Vertical electrical sounding (VES) and multi-electrode resistivity in environmental impact assessment studies over some selected lakes: A case study

  • Sundararajan N
  • Sankaran S
  • Al-Hosni T
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Abstract

A combined geophysical investigation consisting of vertical electrical
sounding (VES) and multielectrode system was carried out to map the
subsurface resistivity in all major lakes which are highly polluted by
the discharge of sewage and other chemical effluents in greater
Hyderabad, India. The structural features identified in the study area
play a major role in groundwater flow and storage. The interpretation of
geophysical data and lithologs indicates that a silt/clay zone
(predominantly silt) has a thickness of 5-10 m all along the drainage
from Patelcheruvu to the Musi River. The silt/clay zone inferred close
to the lakes is a mixture of clay, silt and sand with more silt content
as indicated from the lithologs during drilling. The low resistivity
values obtained can be attributed to the pollutant accumulated in the
silt which can reduce the resistivity values. Further, the TDS of the
water samples in these wells are more than 1,000 mg/l which further
confirms the above scenario. The pollution spread is less in the
upstream areas whereas it is more in the downstream which can be
attributed to the shallow water table conditions and also due to the
interaction of surface water and groundwater.

Author-supplied keywords

  • Chemical effluents
  • Clay
  • Drainage
  • Groundwater
  • Lithologs
  • Multielectrode system
  • Pollution
  • Resistivity
  • Silt
  • Vertical electrical sounding

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