CALCULATION OF SEDIMENT YIELD USING THE INTERO MODEL IN THE S1-3 WATERSHED OF THE SHIRINDAREH RIVER BASIN, IRAN

UDK 631.459(55 Shirin-Dareh Basin) Soil erosion is a natural process caused generally by the force of water (running water and raindrops) or wind. The process involves not only the detachment of soil particles (on- site), but also their transfer and deposition elsewhere in the river basin and out of the catchment (off-site). The assessment of soil erosion may be performed using and analyzing measurements data (sediment discharge series and soil erosion measurements) or applying various analytical models. It is well known fact that the measurements results are available only in a few experimental catchments in most of the countries all over the World and as a consequence the researchers are frequently using the analytical models. For calculation of the Sediment yield in the S1-3 Watershed of Iran we used the IntErO model (Spalevic, 2011) based on EPM method (Gavrilovic, 1972). Calculated peak discharge from the S1-3 Watershed was 87 m3s-1 for the incidence of 100 years and the net soil loss was 5,574 m³km-², specific 194 m³ km-² per year. Taking into consideration the results of this study and previous experiences of the other researchers, it was concluded that the IntErO Model may be applied to the other regions similar to Shirindareh basin for calculation of sediment yield and identification of critical areas in watersheds.