Sediment and erosion studies using experimental models and compare them using statistical methods in Kan and Darakeh subbasins

One of the major problems in the integrated management of watersheds is soil erosion and Sediment. The control of this problem requires precise studies; quantitative data to determine critical and prone to erosion areas. Thus, an analysis of rate of erosion and sediment production using GIS techniques and experimental methods, such as EPM and MPSIAC seems necessary. In this study, we tried to use these two models to determine the amount of sediment and erosion-prone areas in the two sub watersheds overlooking the city of Tehran; Kan and Darakeh to recognize where necessary for conservation operations. Finally with use geostatics operations, two models were compared. The results show the most values of erosion are in Tuffy, Shaly Parts of sub watersheds correlated with sensitive formation such as Karaj. Based on map of MPSIAC model more than 50% of the total sub watersheds area was classified at class high of erosion category with 373.78 m3∕km2 per year for Kan and 483 m3∕km2 per year for Darakeh sedimentation. Sub-basins’ erosion were calculated as 683.2 m3∕km2 per year for Kan and 792.5 m3∕km2 per year for Darakeh by EPM models. The results of statistical compare of erosion of MPSIAC and EPM models show that, there is no significant different between erosion estimate by MPSIAC model and real erosion measure, but the erosion estimate by EPM model have a significant different. Som MPSIAC model may have better performance.