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Journal of Earth Sciences and Technology
EST 2023, 4(1), 18-30
Numerical Modeling of Geophysical Data in Resolving the Saline and Fresh Water Aquifers in West Coast Maharashtra
a. Indian Institute of Geomagnetism, New Panvel (W), Navi Mumbai 410218, India
b. Dr. KSK Geomagnetic Research Laboratory, IIG, Prayagraj 221505, India
ABSTRACT
Electrical resistivity and ground magnetic methods are widely used for identification of groundwater potential zones and in delineating the lateral and vertical distribution of sub-surface. Electrical resistivity technique can also differentiate the ingress of sea water into inlands thereby getting mixed up with fresh water bodies. The present studies are an attempt to delineate the saline water-fresh water interface and to demarcate the faults and lineaments in parts of Kudal-Vengurla and surrounding coastal region of western Maharashtra. A total of 30 vertical electrical soundings were carried out using the Schlumberger configuration with AB/2= 100m. The IPI2WIN algorithm based on automatic as well as manual interpretation of electrical sounding curves was used for analyzing the resistivity data set. The pseudo cross-sections of resistivity data over five profiles in the study region show the flow of saline water from the coastal side, partly controlled by the lineaments. A total of 122 ground magnetic data points were also acquired from the study region and the analysis was performed using SURFER software. From the observed magnetic anomaly map it appears that NW-SE trend are parallel to the present day coast line and can be associated with the coastal tectonics. The structural elements and magnetic sources within and below the trap covered region are delineated.