Quantitative morphometric analysis of Hirehalla sub-basin has been carried out using GIS and remote sensing techniques which are found to be very useful and powerful tools to compute and decipher different characteristics of the basin and its drainage network. Linear, areal and relief aspects have been computed and evaluated using topographical maps and remote sensing data. Results arrived at through computation of different parameters using GIS capabilities have enabled to understand the characteristics of the drainage network and topographical aspects which have a bearing on the hydrogeology of the sub-basin. The average bifurcation ratio (R b ) is 3.75, which means the drainage sub-basin is not dominated by structural control but geomorphologically controlled. The form factor (F f ) is 0.42 indicating that the sub-basin is more of elongated in shape with dendritic to sub-dendritic drainage pattern. The relief ratio (R r ) is 0.013 depicting the low to moderate relief and slope. All the quantitative morphometric parameters have been computed using standard formulae. Overall GIS-based analysis of all quantitative morphometric parameters suggests that, lithologically, the sub-basin is composed of compact and resistant basement rocks and has low degree of slope thus less prone to erosion. Three of the catchments of the study area are found to have a moderate possibility for the occurrence of flash floods which has a bearing on their groundwater-recharge and thus, their groundwater occurrence and potentiality. These studies are very important and useful for proper planning and management of groundwater resources.
The area under investigation covers the south-central part of Kaladgi series comprising of sedimentary rocks, mainly quartzarenites. From the geological point of view the study area comprises southcentral part of Kaladgi basin covering around 54 km2 which encompasses rocky hills of moderate height, showing three types of facies i.e., argillaceous, arenaceous and rudaceous. Among these three, arenaceous facies is more prominent in the area. These sedimentary rocks rest unconformably over gneisses. Detailed study of the rocks exposed are done by studying the petrological aspects of the rock samples which were subjected to microscopic studies, bifurcating different minerals and counting each parameter of the minerals which is plotted in the QFR ternary diagram and further illustrating the tectonic provenance of the area. Present work mainly focuses on the studies related to petrological, diagenesis and provenance of the study area where the rocks exposed in the vicinity are quartz arenites indicating that these sediments were deposited in a riverine condition.
The area under investigation covers the south-central part of Kaladgi series comprising of sedimentary rocks, mainly quartzarenites. From the geological point of view the study area comprises southcentral part of Kaladgi basin covering around 54 km2 which encompasses rocky hills of moderate height, showing three types of facies i.e., argillaceous, arenaceous and rudaceous. Among these three, arenaceous facies is more prominent in the area. These sedimentary rocks rest unconformably over gneisses. Detailed study of the rocks exposed are done by studying the petrological aspects of the rock samples which were subjected to microscopic studies, bifurcating different minerals and counting each parameter of the minerals which is plotted in the QFR ternary diagram and further illustrating the tectonic provenance of the area. Present work mainly focuses on the studies related to petrological, diagenesis and provenance of the study area where the rocks exposed in the vicinity are quartz arenites indicating that these sediments were deposited in a riverine condition.
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