Document Type : Research Article
Land use map was prepared using the maximum likelihood method. Training data were used to evaluate the accuracy of the results. Then, the most important methods of accuracy assessment, including total accuracy and classification kappa coefficient, were extracted, which for 1987, 2010 and 2019, was respectively, for total accuracy of 95, 98 and 95 and kappa coefficient of 0.93, 0.96 and 0.93. Erosion and sedimentation zoning maps were performed using the resulting land use maps, and factors including slope, lithology, soil and precipitation were performed using the EPM method. The results showed that one of the most important factors in the Kala aji watershed is the loss of rangeland vegetation and its conversion into agricultural land. According to the hypothesis, the role of land use changes in the amount and increase of erosion and sediment was significantly determined, that is, with the change of land use, the amount of erosion and sediment has also increased. The reasons for the increase in the amount of sediment in the Kala aji area are the development of agricultural land use levels and the decrease in rangeland levels between 1987 and 2019 by 16.83% compared to 1987. These changes have reduced the important role of rangelands and vegetation of Kalaaji watershed and have increased the amount of sediment in the outflow of sub-watersheds. Based on the obtained results, the total amount of special sediment was related to the period of 1987 (4353 cubic meters), which increased to 5164 cubic meters in 2019, which indicates the changes in land use that occurred in the watershed.