Evaluation of soil erosion and sediment yield estimation various empirical model by observation values (Case study: Babolroud watershed, Mazandaran Provienc)

In this study where done in Babolroud basin, seven models include MPSIAC, EPM, Fournier, Douglas, Kirkby, Geomorphology and Hydrophysical was evaluated to determine the best model  for estimation of soil erosion and sediment yield. These models have not been compared together as integrated in the previous researches. The zoning soil erosion intensity map was prepared for each model using GIS. The estimated sediment yield compared with the observed data (43 years data of Ghorantalar station) by statistical evaluation criteria's such as relative and absolute difference and correlation coefficient. Results showed that MPSIAC model in Lowland and Azar sub-basins, Geomorphology model in Karsang and Esklim sub-basins and EPM model in Babolak sub-basin have more reasonable precision and efficiency than other models. Finally, with investigation of the observed sediment data in Babolroud basin, MPSIAC model with the relative difference of 7.932% (76659.896 ton/y) and correlation coefficient of 0.86 was most appropriate model to estimate soil erosion rate and sediment yield in the Babolroud basin.