شبیه‌سازی جریان روزانه حوزه آبخیز نکارود با استفاده از مدل پیوسته محاسبه رطوبت خاک

Application of continuous hydrological models and its calibration methods development using geographic information systems are increasingly expand. The purpose of this study is calibration and validation of SMA model and simulation of continuously river flow in Neka basin. In this study, firstly the temperature and precipitation variables prepared for the model and then SMA parameters were calculated for different period of calibration. The parameter estimates needed analyzed in GIS for the different period and finally validation and its accuracy was estimated. Generated hydrograph from the scenarios set of model parameters was compared in Gelvard observation station. Annual calibration and validation results showed that the observed and simulated correlation coefficient was 0.80 and 0.75, respectively. Also, for the validation period the objective function of AEPM (10.17) had a better matching than the calibration period (18.26). By simulating the flow river using climatic events which continuously over a long period of time, the daily discharge is obtained and showed the satisfactory results. Using this model for estimating of stream flow, the study of climate change, changes in land use and therefore better management of water resources is possible.