Evaluation of Soil Erosion and Sediment Yield Using MPSIAC Model and Application GIS in Eshghabad-Sule Watershed (SW of Quchan)

Soil Erosion and Sediment Yield is one of the main environmental problems in watersheds of Iran. The purpose of this study is using MPSIAC model and application of GIS to minimize the probable errors in soil erosion evaluation and sediment yield in Eshghabad-Sule watershed. This area is located in the southwest of Quchan, and it has 81.365 km2 area and elongate form. This basin is located in Binaloud structural zone, and it has relatively thick sequence of volcanic and sedimentary rocks. Data layers of MPSIAC model are comprised of nine effective factors in erosion and sediment yield in the watershed that were obtained by digitalizing and classifying the basic information data in GIS program. The final erosion map was obtained from all information layers. The results of MPSIAC model indicated that 46.79% (3807.1751hec) was classified at IV class with high sedimentation and 53.2% (4329.3249 hec) was classified at class III of erosion category with medium sedimentation. Mean sediment yield was calculated as 5.04 and 2.844 ton/hec by MPSIAC model, respectively. The comparison of mean sediment in this watershed with mean data from the nearest hydrometery station is get acceptable results.