A New Mathematical Model for Optimal Design of Border Irrigation Based on Sensitivity Analysis of Weighting Coefficients of Indicators

As pressurized irrigation is not possible for all circumstances، the use of modern techniques in surface irrigation is essential. In this paper، BISEDOM، a new mathematical model for evaluation، design and optimization of border irrigation is introduced. The effects of weighting coefficients of indicators are investigated based on the potential to improve and the most appropriate weighting scheme in optimization process is presented. In this model، volume balance equations for hydrodynamic simulation and SA method for optimization steps are used. Due to the nature of the SA، its parameters are determined by the method of sensitivity analysis. In this model، evaluation of different combinations of decision variables (inlet flow، length، width and slope of the strip) and consequently the performance of irrigation efficiencies reagent strip in an objective function is possible. Finally، the results indicate that the proposed method for weighted indicators has significant effects on improving performance of border irrigation. Model validation results in three parts of design، evaluation and optimization in comparison with SIRMOD and asymptote method showed that the results are very close to each other. The results also indicate that the proposed model has a good efficiency in comparison with other existing models especially for optimization purposes.