Morphometric analysis of Nanjangud taluk, Mysore District, Karnataka, India, using GIS Techniques
An attempt has been made to study drainage morphometry and its influence on hydrology of Nanjanagud taluk.For detailed study data for preparing DEM, aspect grid and slope maps. Geographic information system was used in evaluation of linear, areal and relief aspects of morphometric parameters. The study reveals that the elongated shape of area is mainly due to guiding effect of thrusting and faulting. In all forty one subbasin in Nanjangud taluk have been selected for the study. Quantitative morphometric analysis has been carried out for linear, relief, and aerial aspects for all the subbasin. The streams up to fourth order can be seen in all the subbasin. The morphometric analysis reveals that Hullahalli subbasin show lower value of drainage density, stream frequency, elongation ratio, relief ratio, infiltration number indicating highly permeable subsoil materials under dense vegetation cover. Except Hullahalli subbasin all the other subbasin showing fractured, resistant, permeable rocks and drainage network seems to be not affected by tectonic disturbances.
Morphometric, subbasin, Nanjanagud taluk, GIS, ARC info/view, Mysore district, Drainage characteristic.