Study of sediment yield potential of Khor and Sefidarak basins with special reference to the difference between EPM and MPSIAC models, Hashtgerd, Karaj

Nowadays، erosionand sedimentation processes are studied in the sciences such as geology، natural geography and watershed management. Soil conservation and prevention of rapid filling of reservoir dam are very important problems. Accordingly، rate of erosion، estimation of annual sediment production and sediment yield of catchment basin using experimental models are intriguing for researchers. In this research، Khor and Sefidarak watershed basin in Alborz provenance are selected as case studies. The purpose of this project is to estimate the annual delivery sediment in these basins، using EPM and MPSIAC models، and make comparisons between them. In this relation، after field surveying، lithology، soil، vegetation cover and other maps، for each subbasin were used and carried out the compilation of all information. Corresponding tables were prepared for quantitative calculation of each parameter for study of erosion using MPSIAC model and classification of erosion intensity was carried out using EPM model. Average specific sediment yield for the seven basins in two models MPSIAC and EPM is 3. 28 and 1. 99 cubic meters per hectare per year (respectively) and Average specific erosion in these two models MPSIAC and EPM is 11. 0 and 3. 93 cubic meters per hectare per year.