nonlinear estimation of aquifer parameters from surficial resistivity measurements
M.Manoj Kumar,P.Ponnarasu
Published in International Journal of Advanced Research in Civil,Structural,Environmental and Infrastructure Engineering and Developing
ISSN: 2320-723X Impact Factor:1.7 Volume:3 Issue:1 Year: 01 March,2017 Pages:282-288
Abstract
The present study is focused on an examination of the correlation relationships for hydraulic permeability and transmissivity with electrical resistivity in a range of frac- tured and alluvial aquifers. The observed permeability data for fractured rock aquiferat some locations is correlated nonlinearly with electrical resistivity of the aquifers esti- mated from resistivity sounding data and it is found that the permeability of the aquifer in this region exponentially decreases with increase in resistivity. Permeability of the hard rock aquifer within the weathered zone and alluvium aquifers increases exponen- tially with increase in resistivity, and transmissivity decreases exponentially. However,in case of fracture rock and sandwiched aquifers, transmissivity increases exponen- tially with increase in resistivity. An attempt has been made to find general functional relationship between hydraulic parameters and resistivity of the aquifer, and therefore, published and observed data from India and other parts of the world has been taken under consideration. It is found that for fracture rock and alluvium aquifers, permeabilityand the transmissivity are best defined as the exponential functions of aquifer resistiv- ity. The application of electrical parameters obtained from resistivity data for evaluation of hydraulic parameters has been demonstrated in detail within the Osmania Univer- sity Campus, Hyderabad (India). The empirical relations between aquifer parameters and resistivity are established for transforming resistivity distribution into permeabilityand transmissivity of the aquifer. The information thus obtained from resistivity data on permeability of the aquifer and transmissivity distribution in the study area can be used for optimal use and assessment of water resources.
Kewords
hydraulic permeability, transmissivity, electrical resistivity, aquifer.
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