In hard rock terrain, fractured aquifers comprise the major
source of groundwater availability where the phreatic aquifer is de-saturated.
It is essential to understand the interconnectivity between phreatic aquifer
and deep fractured aquifer, for better water management strategy.
Identification of fracture zones in hard rock terrain and potential groundwater
source delineation had been a perennial problem in hydrology in the recent
past. In concurrence to this, understanding the groundwater flow through fracture
system has also been a challenge to hydrologists and geophysicists. The purpose
of this paper is to highlight the study executed over a small watershed area,
in a granite terrain, wherein an attempt was made to delineate and map the
fractured aquifer using numerical (factor) analysis of the conventional
vertical electrical sounding (VES) data. Delineation of fracture zones at
depths and mapping their geometry were obscure due to limitations in 1D
interpretation of VES data through curve matching technique. Factor analysis
for the same VES data was carried out and as a result, fractured granite
aquifer was deciphered. Also, based on the factor analysis, a fault was
deciphered in the study area bifurcating the fractured aquifer into two
segments which was later confirmed based on satellite photo data and 2D
resistivity imaging survey. This numerical approach of resistivity data
interpretation in concatenation with resistivity imaging or other techniques
would prove to be an effective tool in groundwater exploration.
Author(s) Details:
Rolland Andrade,
Central
Water & Power Research Station, Pune-24, India.
Please see the link here: https://stm.bookpi.org/EIEGES-V6/article/view/13111
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