Gradient and Mid-Point-Referred measurements for multi-channel 2D resistivity imaging

Auken, Esben; Thomsen, Peter; Sørensen, Karsten Engsig

doi:10.3997/2214-4609.201406177

Cited by 15 publications

(6 citation statements)

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“…When mapping with the TEM system, the soundings are generally placed with approximately 16–25 measuring points per square kilometre (Sørensen et al . ). To avoid corrupted data, a buffer zone of 100–150 m is kept on either side of electrical power lines, roads, buildings, etc.…”

Section: Introductionmentioning

confidence: 97%

“…The limitations of this system have encouraged the development of new systems such as the pulled array transient electromagnetic (PATEM) system (Sørensen et al . , ; Sørensen ) and the high‐moment transient electromagnetic (HiTEM) system (Danielsen et al . ).…”

Section: Introductionmentioning

confidence: 99%

“…Not only is a large amount of geophysical data being collected in Denmark, but considerable effort is also being expended interpreting the geophysical data (Auken et al . , ; Møller et al . ) and training people in understanding the significance of the data (Auken et al .…”

Section: Introductionmentioning

confidence: 99%

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Using airborne electromagnetics surveys to investigate the hydrogeology of an area near Nyborg, Denmark

Smith¹,

O'Connell²,

Poulsen

2004

Near Surface Geophysics

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A time‐domain airborne electromagnetic survey was flown in the County of Fyn, Denmark, immediately west of the city of Nyborg as a quick and efficient means of providing resistivity information for the development of a hydrogeological model. The bedrock geology is typified by a thick limestone overlain by a sequence of marine marl and a Quaternary moraine of variable thickness and composition. The limestone is the largest aquifer within the area and is used to supply water for Nyborg. The upper 100 m or so of the limestone generally contain fresh water and below that the groundwater is saline. The boundary between the resistive fresh water and the conductive saline water was the target of the airborne electromagnetic survey. Man‐made structures can strongly impact electromagnetic measurements; however, they can be minimized using two tactics: (1) masking the results around large power lines, and (2) non‐linear filtering of any perturbations in the interpretation that are the consequence of these or other structures. The latter strategy is possible because of the dense areal coverage provided by the airborne survey, and is particularly useful when a regional overview is required. Resistivity sections derived from the airborne electromagnetic data indicate a resistive zone of till, diluvial sand and freshwater limestone of variable thickness above a deeper conductive zone of saline water. A conductive layer within the moraine, assumed to be clay or marl, is also occasionally indicated. We used a two‐layer model to estimate the depth to the freshwater/saline‐water interface. Where ground soundings have been made, the depth estimates from the ground and airborne data agree. The depth estimates from the airborne data can be used to infer the thickness of the freshwater aquifer, either locally or regionally.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Using airborne electromagnetics surveys to investigate the hydrogeology of an area near Nyborg, Denmark

Smith¹,

O'Connell²,

Poulsen

2004

Near Surface Geophysics

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“…Diverse LCI techniques have successfully been adapted to geophysical data (e.g. Auken et al, 2000 (pulled array DC data); (2-D geoelectrical data); Monteiro Santos, 2004 (ground frequencydomain electromagnetic (EM) data); (airborne time-domain EM data); Auken et al, 2005 (1-D geoelectrical data); (geoelectrical and borehole data); Wisén and Christiansen, 2005 (geoelectrical and surface wave seismic data); Tartaras and Beamish, 2006 (fixedwing frequency-domain EM data)). The LCI procedure used here is adapted to a one-dimensional inversion code developed at the HydroGeophysics Group (HGG) of the University of Aarhus, Denmark (Auken et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Laterally constrained inversion of helicopter-borne frequency-domain electromagnetic data

