The study uses GIS techniques for spatial discretization of the Karso catchment into time-area segments to be used in numerical solutions of the governing differential equations for rainfall-runoff-erosion process. Various thematic layers such as soil, land use, slope, flow direction and Digital Elevation Model (DEM) were generated for the catchment using various tools available in GIS. These thematic layers were further utilized to generate attribute information such as Manning’s n, USLE K and C parameters for use in the rainfall-runoff-soil erosion model.
Based on DEM and related attribute information of the catchment, time-area map of the catchment was prepared and used for spatial discretization of the catchment. Rainfall abstraction has been carried out by phi-index method. The excess rainfall falling on each of the time-area segments was routed to the outlet by means of numerical solutions of kinematic wave equation using fully implicit four-point finite difference scheme.
The sediment yield has been estimated by solving sediment continuity equation using fully implicit finite difference scheme. The comparison of results indicated applicability of this modeling concept for Karso catchment.
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