Services on Demand
Journal
Article
Indicators
Cited by SciELO
Access statistics
Related links
Cited by Google
Similars in SciELO
Similars in Google
Share
Earth Sciences Research Journal
Print version ISSN 1794-6190
Abstract
SRINIVASAMOORTHY, K et al. ELECTRICAL IMAGING TECHNIQUES FOR GROUNDWATER POLLUTION STUDIES: A CASE STUDY FROM TAMIL NADU STATE, SOUTH INDIA. Earth Sci. Res. J. [online]. 2009, vol.13, n.1, pp.30-39. ISSN 1794-6190.
An attempt was made to identify the extent of pollution in the aquifer matrix of Tirupur, a highly industrialized zone of Tamilnadu state, South India. Electrical imaging techniques were adopted with a Syscal Pro-96 system, for measuring apparent resistivity values using different electrodes separation. The first profile conducted at Valipalayam recorded a resistivity range of <10 Ã⢠m at a depth of 8 m, which indicates contamination of top soil due to discharge of effluents. An increase in resistivity >45.5 Ãâ¢mwas observed at a depth of 27 to 47 m indicating the possibility of contamination. The second profile conducted at Pethichettipuram indicates source of contamination at left end corner with a drop in resistivity <46.5 Ã⢠m at a depth of 7.91 m. A drop in resistivity <21.6 Ã⢠m was also observed at a depth of 11.5 m indicating a contaminated zone in deeper regolith. The third survey conducted in Palayakadu indicates contamination of regolith at a depth of 0 to 20 m with a resistivity less than 40 Ãâ¢m. The fourth survey at Chellapuram indicates contamination of overburden with resistivity >11.5 Ãâ¢m, to a depth of about 10 m. Five imaging surveys conducted across the contaminated sites reveals that shallower regoliths are highly contaminated and deeper aquifers are free from contamination except a few locations.
Keywords : Industrial zone; resistivity; Tomography; 2D model; regolith; contamination.