Simulation And Optimization Of Agricultural Water Resources System Based On Conversion Of Electricity To Water

The shortage of water resources and water pollution has become a global problem.In Xuanhua District,the main grain producing area in Northwest Hebei Province,in recent years,the water quality of rivers in Xuanhua district has been deteriorating due to the direct discharge of production and domestic sewage.Aiming at the problems of water shortage and water quality pollution caused by rapid development of agriculture and unreasonable utilization of water resources in Xuanhua area,it is of great significance to carry out the research on the optimal allocation of agricultural water resources for the coordinated and sustainable development of regional water resources and economy.this paper uses SD-MOP method to simulate the development trend of agricultural water resources system,optimize the supply and utilization structure of agricultural water resources,and seek the optimum allocation scheme of agricultural water resources,the main research results of this paper are as follows:(1)The system dynamics method is used to analyze the feedback relationship among the elements of agricultural water resources system,and the system dynamics model based on the allocation of agricultural water resources is constructed.In order to solve the problem of selecting system elements by subjective qualitative analysis in the past,this paper first summarizes the influencing factors in the process of agricultural water resources allocation,and then analyzes the correlation between the factors based on Spearman rank correlation analysis,so as to quantitatively analyze the importance of the influencing factors and improve the scientificity of agricultural water resources allocation decision.Finally,the validity of the historical test is verified to further predict the development trend of agricultural water resources system in Xuanhua district.(2)Combined with the sensitive factors of SD model,the decision variables are determined,and the optimal allocation model of agricultural water resources is constructed.Takes the maximum agricultural output value as the economic goal,takes the minimum COD concentration of Yanghe River as the ecological goal,At the same time,considering the lack of agricultural water resources,taking the minimum total irrigation water as the goal,introduces the method of " Conversion of Electricity to Water" to transform the irrigation water into observable and measurable electricity consumption,to build a multi-objective programming model based on the allocation of agricultural water resources.Based on the pre decision search to solve the multi-objective model,NSGA II algorithm is used to solve the Pareto solution set,and a combined weighting optimization model is established to calculate the weight of each objective,and the comprehensive evaluation value is calculated to determine the optimal solution.(3)Simulation and optimization of agricultural water resources system in Xuanhua District.Compared with the results,the total agricultural output value of Xuanhua district increased by 2.07%,COD concentration of Yanghe River increased by 0.09%and agricultural power consumption decreased by 21.23%in 2016.The optimization scheme improves the agricultural economic benefits,saves the agricultural power consumption and reduces the agricultural water consumption,alleviates the contradiction between supply and demand of regional water resources.Then,the optimal allocation of agricultural water resources in target year 2020 is carried out,and the coordinated development plan of agricultural water resources and agricultural economy in Xuanhua district is proposed.