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Feasibility studies for major projects |
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Planning and development
of major projects |
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Capital assets
management |
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Planning and implementation of site audits. |
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Methods
Geoelectrical method
The geoelectrical method provides a comprehensive tomography of the underground environment of a site by injecting continuous current into the ground using a pair of electrodes and recording the electric resistivity at certain depths using a second set of electrodes (usually 8 pairs).
The physical property that characterizes different layers and objects that is relevant for this method is the electrical resistivity. Subsoil layers and buried objects are known to be characterized by certain resistivity values and when conducting geoelectrical measurements, certain resistivity values are obtained for different depths and areas of a site. By correlating these two types of information, after data processing and interpretation using specific software, an underground model of a site can be attained, presenting the thickness of each subsoil layer and the exact location of any buried objects. The modeled results are pseudosections that present the electrical resistivity correlated to the depth of investigation. Blue is specific for areas characterized by low resistivity (high electrical conductivity), whilst the areas of high resistivity (low electrical conductivity) are represented using red.
The results of the geoelectrical method can be used in many applications, like GeoScan or GeoTechnic and is commonly combined with other methods and techniques (magnetic profiling, borehole drilling) in order for the best over-all results to be attained and sites can be best characterized.
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The picture to the left shows consecutive data processing of pseudosections.
The blue anomal area is in fact a pipeline. |
See also:
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