Study On Optimization Of Canal System Water Transportation And Distribution In Fu Yu Irrigation Area Based On Genetic Algorithm

As the most important limiting factor for the development of irrigated agriculture,water resource directly determines the size of irrigated area,the economic benefits of crops and the development of regional agriculture.According to statistics from the ministry of water resources in2018,China’s total agricultural water consumption accounted for 61.4 percent of the total,and more than 90 percent of the country’s agricultural water was used for irrigation in irrigated areas.For the problem of water shortage in agriculture,how to reduce the loss of water resources and improve the utilization efficiency of water resources in irrigated areas has become an important topic of current research.The channel of irrigated area bears the functions of water conveyance and water distribution in the canal system of irrigated area.Therefore,based on the rich irrigation area in heilongjiang province all levels of the channel as the research object,will take the elite strategy non dominated sorting genetic algorithm(GA)is applied to backbone of canal operation optimization study,the rich irrigation canal system water flow rate and water delivery time and gates open system research on the problems such as the height,in order to realize modernization of agricultural water-saving irrigation area,irrigation management to provide theoretical basis and technical support.The research contents and results show that:(1)Paper based on the basic situation in the irrigation area,channel water loss minimum for the first goal,with the backbone for the second target of minimizing the main canal water fluctuation in irrigation water,water flow,irrigation time as constraint,using non dominated sorting genetic algorithm with elitist strategy optimization,solving the backbone of the channel and then with water flow and water flow time and flow corresponding gate opening.Results showed that:1)the first branch canal irrigation district in transplant root and tillering,booting,heading and flowering stages of jointing stage and water delivery time is 2～11 days respectively,9～31 days,2～15 days,6～18 days,while second branch canal in each phase of the water delivery time is 1～12 days,9～35 days,2～18 days and 3～18 days,main canal water start time is according to the lower lateral canal the minimum and maximum values for the selection.Compared with the previous water transmission plan,the optimized results reduced the water transmission time,realized short-term centralized water transmission,reduced the water loss of434,800 m~3,improved the utilization efficiency of irrigation water,and verified the rationality of the optimized water distribution plan,which was used as the basis for scientific water distribu tion in the irrigation area;2)irrigation canal system bleeder optimization to solve the gate opening,and as a basis for the water control valve to open each period,guarantee the bleeder level remained stable,and the lower channel regulation of water within the prescribed period of time,improve the irrigation canal system water delivery accuracy,guarantee the bleeder level remained stable,and the lower channel within the prescribed period of time regulation of water.(2)In this paper,the minimum difference of continuous water diversion time between the rotation irrigation groups was taken as the optimization objective to divide the rotation irrigation group,and the water distribution time of the rotation irrigation group and the water distribution time of each channel in the rotation irrigation group were solved by taking the rotation irrigation period,the lateral canal irrigation state and the water delivery flow of the superior channel as the constraint conditions.Results show that the group according to the rotation irrigation in the irrigation area partition model in comprehensive consideration to the lateral canal with water flow and of location factors such as cases,2 lateral canal subordinate channels can be divided into two group to fill,after optimized,two group rotation irrigation in crop transplant root,tillering and booting and earing flowering elongating stage four stages of irrigation time can satisfy the requirements of wheel period and sustained water diversion time close to,ir rigation time were 0.18h,0.45 h,0.28h,0.25 h.The water diversion flow of the rotation irrigation group at each growth stage meets the flow requirements of the superior channel,and the average water diversion flow of the rotation irrigation group at each growth stage is relatively uniform,which is convenient for the implementation of the irrigation area management project.