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Pulled Array Continuous Vertical Electrical Sounding (Pa-Cites) With An Additional Inductive Source.Normal access

Authors: Niels B. Christensen and Kurt Sørensen
Event name: 9th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Innovations In Electrical And Electromagnetic Methods
Publication date: 28 April 1996
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.55Mb )

Summary:
Electrical and electromagnetic profiling methods are used extensively in environmental
geophysical investigations for many different purposes. The PA-CVES method (Pulled-
Array Continuous Vertical Electrical Sounding), where a tail of electrodes is towed behind
a small vehicle while continuously measuring in many electrode configurations, has been
used extensively for mapping the vulnerabilty of aquifers. Measurements are done for
every 1 metre and lo-15 km of profile can be made in one day.
This paper presents a theoretical study of the resolution capabilities of PA-CVES
measurements, as they are now performed, and an experimental design study for
including an inductive source in the measuring equipment. The joint interpretation of the
galvanic data set of ordinary PA-CVES measuements and a small number of induc.tive
data from a horizontal magnetic dipole source will significantly enhance the resolution
capabilities of the data set.
The study is carried out by analyzing the uncertainty of the model parameters of a onedimensional
three layer model using the covariance matrix of the inversion problem.

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