Analysis of Impact of land Use on Simulation Results of Basin Hydrological Parameters Nirchay watershed by using SWAT model
2020
sayyad asghari sararskanroud | Mehdi Faal Naziri
Impact of land use on hydrological processes and runoff of watershed can help manage water resources challenges and proper planning in watershed management. Hydrological models are a simplified representation of a real hydrological system that studies the basin's performance, so selecting a model requires identifying the capability and limitation of basin hydrology models. In this study, Landsat satellite imagery (OLI-TM) for years (1990-2000-2018) was used to investigate the impact of land use on runoff in the Nai Chai River Basin. Initially, the relevant images were obtained and preprocesses were applied, then the classification was done using the object-oriented method and the nearest-neighbor algorithm. Validation was used for sensitivity analysis, calibration. According to the coefficients NS, R2, P and R obtained at the calibration stage (0.74, 0.75, 0.88, 0.82, respectively), and at the validation stage (0.68 , 0.68, 0.72, 0.90, 0.79) respectively, indicate that these statistics have an acceptable performance in predicting the variables under study in the watershed. Therefore, the results of this study showed that the SWAT model has the best performance from runoff simulation in the Ney Chai river basin compared to observational data during the validation period.
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