Surface irrigation is known as the most widely used irrigation method. Proper estimation of Manning's coefficients and water infiltration parameters is one of the influential factors in surface irrigation systems. In this research, Manning's coefficients and infiltration parameters of Kastiakov and Kastiakov-Lewis equations were first eva‎luated in furrow and border irrigation using observational advance data. This was done through three methods of the volume balance with constant shape factors (VB-CC), the combination of volume balance and zero inertia models (VB-ZI) and the volume balance with variable shape factors (VB-VC). The results showed that the VB-CC method had the best calibration accuracy and precision according to the R2, NRMSE and MBE statistical indicators. Then, the VB-CC method as the superior method was added to the EDOSIM simulation-optimization model. The results showed that using the VB-CC method with using Kastiakov-Lewis equation instead of the two-point Elliott Walker method in the EDOSIM model increased the accuracy of simulation and optimization in border and furrow irrigation. Therefore, it is recommended to use VB-CC method in the EDOSIM model.

محمد شايان نژاد , محمود اكبري

محمد مهدي متين زاده , محمدرضا مصدقي