The process of rainfall – runoff is a physical phenomenon which its survey is difficult due to susceptibility by various parametrs. Optimum exploitation of water resourses is one of the most important duties of water resourses managers. In other hand, improper estimation of runoff in basins cause to some problems in optimum management of water resourses and reservoir dams. Therefore, simulation of rainfall – runoff is a proper solution for runoff estimation. So far, a lot of models and different ways for estimation and simulation of rainfall –runoff are presented that rivers flow intensity is predicted by them. The aim of this study is the comparison of different methods results of runoff loss evalution(Initial and constant, Green & Ampt, SCS curve number with regard to various purpose functions (percent error in peak, peak-weighted root mean square) in HEC-HMS model and classifying them. Based on each objective function, the method that approximately in 70% events, had the least peak flow changes will place in first preference as the best method for runoff simulation and other methods placed in next preferences. Finally, result showed that for two objective functions, Green & Ampt, SCS and Initial and constant method placed in first to three preferences, respectively. So, Green & Ampt method suggested for using in similar area and conditions.
کلید واژگان :Curve Number, Green & Ampt, HEC-HMS model, Initial loss, precipitation loss
ارزش ریالی : 600000 ریال
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