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A new method for geoelectrical investigations underwater 1
Author(s) -
Baumgartner François
Publication year - 1996
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1996.tb00140.x
Subject(s) - underwater , depth sounding , geology , electrical resistivity and conductivity , economic geology , vertical electrical sounding , hydrogeology , geophysics , environmental geology , regional geology , signal (programming language) , current (fluid) , igneous petrology , gemology , induced polarization , engineering geology , geotechnical engineering , groundwater , seismology , aquifer , telmatology , electrical engineering , volcanism , computer science , engineering , oceanography , programming language , tectonics
A new electrical method is proposed for determining the apparent resistivity of multi‐earth layers located underwater. The method is based on direct current geoelectric sounding principles. A layered earth model is used to simulate the stratigraphic target. The measurement array is of pole‐pole type; it is located underwater and is orientated vertically. This particular electrode configuration is very useful when conventional electrical methods cannot be used, especially if the water depth becomes very important. The calculated apparent resistivity shows a substantial quality increase in the measured signal caused by the underwater targets, from which little or no response is measured using conventional surface electrode methods. In practice, however, different factors such as water stratification, underwater streams or meteorological conditions complicate the interpretation of the field results. A case study is presented, where field surveys carried out on Lake Geneva were interpreted using the calculated apparent resistivity master‐curves.