1D joint inversion of radiomagnetotellluric (RMT) and transient-electromagnetic (TEM) data: an application for groundwater prospection in Grundfør, Denmark

Schwinn, W.; Tezkan, B.

doi:10.3997/2214-4609.201407318

Cited by 8 publications

(9 citation statements)

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“…1996; Tezkan 1999) and groundwater (Turberg et al . 1994; Schwinn and Tezkan 1997), for engineering problems (Dupis and Choquier 1996), for archaeological research (Baum 1998), and for the detection of caves (Schiffbauer 2001). The radiomagnetotelluric method uses carrier waves from high‐power civilian and military transmitters operating in a frequency range between 10 kHz and 300 kHz.…”

Section: Basic Principles Of the Radiomagnetotelluric Methodsmentioning

confidence: 99%

“…The aim of the radiomagnetotelluric measurements near the Brazi Refinery in Romania was to test the applicability of the radiomagnetotelluric technique for detecting oil contamination. The radiomagnetotelluric method was used successfully for the exploration of waste sites Zacher et al 1996;Tezkan 1999) and groundwater (Turberg et al 1994;Schwinn and Tezkan 1997), for engineering problems (Dupis and Choquier 1996), for archaeological research (Baum 1998), and for the detection of caves (Schiffbauer 2001). The radiomagnetotelluric method uses carrier waves from high-power civilian and military transmitters operating in a frequency range between 10 kHz and 300 kHz.…”

Section: B a S I C P R I N C I P L E S O F T H E R A D I O M A G N E mentioning

confidence: 99%

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A radiomagnetotelluric survey on an oil‐contaminated area near the Brazi Refinery, Romania

Tezkan

Georgescu

Fauzi

2005

Geophysical Prospecting

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A B S T R A C TScalar radiomagnetotelluric measurements were carried out on a contaminated test area close to the Brazi Refinery in Romania in order to detect and to monitor a 1 m thick oil layer expected at 5 m depth. Radio transmitters broadcasting in a frequency range from 10 kHz to 300 kHz were selected to observe the apparent resistivity and the phase data associated with the E-and B-polarizations. They were located parallel and perpendicular to the assumed strike direction of the contamination plume. The data were interpreted by a 2D inversion technique from which the conductivity structure of the area was derived. The 2D inversion models of all profiles on the contaminated area show a poor-conductivity zone above the groundwater table which could be associated with the oil contamination.A first attempt was also made to monitor the contaminated layer: the radiomagnetotelluric measurements were repeated on the same profiles a year later, but this time in a dry period, not in a rainy one. The 2D inversion results of the measurements in the dry period indicate that the high-resistivity layer moved closer to the surface. Additional reference measurements were then carried out on a non-contaminated area situated at a distance from the refinery, in the opposite direction to the flow of the groundwater. These reference measurements were used for the derivation of the unperturbed geology and they were also compared with the measurements of the contaminated test area. There is a significant difference in the frequency dependences of the apparent resistivities of the reference and contaminated areas, which could indicate a contamination at shallow depth. The 2D inversion results show the increase of resistivity at a depth of about 5 m beneath the contaminated area where the oil contamination is expected according to the information from the boreholes.

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Section: Basic Principles Of the Radiomagnetotelluric Methodsmentioning

confidence: 99%

Section: B a S I C P R I N C I P L E S O F T H E R A D I O M A G N E mentioning

confidence: 99%

A radiomagnetotelluric survey on an oil‐contaminated area near the Brazi Refinery, Romania

Tezkan

Georgescu

Fauzi

2005

Geophysical Prospecting

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“…Applications of TEM and DC resistivity as well as airborne electromagnetic methods were reviewed by several authors (Matias et al 1994, Nobes 1996, Tezkan 1999, Harinarayana 1999, Pellerin 2002) for solving a variety of problems related to hydrogeological investigations. The joint inversion of radiomagnetotellurics (RMT) and TEM was realized for groundwater prospecting by Schwinn and Tezkan (1997).…”

Section: Electromagnetic (Aem) Measurements Are Equally Feasiblementioning

confidence: 99%

“…) for solving a variety of problems related to hydrogeological investigations. The joint inversion of radiomagnetotellurics (RMT) and TEM was realized for groundwater prospecting by Schwinn and Tezkan ().…”

Section: Introductionmentioning

confidence: 99%

Appraisal of a new 1D weighted joint inversion of ground based and helicopter‐borne electromagnetic data

