Evaluation of DWB model and its correction for estimation of water balance components in Annual - watershed scale (Case study: Neishaboor and Rokh watershed)

The main purpose of this study is reform, development and evaluation of dynamic water balance model “DWB” with the approach of the proportional coefficients “To the kind of hydrological reality-based constraints” and acts the withdrawal of groundwater and surface water resources along with calibration and uncertainty analysis its parameter. The results showed that generally cannot obtain a set of optimal parameters for calibration SDDWB and DWB model and often the parameters of the models are low detection capability for model calibration in both study area (Neyshabur and Rokh watershed). The average total amount of surface water balance error DWB model for Neyshabur and Rokh watershed is Respectively -9.74 and -69.63 Cubic meters that is Represented poor performance model. there is a significant difference between Aquifer volume changes observed and simulated by DWB That the main reason is the lack beneficial effects of groundwater withdrawals in this model. Reviews performance results showed that the relative PRMSE index of the SDDWB model for both the study areas less than 10 percent, indicating acceptable accuracy SDDWB model. In general, the results indicate that the overall error rate of surface and groundwater discharge equation components using SDDWB model is much lower than the DWB model, which indicates the positive impact reform and development on the DWB model.