The electrical profiling method is a powerful technique for mapping the near<br>surface geology. The increasing need for detailed and fast investigations of the protective<br>clay caps of the aquifers has renewed the focus on the method. In this context the<br>PA-CEP method was developed. The method applies an electrode array mounted on a tail,<br>and measurements are carried out continuously while actively pulling the electrodes. The<br>PA-CEP method has enabled fast and reliable profiling of large areas providing<br>surprisingly good insight into the stratification of the survey areas. However, the method<br>is a profiling technique with only few electrode arrays and therefore allows only limited<br>quantitative interpretation.<br>A new method, Pulled Array Continuous Vertical Electrical Sounding, PA-CVES,<br>is under development. Using this technique measurements are performed simultaneously<br>and continuously in several arrays. Hence the PA-CVES method provides vertical<br>resistivity soundings closely spaced along a profile line.<br>The measurements are interpreted with 1D smoothness constrained resistivity<br>models with many layers and fixed layer boundaries, and in the intervals where laterally<br>strongly varying data sets are encountered 2D interpretation techniques are applied.<br>The PA-CVES method as a continuous and fast method will have a great potential<br>in groundwater investigations, in prospecting for rawmaterials and in geotechnical<br>investigations, because it provides detailed and reliable geological interpretations in a<br>manner not obtained by traditional techniques.


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