Sudha

Tezkan

Siemon

2014

Geophysical Prospecting

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In order to couple spatial data from frequency‐domain helicopter‐borne electromagnetics with electromagnetic measurements from ground geophysics (transient electromagnetics and radiomagnetotellurics), a common 1D weighted joint inversion algorithm for helicopter‐borne electromagnetics, transient electromagnetics and radiomagnetotellurics data has been developed. The depth of investigation of helicopter‐borne electromagnetics data is rather limited compared to time‐domain electromagnetics sounding methods on the ground. In order to improve the accuracy of model parameters of shallow depth as well as of greater depth, the helicopter‐borne electromagnetics, transient electromagnetics, and radiomagnetotellurics measurements can be combined by using a joint inversion methodology. The 1D joint inversion algorithm is tested for synthetic data of helicopter‐borne electromagnetics, transient electromagnetics and radiomagnetotellurics. The proposed concept of the joint inversion takes advantage of each method, thus providing the capability to resolve near surface (radiomagnetotellurics) and deeper electrical conductivity structures (transient electromagnetics) in combination with valuable spatial information (helicopter‐borne electromagnetics). Furthermore, the joint inversion has been applied on the field data (helicopter‐borne electromagnetics and transient electromagnetics) measured in the Cuxhaven area, Germany. In order to avoid the lessening of the resolution capacities of one data type, and thus balancing the use of inherent and ideally complementary information content, a parameter reweighting scheme that is based on the exploration depth ranges of the specific methods is proposed. A comparison of the conventional joint inversion algorithm, proposed by Jupp and Vozoff (), and of the newly developed algorithm is presented. The new algorithm employs the weighting on different model parameters differently. It is inferred from the synthetic and field data examples that the weighted joint inversion is more successful in explaining the subsurface than the classical joint inversion approach. In addition to this, the data fittings in weighted joint inversion are also improved.

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“…Geological and hydrogeological characterization is a difficult task when only scarce information is available but is critical for saltwater intrusion problems in which seawater migration is largely controlled by subsurface heterogeneity (Held et al 2005). Within the last decade, classic hydrogeological information has been increasingly complemented with sub-surface geophysical information that allows obtaining more accurate images of aquifer systems (Schwinn and Tezkan 1997;Unsworth et al 2000;Krivochieva and Chouteau 2003;Meju et al 2003;Kafri and Goldman 2005;; Mota and Monteiro dos Santos 2006). This type of studies has led to the development of the hydrogeophysics discipline (Rubin and Hubbard 2005), in which geophysical methods are used for mapping aquifer subsurface features, estimating properties of the aquifer system and monitoring distinct dynamic processes, such as seepage in the vadose zone, fluid flow direction, seawater intrusion, and pollutant migration.…”

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confidence: 99%

Integrating Hydrogeological and Geophysical Methods for the Characterization of a Deltaic Aquifer System

et al. 2011

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Groundwater management needs detailed aquifer characterization, especially in semiarid costal aquifer systems that are under hydrological pressure. Our study area is in the Tordera delta, northeastern coast of Spain, where a detrital fluvio-deltaic aquifer system has been developed above granitic basement. The main purpose of this study is to characterize the complex lithological structure and the seawater intrusion state by combining hydrological information, audiomagnetotelluric (AMT) and seismic reflection and refraction models. This allowed us to provide spatially continuous information about aquifer properties and processes. Thus, we have determined the thickness and continuity of the aquifer units, as well as the morphology and depth to the basement. The models revealed that the main seawater intrusion main path is found in the western deltaic area that coincides with an existing buried paleochannel. This new result explains the anomalously high chlorine concentrations observed in the deep semiconfined aquifer more than 1,500 m inland.

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1D joint inversion of radiomagnetotellluric (RMT) and transient-electromagnetic (TEM) data: an application for groundwater prospection in Grundfør, Denmark

Cited by 8 publications

References 0 publications

A radiomagnetotelluric survey on an oil‐contaminated area near the Brazi Refinery, Romania

A radiomagnetotelluric survey on an oil‐contaminated area near the Brazi Refinery, Romania

Appraisal of a new 1D weighted joint inversion of ground based and helicopter‐borne electromagnetic data

Integrating Hydrogeological and Geophysical Methods for the Characterization of a Deltaic Aquifer System

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