REMOTE SENSING AND GIS TECHNIQUES TO IDENTIFY SOURCES OF GEOENVIRONMENTAL RESOURCE APPRAISAL OF SOUTHERN COASTAL HARD ROCK AQUIFERS
Tuticorin District coastal hard rock aquifer is located along the southeast coast of India, Tamil Nadu. This paper describes the aspect of geoenvironment and suitable groundwater zone using remote sensing and GIS techniques. Thematic maps for the study are prepared by visual interpretation of toposheets and enhanced fused data of LANDSAT satellite imagery on 1:50,000 scale using Arc GIS software. The quandary of the study is a representative case of overexploitation of groundwater resources, leading to the continuous overtiredness of the grained as well as the groundwater aquifer. In such situations topographic, land use/land cover, soil, geology, water level, water level fluctuation and geomorphological features provide useful clues for the selection of suitable zones. Identifying a good aquifer zone for groundwater exploration in coastal hard rock terrain is a very difficult in other region. The depth of water level in the district varied between -4.70 to 209.08 m AMSL and -1.23 to 208.25 m AMSL during PRM and POM. Spatial distribution of water table shows a higher negative gradience along southeast part of the study area during PRM compared to POM may be due to higher rainfall received from POM. The depth of water level fluctuation clearly indicates that of north eastern part of the study area has a very low fluctuation along the coastal region and southwestern part of the study area shows high fluctuation the above mean sea level during both season. In general, the coastal terrain shows that higher negative gradient in groundwater potential when compared to other region. This integrated studies help to find out the presence of hidden water bearing formations.
remote sensing and GIS, geology, water level, water level fluctuation
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