ELECTRICAL IMAGING TECHNIQUES FOR GROUNDWATER POLLUTION STUDIES: A CASE STUDY FROM TAMIL NADU STATE, SOUTH INDIA

Earth sciences research journal

Vasantavigar, MP¹  Vijayaraghavan, K¹  ajivganthi, R¹  Srinivasamoorthy, K¹  Chidambaram, S¹  Sarma, VS² 

[1] Annamalai University, Annamalainagar;National Geophysical Research Institute

关键词: Industrial zone;    resistivity;    Tomography;    2D model;    regolith;    contamination.;   

DOI  :  

学科分类：天文学(综合)

来源: Universidad Nacional de Colombia * Departamento de Geociencias

【 摘 要 】

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 Ù m at a depth of 8 m, which indicates contamination of top soil due to discharge of effluents. An increase in resistivity >45.5 Ùmwas 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 Ù m at a depth of 7.91 m. A drop in resistivity <21.6 Ù 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 Ùm. The fourth survey at Chellapuram indicates contamination of overburden with resistivity >11.5 Ùm, 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.

【 授权许可】

CC BY