One of the major contemporary applications of the controlled source EM methods involves<br>mapping of subsurface pollution plumes. Generally such plumes occur in the form of<br>thin layers that make good resistive or conductive targets depending on electrical characteristics<br>of the plume and the polluted zone. The problem of mapping pollution plumes is thus<br>well-suited for the application of the electrical or electromagnetic (EM) methods. Since such<br>problems are mostly encountered in industrial and/or populated areas, with limited space<br>available for surveys, the inductive EM methods are found to be particularly useful.<br>A comparative study of the performance of various dipole EM systems in the mapping of<br>pollution plumes in different, geoelectrical scenarios is made. A small section is also devoted<br>to the comparison of resolutions obtained by employing dipolar and large loop transmitters<br>considering joint-inversion with D.C. (Schulumberger) data. Singular value decomposition<br>analyses are performed to arrive at the quantitative estimates of the resolution of the target<br>plume obtained by various ERI systems.


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