Estimation of erosion and sediment production using GIS and EPM model (Case study area: Ghomrood-Aligudarz Basin)

One of the most important issues that causes soil erosion in Iran is the problems of management and control of the erosion of the watersheds of the country, the lack of statistical data to accurately estimate the extent of erosion. Therefore, this research is aimed at estimating the rate of erosion and sediment production in Ghomrood-Aligudarz Basin using experimental model EPM (GIS) to control soil erosion. Initially, in this research, data was obtained through library and field resources, existing maps, and weather stations statistics. After importing maps in the ARCGIS software environment using the standard tables provided in the EPM model, the concessions are proportional to the catchment area and, by combining the layers with respect to the relationships presented in the EPM model, the zoning map of the severity of erosion in the watershed of Qomrood - Oligodarz was calculated. The results showed that with EPM method, the specific erosion rate of 24.529 m 3 / km / year and total erosion of the basin were estimated at 9257 m3 / m3 / m3 and, according to the erosion intensity of the studied basin, according to to the EPM method in the erosion class Extreme (V).