Assessment of Erodibility and Desedimentation in Pileh Rood Watershed in "Ardabil" with Fuzzy Technique

In the end of the eastern side of Azerbaijan volcanic plateau, in the altitudes of Sabalan and Baghrodagh, there is a relatively closed structural depression and pit called Ardabil plain that all surrounding altitudes are directed toward it.Different structure with various resistance rates, enjoying cold semidried climate, the lack of vegetation coverage, and the dominant negative trends on a extensive part of mountain plain of the areas have caused these areas especially the naturally formed watersheds in them to have a relatively high Erosibility power.The main purpose of present study is the evaluation of erosion and erosion desedimentation in Pileh Rood watershed as one of sub _basins of folding altitudes of Namin located in northern side of Ardabil.In this study, in addition to aerial photography at the scale of 1: 55,000, topographic maps scale of 1: 50,000 and geology map 1:100000 filed erosion and sedimentation are measured by logic fuzzy method. Finally, this technique was compared with empirical method of P.S.I.A.C and the given erosion limits was evaluated and compared through observations and field work.Using fuzzy modeling with minimum input data by the two -variable model and comparing it with P.S.I.A.C model it was concluded that the fuzzy logic - soil erosion prediction models are efficient at locating and differentiating areas of soil erosion with minimum input data.