Performance Valuation Fuzzy Model and Variable Infiltration Capacity (VIC)Model in Estimation of Meteorological and Hydrological Variables (Case Study:Neyshabour Basin)

The purpose of this study is to use a semi-distributed VIC model to estimate monthly runoff, actual evapotranspiration and soil moisture in the Neyshabour basin for the period of 1985 to 2014. Results of sensitivity analysis showed that in the mechanism of simulating runoff, the VIC model is more sensitive to infiltration capacity parameter and second soil layer. First, the VIC model was calibrated using a simulated runoff data comparison with the basin outlet for the years 1995-1993. The results indicate the high performance of the model in simulating the flow of the basin outlet. So that the values of R2 and NSE were 0.85 and 0.99, respectively. Also, the VIC model was verified with runoff data of Hossein Abad Jangal station and simulated evapotranspiration with SWAT and SEBAL algorithm. Values of R2 and NSE for runoff were 0.8 and 0.9. The results indicate that the simulated VIC model is more compatible with SWAT model data, and the values of R2 and NSE are 0.76 and 0.7, respectively. According to the obtained results, the VIC model can be used to simulate the variables required in water resources and meteorological studies.