Study and qualitative of estimation erosion on geomorphologic outcropsusing FAo method Navroud drainage basin

Watershed basins of Iran are very different with a view to geology, unevenness, climate andthe other factors effective in erosion. The aim of this research is study of different types oferosion in Navroud watershed basin, investigation of the intensity of erosion, sedimentproduction and the factors effective in this relation. The physiological, topographic, climatic,geological and geomorphological specifications, plant covering, soil, erosion and sedimentproduction were generally studied. The area of the basin is about 265.46 square kilometers.Then with integration of the original work units and their petrological structure. The intensityof erosion and sediment production in each work unit was investigated with use of(qualtitative) FAO (experimental method). On the basis of the obtained results subbasins Nos.Also they have the most amount of sediment production as compared with the othersubbasins. Some of the reasons include the great slope, change of application, ruining offorests and pastures, construction of roads and existence of the formations sensitive toerosion. The other subbasins have the least amount of erosion and sedimentation, becausetheir formation is resistant to erosion and generally includes biotite, sandy lime, tuff andandesite. Generally the results of this research show that in each work unit, slop is the mostimportant factor of erosion and this is true in some of the outcrops. The most considerablefactors for occurrence of erosion in a basin include application change, forests and pasturesruining, road construction and very great slope.