comparison of sand drifts potential stimating, using momentum method and fryberger velocity classes method ( case study: jask and kerman)

abstract in this research sand drifts potential using sand rose graph software and fryberger velocity classes’ method investigated. thus wind data between 1985 and 2005 from meteorological stations of jask and kerman were analyzed to examine sand drift potential. sand drift potential amount of kerman station was 412.6 using sand rose graph and 401.09 using fryberger,s method. sand drift potential amount of kerman station using sand rose graph and fryberger,s method was 979.2 and 490.51 (v.u) respectively. the calculated values of sand drift potential by two methods showed that there is a little difference between two methods while about kerman station the calculated values with software is more than fryberger, s method because this method do not account the speed more than 40 knot .also, the velocity values has been considered normal in fryberger,s method while velocity values in one class are not normal, and we can't attribute one number to whole of velocities in each class.