Geoelectrical investigations by means of resistivity methods in karst areas in Romania

Mitrofan, Horia; Povară, Ioan; Mafteiu, Mihai

doi:10.1007/s00254-007-0986-1

Cited by 20 publications

(9 citation statements)

References 10 publications

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“…It has been applied for investigating areas of complex geology, such as volcanic and geothermal areas (Di Maio et al, 1998), seismotectonic structures (Caputo et al, 2003;Nguyen et al, 2005), and areas affected by hydrogeologic phenomena and environmental problems (Ogilvy et al, 1999;Lapenna et al, 2005;Soupios et al, 2007;Georgaki et al, 2007;Naudet et al, 2008). It has been also used to locate cavities in the subsoil (El-Qady et al, 2005;Gibson et al, 2007;Crawford et al, 2007;Mitrofan et al, 2008;Soupios et al, 2008).…”

Section: Electrical Resistivity Tomography Techniquementioning

confidence: 99%

Near surface geophysics techniques and geomorphological approach to reconstruct the hazard cave map in historical and urban areas

Lazzari¹,

Loperte²,

Perrone³

2010

Adv. Geosci.

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Abstract. This work, carried out with an integrated methodological approach, focuses on the use of near surface geophysics techniques, such as ground penetrating radar and electrical resistivity tomography (ERT), and geomorphological analysis, in order to reconstruct the cave distribution and geometry in a urban context and, in particular, in historical centres. The interaction during recent centuries between human activity (caves excavation, birth and growth of an urban area) and the characters of the natural environment were the reasons of a progressive increase in hazard and vulnerability levels of several sites. The reconstruction of a detailed cave map distribution is the first step to define the anthropic and geomorphological hazard in urban areas, fundamental basis for planning and assessing the risk.

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Section: Electrical Resistivity Tomography Techniquementioning

confidence: 99%

Near surface geophysics techniques and geomorphological approach to reconstruct the hazard cave map in historical and urban areas

Lazzari¹,

Loperte²,

Perrone³

2010

Adv. Geosci.

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“…Consequently, the total drilling cost of an investigated area can be reduced. A number of successful applications have been reported on this topic (Andrews et al 1995;Barker and Moore 1998;Dahlin and Owen 1998;Owen and Dahlin 2005;Hamzah et al 2006;Göktürkler et al 2008;Mitrofan et al 2008). A shallow aquifer system composed of karst terrain was found in the study area where groundwater flow paths merged and reached the surface.…”

Section: Introductionmentioning

confidence: 95%

Mapping aquifer geometry using electrical resistivity tomography: a case study from Şanlıurfa, south‐eastern Turkey

Drahor

Berge

Göktürkler

et al. 2010

Near Surface Geophysics

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A shallow aquifer system was investigated with 2D electrical resistivity tomography (ERT) to determine the hydrogeological setting of the Balıklı Lake region, Şanlıurfa, Turkey. Many spring waters are found in the study area where groundwater flow paths merge and reach the surface. A recreation complex was planned near the Balıklı Lake by the Municipality of Şanlıurfa. Therefore, an ERT survey was carried out to reveal the subsurface characterization, particularly to investigate the possible shallow aquifer system beneath the recreation area. Consequently, 2D resistivity data along thirteen profiles were acquired in the study area and the data were inverted by a tomographic inversion technique. The conductive layers in the ERT results indicated a shallow aquifer zone probably related to a karstic environment. The high conductivity observed in this layer might be caused by pollution resulting from the industrial and domestic wastes of the residential areas. The high resistive bottom layer was considered to be the basement in the study area. The geometry of the shallow aquifer environment was confirmed by slicing maps obtained from the ERT data. To build the conceptual geological model, a 2D forward resistivity modelling study was also achieved after the inversion studies. The inversion parameters and borehole result underlie the background of the forward model. Field and synthetic data were compared to each other and tested in means of calculation of the misfits to determine the reliability of these models.

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“…Small catchments have developed high on the Cerna valley steep slopes, which rise several hundred meters above the river bed, with the resultant streamlets sinking when they reach a limestone substratum ( Figure 1). Tracer tests, as well as geoelectrical investigations (Mitrofan et al 2008;Povarȃ et al 2008) have shown that water discharging from Hercules spring partly originated from several such sinking streams.…”

Section: Geological and Hydrological Settingmentioning

confidence: 99%

Possible Conduit‐Matrix Water Exchange Signatures Outlined at a Karst Spring

Mitrofan

Marin²,

Povară

2014

Groundwater

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During a significant flood event, reversible water exchanges may occur between a karst conduit and its adjacent porous rock (frequently designated as "matrix"): while the flood pulse rises, some conduit-derived water is forced into the matrix; then, as the flood recedes, the same water flows back into the stream passage. The present note addresses such a karst setting in the Carpathian Mountains (Romania), where in addition, a usually stable flux of chloride originating in a natural saline inflow, was being mixed with a variable flow of karst freshwater. For that particular case, with the above-mentioned process of matrix storage/release from storage assumedly taking place downstream of the mixing site, two distinct chemical signatures could be noticed during a flood event: an initial depletion in the spring flow chloride flux, subsequently followed by a comparable chloride flux enrichment (the depletion and the enrichment being outlined with respect to the essentially stable chloride flux value that had been noticed to persist at the spring over a long period of flow rate recession). Concomitantly with such flood-induced fluctuations in the spring chloride flux, the spring discharge displayed, for long periods, abnormally slow variations: the latter likely indicated that the spring supply rate actual oscillations were buffered by the reversible water exchanges which took place between the karst conduit and its adjacent matrix. On the whole, these results show that conduit-matrix water exchanges could be interpreted by simple mass balance calculations that involved fluxes of a conservative tracer (the chloride ion in that particular case).

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Geoelectrical investigations by means of resistivity methods in karst areas in Romania

Cited by 20 publications

References 10 publications

Near surface geophysics techniques and geomorphological approach to reconstruct the hazard cave map in historical and urban areas

Near surface geophysics techniques and geomorphological approach to reconstruct the hazard cave map in historical and urban areas

Mapping aquifer geometry using electrical resistivity tomography: a case study from Şanlıurfa, south‐eastern Turkey

Possible Conduit‐Matrix Water Exchange Signatures Outlined at a Karst Spring

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