Document Type : Research Paper

Authors

• Habib Nazarnejad ¹
• Seyed Dana Hesami ²
• Mahdi Erfanian ²
• hirad abghari ³
• Mohammad Ali Mahmoodi ⁴
• Mohammad Rostami Khalaj ⁵

¹ Gorgan University

² Faculty of Natural Resources, Urmia University

³ Urmia University

⁴ University of Kurdistan

⁵ Agricultural Education and Promotion Research Organization, Mashhad,

Abstract

in line with the integrated management of watersheds using the obtained quantitative data. In this regard, in recent years, various relationships and models have been presented. In this research, in order to evaluate the rate of watershed erosion, the three-dimensional universal soil loess erosion equation and the GIS and remote sensing have been used. , in this research, the results of RUSLE 3D model have been compared with the results of RUSLE model and real values. The rain erosion factor was calculated using rainfall data and interpolation techniques. Soil erodibility was obtained using regional soil map and American soil classification. The land cover factor was calculated using the Normalized Difference Vegetation Index (NDVI). The elevation factor was obtained using digital elevation model. The main difference between the RUSLE 3D model and the RUSLE model is the difference in how to calculate the length-slope factor (LS) in the universal soil erosion equation. The obtained results showed that the annual average erosion is 5.02 t/ha/year.In the detailed studies of Gaushan watershed, the rate of erosion is 4.5 ton/ha/y. These results show that the RUSLE 3D in which the (LS) has been modified, has been able to estimate the basin erosion well.

Keywords

• RUSLE 3D
• Geographic Information System
• Remote Sensing
• Guahan watershed

Main Subjects

• Physics and soil conservation