Quantitative measurement of runoff erosion potential on slopes of mountainous areas(Case study :Atash Beig Sub basin)(Case study :Atash Beig Sub basin)

Runoff is carving slope surfaces in first time and intensive conditions its is making disturbance surfaces slope .Investigation on runoff property on slopes and influence factors on its property is make possible protective actions slopes. With using the results can be measure of sediment yield rate and is acting protective slopes .Surfaces of slopes is disturbance by runoff(located on eastern slopes of Sahan mt. and is situated 37 00 to 37 20 N and from 46 45 to 47 15 E) ) channel. Investigation on liner erosion must be make about runoff property .In this article is used experimental equations for study on runoff property(by ,V1,Tc,Tr,...).The results of these study show that runoff have very vary velocity on all parts of catchment .In final step is estimated liner erosion(by CIT index)and then mapping rate of yield sediment .The results is suggested that CIT is over 5 in some parts of catchment . This result show that runoff have power for intensive carving on slopes. The carving power of runoff is high at middle parts of catchment .