prioritization of sub-watershedsusing morphometric and landuse change analysis

prioritization of sub-watersheds is very important in the natural sources and watershed management. in this study, the morphometric parameter and landuse changes using rs and gis techniques used in order to identify erosion-prone sub-watersheds. the morphometric parameter such as basin relief, the linear parameters (drainage density, bifurcation ratio, length of overland flow, stream frequency and drainage texture) and the shape parameters (elongation ratio, compactness coefficient, basin circularity, shape index and form factor) were considered. the landuse map of talar watershed using rs technique provided into five land, rangeland, forest, residential, irrigated farming, dry land farming in 1999 and 2014. prioritization of sub-watersheds were implemented into four categories as very high, high, medium and low base on morphometric parameter, landuse change analysis and finally integration of morphometric parameter and land use change analysis. based on integration of morphometric and land use analysis 9 sub-watershed with 656/0% area were considered in the very high priority, 6 sub-watershed with 25.22% area in the high priority, 5 sub-watershed with 12.19% area in the medium priority and 1 sub-watershed with 2.03% area in the low priority. the most of basin area is located in the high priority that requires immediate action to erosion control and implementprotection programs.