Quantitative morphometric infer in the hard rock Terrain based on SRTM-DEM and GIS-Chintamani Watershed, Chikkaballapur District, Karnataka, India

摘要

The Chikkaballapur district has been identified as one of the chronically drought-prone areas. The Rainfall data indicate that out of 11 consecutive years, 8-9 years of the district has faced the drought. The occurrence of drought is on several factors, such as unorganized cropping method, soil types, lack of conservation of water, drainage system, etc. There are no perennial rivers in Chickballapur district. In this study area, a part of the Palar river basin originates at Ambajidurga hillocks in Chintamani taluk and flows in NW-SE direction. The drainage pattern in the study area varies from dendritic to sub-dendritic and is designated as a fifth-order stream. The order of the stream is mainly regulated by the physiography and lithologi-cal conditions of the region. The drainage density (0.564 km/km~2) and drainage texture values suggest that the study area comprises primarily Precambrian age impermeable rocks. The higher mean bifurcation ratio is indicative of good structural control over drainage growth. Values of the form factor, circulatory ratio, and elongation ratio indicate the sub-watersheds are elongated in shape. These quantitative forecasts can aid in the achievement and implementation of long-term strategies to tackle drought and areas affected to prepare adequate groundwater management plans.