The electrical resistivity gives information on soil thickness and the thickness
of the weathered... more The electrical resistivity gives information on soil thickness and the thickness of the weathered and fractured rocks. It also gives an estimate of the depth to the water table and identifies multiple aquifer systems. In the present investigation carried out in November 2009, an attempt is made to study the occurrence and movement of groundwater along the tract Guhagar to Chiplun between latitudes 17.47° and 17.50°N, and longitudes 73.25° and 73.45°E with the help of resistivity measurements. The study area is dominated by basaltic flows belonging to the Deccan Traps where the basaltic flows constitute the main aquifers. Analysis of electrical soundings represented five to six layer earth sections. The top soil resistivity ranges from 0.1 to 1.5 ohm-m towards the western margin of the study area, representing high salt content near Guhagar, whereas the eastern margin shows top layer resistivity between 24 and 42 ohm-m indicating weathered formations. However, the central portion has resistivities ranging from 168 to 2672 ohm-m due to the hard and compact formations. Isoresistivity contours have been presented to show the resistivity distributions at six subsurface horizons. Higher resistivities are observed at shallow depths in the eastern part and at deeper horizons in the western part. This reveals that the shallow aquifers are present on the western side and the deep aquifers towards east. The central portion shows moderate depth for aquifers. Subsurface resistivity distribution has also been shown along four cross sections identifying fracture zones which have been confirmed by ground magnetic studies.
The electrical resistivity gives information on soil thickness and the thickness
of the weathered... more The electrical resistivity gives information on soil thickness and the thickness of the weathered and fractured rocks. It also gives an estimate of the depth to the water table and identifies multiple aquifer systems. In the present investigation carried out in November 2009, an attempt is made to study the occurrence and movement of groundwater along the tract Guhagar to Chiplun between latitudes 17.47° and 17.50°N, and longitudes 73.25° and 73.45°E with the help of resistivity measurements. The study area is dominated by basaltic flows belonging to the Deccan Traps where the basaltic flows constitute the main aquifers. Analysis of electrical soundings represented five to six layer earth sections. The top soil resistivity ranges from 0.1 to 1.5 ohm-m towards the western margin of the study area, representing high salt content near Guhagar, whereas the eastern margin shows top layer resistivity between 24 and 42 ohm-m indicating weathered formations. However, the central portion has resistivities ranging from 168 to 2672 ohm-m due to the hard and compact formations. Isoresistivity contours have been presented to show the resistivity distributions at six subsurface horizons. Higher resistivities are observed at shallow depths in the eastern part and at deeper horizons in the western part. This reveals that the shallow aquifers are present on the western side and the deep aquifers towards east. The central portion shows moderate depth for aquifers. Subsurface resistivity distribution has also been shown along four cross sections identifying fracture zones which have been confirmed by ground magnetic studies.
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Papers by G. Gupta
of the weathered and fractured rocks. It also gives an estimate of the depth to the
water table and identifies multiple aquifer systems. In the present investigation
carried out in November 2009, an attempt is made to study the occurrence and
movement of groundwater along the tract Guhagar to Chiplun between latitudes
17.47° and 17.50°N, and longitudes 73.25° and 73.45°E with the help of resistivity
measurements. The study area is dominated by basaltic flows belonging to the
Deccan Traps where the basaltic flows constitute the main aquifers. Analysis of
electrical soundings represented five to six layer earth sections. The top soil
resistivity ranges from 0.1 to 1.5 ohm-m towards the western margin of the
study area, representing high salt content near Guhagar, whereas the eastern
margin shows top layer resistivity between 24 and 42 ohm-m indicating weathered
formations. However, the central portion has resistivities ranging from 168 to
2672 ohm-m due to the hard and compact formations. Isoresistivity contours
have been presented to show the resistivity distributions at six subsurface horizons.
Higher resistivities are observed at shallow depths in the eastern part and at
deeper horizons in the western part. This reveals that the shallow aquifers are
present on the western side and the deep aquifers towards east. The central portion
shows moderate depth for aquifers. Subsurface resistivity distribution has also
been shown along four cross sections identifying fracture zones which have
been confirmed by ground magnetic studies.
of the weathered and fractured rocks. It also gives an estimate of the depth to the
water table and identifies multiple aquifer systems. In the present investigation
carried out in November 2009, an attempt is made to study the occurrence and
movement of groundwater along the tract Guhagar to Chiplun between latitudes
17.47° and 17.50°N, and longitudes 73.25° and 73.45°E with the help of resistivity
measurements. The study area is dominated by basaltic flows belonging to the
Deccan Traps where the basaltic flows constitute the main aquifers. Analysis of
electrical soundings represented five to six layer earth sections. The top soil
resistivity ranges from 0.1 to 1.5 ohm-m towards the western margin of the
study area, representing high salt content near Guhagar, whereas the eastern
margin shows top layer resistivity between 24 and 42 ohm-m indicating weathered
formations. However, the central portion has resistivities ranging from 168 to
2672 ohm-m due to the hard and compact formations. Isoresistivity contours
have been presented to show the resistivity distributions at six subsurface horizons.
Higher resistivities are observed at shallow depths in the eastern part and at
deeper horizons in the western part. This reveals that the shallow aquifers are
present on the western side and the deep aquifers towards east. The central portion
shows moderate depth for aquifers. Subsurface resistivity distribution has also
been shown along four cross sections identifying fracture zones which have
been confirmed by ground magnetic studies.