Sediment Yield in Relation to Hydrogeomorphological Charactristics of Venkatapur River Basin Using Gis and Remote Sensing

Abstract

Sediment Yield In Relation To Hydrogeomorphological Charactristics Of Venkatapur River Basin Using Gis And Remote Sensing Hydrogeomorphological units have been mapped using the IRS-1C, LISS III False Color Composite (FCC). The satellite images characteristics have been identified and assessed. The study area which belongs to the parts of Cauvery river basin around Manchanahalli, Karnataka state, India, exhibits diverse hydrogeomorphological conditions where the ground water regime is controlled mainly by topography and geology.

The main hydrogeomorphie units found in the area are alluvial plain, Pedi plain, pediment, valley fill, meander scar and water bodies. Groundwater in this hard rock terrain with remnants of palaeon channels is multivariate in nature because of its relation to topography, depth and extent of weathered material overlying bed rock and interconnection of joints and faults.

Conclusion

A quantitative assessment of soil loss is made using Universal Soil Loss Equation for Indravati catchment. All the thematic layers of R, K, LS and C are integrated to generate erosion risk map to find out spatial distribution of soil loss within the GIS environment. Since the USLE model does not take into account transportation and deposition, the actual sediment yield at the outlet is likely to be less than the estimated. Generated soil loss map is also able to indicate high erosion risk area which is useful to soil conservationist and decision makers.