometers south of the town of Krumovgrad in southeastern Bulgaria. The "Ada Tepe" deposit is classified as a low sulphidation type epithermal gold-silver deposit formed in the Early Oligocene. Around the area of the study, there is information from several drillings, according to which the following rocks are observed: clays, breccia conglomerate, breccia conglomerate with quartz inclusions and metamorphic clasts. In this research Electrical Resistivity Tomography (ERT) is used to detect and characterize layers by exploiting resistivity contrasts between different geological features using electrical current. The specific electrical resistance of conglomerates and clays is lower because they are strongly saturated with pore water. The silicified sedimentary rocks on the other hand are among the highest electrical resistance rocks. Thus, the specific electrical resistance of the breccia conglomerate with quartz inclusions is distinctly higher than that of the metamorphic clasts and clays which allows for their differentiation. This information is highly important for drilling blasting works because of the blasting energy distribution.

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“…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. [4], [5], [6], [7], [8], [9], [10], [11], [12]. This approach has been successfully tested during a complex survey performed by our team.…”

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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Electrical survey for detailed characterizing of underground karst: Example from Iskar River (Western Bulgaria)

Cited by 5 publications

References 0 publications

Hydrogeological conditions in the recharge area of the Glava Panega spring

Hydrogeological conditions in the recharge area of the Glava Panega spring

Geophysical Investigations in Open Pit “Ada Tepe” Gold Mine in Southeastern Bulgaria

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

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