Abstract
An alternating electric current flowing along a cable of finite length situated between the surface and the bottom of a salty water layer generates a magnetic field whose analysis has several applications. It is useful in naval engineering for protecting ships from the threat of sea mines. It supports the analysis of submarine geophysical data collected either to define the degree of pollution of the sea bottom in shallow waters, or to prospect and monitor hydrocarbon reservoirs. The approach to the problem starts from an electric dipole in the frequency domain to describe the time variation of the vertical component of the magnetic induction field due to a line of alternating electric dipoles. The prospecting surveys relate to: a current source at the sea surface and a horizontal coil at the sea bottom to simulate a minesweeper campaign; and a current source and a horizontal coil at the sea bottom to simulate a submarine geophysical survey. The model is applicable to shallow or deep sea water environments. The analysis, modelling, and interpretation of the data can serve at least for three purposes: to define parameters for the magnetic sweeping of submarine mines; to map the conductivity of the submarine soil in shallow waters for the prevention and control of contamination; and as a first approach in the characterization of offshore oil reservoirs.
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