Siemon

Auken

Christiansen

2009

Journal of Applied Geophysics

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“…Electrical resistivity surveys are commonly used for geotechnical investigations and environmental surveys (Loke, 1999). Due to its efficiency and effectiveness in producing images of the subsurface, resistivity-imaging methods have now becomes more popular in electrical exploration (Dahlin and Zhou, 2002). The two dimensional (2D) direct current (DC) electrical resistivity methods measure the apparent resistivity of the subsurface, which can be inverted to develop a model of the subsurface structure and stratigraphy in terms of its electrical properties (Loke, 2003).…”

Section: Introductionmentioning

confidence: 99%

Delineation of leachate plumes at two waste disposal sites, Selangor

Samsudin¹,

A.Rahim²,

Zuhairi³

et al. 2007

BGSM

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This paper discusses the results of two-dimensional (2D) direct current resistivity imaging surveys, which were conducted to identify and delineate the extent of contaminated land and leachate plumes as well as to assess the capability of the 2D resistivity as a pre-characterization tool for tracing the properties of disposed waste and its severity underneath capped landfill sites. The study was confined to two different municipal waste disposal sites, namely Ampar Tenang opentipping site and Bukit Kemuning capped landfill. There are a total of eleven 2D-resistivity survey lines. Depending on site specification, the lines were distributed as 2 and 9 lines at the Bukit Kemuning and Ampar Tenang sites, respectively. In this study, the 2D resistivity imaging was carried out using SAS1000 & SAS4000 resistivity meters and ABEM LUND automatic electrode selector system. The objectives of the study were to delineate the locations of the contaminated subsoil and groundwater in terms of leachate plumes. Generally, the results of measured resistivity values obtained from the two sites defined the contaminated leachate plumes as electrically conductive anomalies of relatively low resistivity value of less than 10 Ωm. In addition, the observed resistivity values of 2D image profile, which were measured at the top of an excavated part of the Bukit Kemuning landfill, were found to be in a good agreement with the actual profile as regards to characteristics, degree of decomposition, depth and thickness of the disposed wastes, as well as thicknesses of both the cap and liner of the landfill. This proves the efficiency of using the 2D direct current resistivity technique in waste disposal site investigations.Abstrak: Kertas kerja ini membincangkan keputusan survei keberintangan geoelektrik dua dimensa yang dijalankan untuk mengenal pasti and menentukan tahap pencemaran tanah serta larut lesap disamping menilai keberkesanan kaedah keberintangan 2-D sebagai alat pencirian awal untuk mengkaji sifat sisa buangan serta tahap pencemarannya dibawah permukaan tapak buangan tertutup. Kajian ini tertumpu hanya kepada dua tapak buangan iaitu Tapak buangan sampah terbuka Ampar Tenang dan tapak buangan sampah tertutup Bukit Kemuning. Sebanyak 12 garis survei keberintangan telah dibuat iaitu dua di Bukit Kemuning dan 9 garis di Ampar Tenang. Dalam kajian ini, survei keberintangan telah dilakukan dengan menggunakan meter keberintangan SAS1000 dan SAS4000 dan sistem pemilih elektrod LUND ABEM. Matlamat kajian telah dapat dicapai dalam menentukan kedudukan tanah dan air bawah tanah yang tercemar. Secara umumnya daripada pengukuran keberintangan didua tapak pembuangan sampah, di dapati nilai keberintangan larut lesap menunjukan anomali kekonduksian elektrik dengan nilai keberintangan yang relatif rendah daripada 10 Ωm. Selain itu profil imej keberintangan geoelektrik 2-D yang diukur di tapak pembuangan sisa Bukit Kemuning didapati bersesuaian dengan profil sebenar dari aspek pencirian, darjah penguraian, kedalaman dan ketebalan sisa buangan serta k...

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Gradient and Mid-Point-Referred measurements for multi-channel 2D resistivity imaging

Cited by 15 publications

References 0 publications

Using airborne electromagnetics surveys to investigate the hydrogeology of an area near Nyborg, Denmark

Using airborne electromagnetics surveys to investigate the hydrogeology of an area near Nyborg, Denmark

Laterally constrained inversion of helicopter-borne frequency-domain electromagnetic data

Delineation of leachate plumes at two waste disposal sites, Selangor

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