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Demarcation of High Mineralization Zones Identified with Respect to Aquifer Type using GIS in and around Vellar Basin, Tamil Nadu, India
K. D. Madhavan
Consultant (Geomatics)
Email: gis_mad@yahoo.co.uk,
madhavandhanabalan@yahoo.com
Abstract
A Geological formation yields significant quantities of water are defined as an aquifer.
An aquifer may be defined as a formation that contains sufficient saturated permeable material to yield significance quantities of water to wells and springs. This has an ability to store and to transmit water. Typical example: Unconsolidated Sands and Gravel.
Groundwater reservoir and water bearing formation are the synonyms of aquifers. Aquifers are generally, a really extensive and may be overlain and underlain by impermeable material called confining bed. There are various types of confining beds such as confined aquifer, unconfined aquifer, upper and lower confined aquifer etc.,
The integrated features of two thematic maps is obtained over this composite map is overlaid a third map and so on., so that a final composite map is obtained. Each polygons in the final composite map is associated with a particular set of parameter considered in the study upper confined aquifer in Total dissolved solids, Lower confined aquifer in Total dissolved solids, Upper confined aquifer in Chloride, Lower confined aquifer in Chloride, Phreatic aquifer in Chloride and Phreatic aquifer in Total dissolved solids. The Evaluation of each polygon as a potential zone for High Mineralization is based on the added values of scores of various themes.
In the final composite map there are nearly 200 polygons are range into 5 classes each representing a zone namely, Very high, high, Medium, less, and very less. The final thematic map showing the potential zones for high mineralization zone at in and around Vellar basin, .it can be seen that the area nearer to the coastal area and inland coastal area are highly mineralization zone.
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