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The Portion of the Influent Parameters on Adaptation Length in Sediment Transport in Numerical Models Original Article, B36 Fuladipanah M,Majediasl M. Journal. Civil Eng. Urban. 2(6): 202-206. 2012. ABSTRACT:River flow and sediment transportation are two phenomena, which are taken place in alluvial streams. The complexity of the simulation of this phenomena have been caused numerous numerical models which are consists of different parameters. The un-equilibrium nature of sediment transport has been caused using un-equilibrium predictor. Adaptation length is one of the most important parameters in this type of equations, which is function of four parameters: flow depth, flow velocity, adaptation coefficient, and sediment fall velocity. Determining of sensitivity level of four mentioned parameters is discussed in this paper. The FAST technique, which is variance based sensitivity method, was applied in this research. According to the results, the first order FAST based sensitivity indices, explain 81.42% of the total variance, i.e., the result of this technique is acceptable. Results showed that sediment fall velocity has the most parameter, which must be measured with high accuracy. In addition, it was found that sediment particle properties are more effective than flow properties. Keywords:River, Sediment, Adaptation length, numerical models, sensitivity analysis. منبع: [Hidden Content] دانلود: [Hidden Content],%20B%2036%20202-206.pdf JCEU, B 36 202-206.pdf