Simulated optimization of reservoir operations of the Zayandehrud dam, Iran

Due to severe droughts in the Isfahan province of Iran and limited water resources (arid and semi-arid climate), managing optimum operation of these resources is important. The two parts of this study are the use of HEC-ResSim to carry out a simulation phase and the optimal operation phase by using LINGO model for single-objective optimization. The objective function of the optimization model is maximizing the total release for various demands downstream of the dam. The operation of the reservoir-river system should be based on practical guidelines for the storage or release of water to meet the project demands. The rule curve and optimal operation policies of the Zayandehrud dam can be explained by average regulatory output of the dam per month during the period covered (1957-2003). iii Another important step in the optimization model is evaluation of reservoir operation policy performance. Evaluation indexes are very applicable to achieve this goal. One of the most important index is the reliability index. The reliability index was considered to compare the dam operation based on the prepared policies (rule curve) with standard operation policies (SOP) and downstream demands. Results indicate that the optimized operation of the Zayandehrud dam will increase the storage of reservoir by 88.9%, increase the times when the reservoir is full by 5.2% and reduce the times when the reservoir is empty by 18.6%. Although, the optimization of the Zayandehrud reservoir operation resulted in a 3.1% reduction of the total supply, it has however realized a 10.8% increase in the reliability index of regulatory water for all the requirements. The result of the simulation analysis shows that the volume of reservoir storage during the 47-yr period is 636.1 and 336.8 million cubic meters during optimization and standard operation (non-optimization), respectively. Results indicate that under optimal conditions 33 months (5.9%) and that under standard operating conditions (non-optimal) only 4 months (0.7%) the reservoir would be filled over the period. Also during optimal conditions 76 months (13.5%) and non-optimal conditions 181 months (32.1%) respectively the reservoir would be empty over the period. The results reveal an increase of 88.9% of reservoir storage volume under optimized operation condition.

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