Geology and Lineament mapping was carried out in Kolar River catchment area using Landsat-8 Satellite data. Digital image processing and visual image interpretation method was used to extract lineament in Arc GIS environment. The area comprised of 82 lineaments in the rocks of Alluvium, Deccan trap, and Bhander formation of upper vindhyan group. The extracted lineaments were statistically analyzed by applying Geospatial and Geostatistical analysis for determination of lengths, direction and density of the lineaments. Results show that the extracted lineaments were categorised in two groups on basis of length such as 58 minor less than 3 km and 24 major lineaments present. Lineament density was calculated by line density tool of geospatial analysis and it is categorised into 5 classes namely very good, good, moderate, low and very low density. The extracted lineament identified in this region are mainly parallel to drainage, scarp, fault and joint/ fractures etc. Of the total 82 lineaments in the study area, 57 were found in the basaltic terrain, 20 in Alluvium formation and 5 in Vindhyan formation. The maximum lineament found in basaltic terrain of Deccan trap were parallel to drainage and joints/fractures. It suggests that the trends are N - S, NNE - SSW, ENE - WSW, SE - SW and E - W axis. The principal direction of lineaments in the region are between NE- SW and NW - SE. The calculated lineaments from the study area were utilized for the groundwater recharge potential zone demarcation and characteristics of litho logical formation....
Authors: Anand Kumar, DC Gupta.