Tempural Evaluation of Water Erosion with CORINE Model

Geographical information systems (GIS) -based soil erosion risk assessment models continue to play na important role in soil conservation planning. In the present study، soil erosion risk of Tange Bostanak watershed was determined within GIS-based Coordination of Infromation on the Enviroment (CORINE) soil erosion risk assesement method. Inittially soil texture، soil depth and surface stoniness maps were created and were intersected in GIS enviroment in order to generating erodibility map. Then، Fourinier preciptation and Bagnouls- Gaussen drought indicces determined based on metero-logical data nad erosivity were calculated. The composed erodibility map was co-evaluated within erosivity value and solpe map of the site for composing potential eroxion risk map. At the final step، the previous yearly land use maps which belong to years 1988، and risk alternation were assessed. In conclusion، according to our results in Tange Bostanak watershed in 1988 there have been low، medium، and high erosion risk values have changed. In 2007 there have been low، medium، and high erosion risks at 0. 82، 93. 99، and 5. 18 respectively، whereas in 2007 there have been low، medium، and high erosion risks at rates rates0. 15، 89. 99، and 9. 84%، respectively values have changed. i. Inter yeat comparison al of ternation to increase advantage of the medium and high erosion.