Morphotectonic analysis for watersheds of shikaripura taluk, shivamogga district, karnataka: using rs and gis

In this study examined the detail morph tectonic evaluation of watersheds of Shikaripurataluk with the significances on its implication for tectonic activity using remote sensing and GIS technique. In studies hill shaded images, stream networks were extracted from Cartosat-DEM data of 30m spatial resolution. Individual spectral bands of Landsat – 8 OLI data were processed and the layers are stacked into a single multispectral images using ERDAS, lineament map were extracted from ASTER using PCI Geomatics software and we extracted several Morphotectonic parameters such as Channel Sinuosity (The index value ranges between 1.0 to 1.5 indicates the sinuous shape of the river whereas the sinuosity value greater than 1.5 indicates the meandering river.), drainage basin asymmetry (The calculation of the transverse topographic symmetry of the current study area is carried out at seven locations and the values ranges from 0.043 to 0.289), mountain front sinuosity (The Smf values are less than 1.4 in the high tectonically active regions), basin elongation ratios. Qualitative analysis of morphotectonic parameter confirms that less to very less tectonic activity in the region result reveals that majorly dendritic and the parallel drainage pattern are observed which indicate that the fluvial system is mainly influenced by the slope of the terrain not by the lineament distribution of the areaand also argillite covers 71% of the total area. The Shikaripurataluk has majorly nine type of morphological units i.e. Ridges, Denudational hills, Residual hills, Pediment plain, Intermontane valley, Denudational slope, Structural hills, Water body, Valley floor. Therefore, structural entities and the tectonics have the contribution in the morphological classes which have the structural origin but no significant influence on the dynamic fluvial system is determined.