Optimizing water resources allocation to agricultural use with Fuzzy Data Envelopment Analysis (FDEA) and Genetic algorithms (case study: Varamin)
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Optimizing water resources allocation to agricultural use with Fuzzy Data Envelopment Analysis (FDEA) and Genetic algorithms (case study: Varamin) abstract
The restriction on the available water resources and on the other hand the 90% consumption of the available water resources for irrigation in agriculture, has introduced water as an economic and valuable good.
The purpose of this study is to suggest a strategy to optimize the water consumption in the agricultural sector of Varamin field through applying water efficiency in the agricultural products.
In order to accomplish the above objectives, efficiency measuring methods including: FDEA and NSGA-II have been used to compare the results of these two methods.
The results of FDEA model shows that the Corn with efficiency value of 1.54 Ranked first in terms of water productivity, risk and profits for farmers. The watermelon also with the efficiency value of 0.46 ranked last and considering the high consumption of water for one unit of product compared to the others, and high cultivation with relatively high risk and low profit, was diagnosed inefficient.
With the implementation of linear optimization model which done in Lingo 11, Two approaches to the problem have adopted.one is minimizing the water consumption in the area with reduction of risk when the amount of gained profit doesn’t not be less than current state and the other is Maximizing the total area profit with current risk water consumption situation. In the first scenario the results show the optimization of water consumption up to 22 percent of the current state.
In the second scenario the results showed that it is possible to increase the total profit up to 24 percent with the current state of water consumption for annual cultivation.
Water consumption optimization through NSGA-II genetic algorithms was also associated with significant results so that the saving in water consumption was 23.5 percent and, the risk was 20 percent lower than it’s current state and also the profit raised 2 percent. Comparing the results of the models, it can be said that both methods have acquired almost similar combinations of cultivated crops. However, coding and implementation of linear programming is easier than genetic algorithm and also faster in reaching to the target. There is also possible to do sensitivity analysis of output results and the opportunity cost is computable. On the other hand, the genetic algorithm, regarding the generation of Pareto boundary, make many choices, as optimal level available to us. According to the requirements and objectives of the program, each of these choices could be optimal function.
At last, the spatial allocation optimization of the cultivation Composition (Crop pattern) obtained by MOLA method
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Optimizing water resources allocation to agricultural use with Fuzzy Data Envelopment Analysis (FDEA) and Genetic algorithms (case study: Varamin) Keywords:
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