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Soil is a living, dynamic and non-renewable source in lifetime which is vital for food production and the global balance of ecosystems. Every year more than 75 billion tons of soil erodes from the surface of earth. Taking care for this, appropriate methods needed to prevent erosion and sediment movement, which in its turn requires the presence of information about erosion intensity in the basin. Lack of statistical data and information on soil erosion and sediment production in Zemkan basin located in the West of Kermanshah Province, is an issue that paved the way to carry out this study with the aim of identification of erosion rate and sedimentation production and exploring sensitive areas of erosion. To achieve the above-mentioned aim, there was used the erosion potential method (EPM) using of geographical information system (GIS) to reduce errors and increase the relative accuracy in the analysis of the model. Required data in this study were prepared through field observations, existing maps, statistics of meteorological and hydrometric stations and library resources. After inputting maps into the ArcGIS software environment and geo-referencing them, required layer was digitized and there created database for them. Finally, using standard tables provided in the EPM model, accordant values for the basin extracted and incorporated into the layers according to the relations given in EPM model, map of erosion intensity zoning, erosion and sediment ratio calculated for the basin. Results showed that the rates of especial erosion (WSP) and especial sediment are (GSP), 2742.02 and 1005.55 m3/Km2/y respectively. Class and intensity of erodibility of basin were also identified as very intensive (V). Therefore, different policies of erosion control in the basin are necessary.

CALCULATION OF SEDIMENT YIELD IN THE ZEMKAN RIVER BASIN OF IRAN USING ANALYTICAL METHODS AND GIS CONCEPT