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Kumar, Dewashish
- Evaluation of Heterogeneous Aquifers in Hard Rocks from Resistivity Sounding Data in Parts of Kalmeshwar Taluk of Nagpur District, India
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Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Current Science, Vol 107, No 7 (2014), Pagination: 1137-1145Abstract
Interpretation of vertical electrical sounding (VES) data coupled with the estimation of coefficient of anisotropy (λ) in parts of Kalmeshwar taluk, Nagpur district, Maharashtra, India has yielded vital information on the characteristics of subsurface basaltic aquifers. The coefficient of anisotropy estimated at 22 sites from VES data has shown variation between 1 and 1.87, which in turn reveals the anisotropic character of the basaltic aquifers. The estimated fracture porosity from the interpreted parameters and specific conductance of groundwater within the region varies from 0.007% to ∼2%, indicating different degrees of water saturation within the basaltic flows. The interpreted true resistivity ∼10-35 Ω.m corroborates well with the zones of high porosity and λ further substantiates the presence of exploitable groundwater resources within the region.Keywords
Anisotropy, Hard Rock Aquifers, Fracture, Porosity, Vertical Electrical Sounding.Full Text
- Resolution Enhancement for Geoelectrical Layer Interpretation of Electrical Resistivity Model from Composite Dataset:Implication from Physical Model Studies
Abstract Views :223 |
PDF Views:78
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Current Science, Vol 116, No 8 (2019), Pagination: 1356-1362Abstract
Besides the high resolution offered by HERT, the resistivity models obtained using different electrode arrays differ significantly in geological structure and resistivity range. We combine the apparent resistivity data from multiple arrays to provide single resistivity model of high resolution as ‘composite method’. Initially, the method was tested on physical model data obtained over horizontal marble sheet kept in water. The parameters of target (resistivity, geometry, thickness) noticed in the resistivity model corresponding to composite method are appropriately matching with the true parameters. Finally, the method was applied to the data from Mahabubnagar, Telangana, India for groundwater studies. The resistivity model obtained using the proposed method has shown good match with regional hydro-geology and borehole data. The results from physical model as well as field data suggest plausible resolution enhancement in composite methodology for resolving thin layer(s) in 2D and 3D electrical resistivity tomography and induced polarization (IP) studies.Keywords
Electrical Resistivity Tomography, Groundwater, Induced Polarization, Physical Model Studies, Resolution Enhancement.Full Text
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