Study On Optimal Allocation Of Agricultural Water Resources In Liuyang City

With the continuous growth of population and the accelerated development of urbanization,urban and industrial water use has increased sharply,and water shortages caused by factors such as water pollution and the contradiction between water supply and demand have become increasingly prominent.Liuyang City has developed agriculture,which agricultural water accounts for about 60%of the total water resources.Liuyang City is generally abundant in water resources.However,due to the uneven distribution of water resources during the year and in the region,with the coincidence of the dry season and the agricultural water demand period,the efficiency of agricultural water resources utilization is low,which intensifies the conflict between regional water supply and demand.Therefore,optimizing the allocation of agricultural water resources in Liuyang City will help promote the sustainable economic and social development of Liuyang City by improving the utilization efficiency of agricultural water resources.To optimize the allocation of agricultural water resources,the research case of intelligent algorithms provides new ideas for solving problems.Based on the analysis and summary of the research status of domestic and foreign agricultural water resources optimal allocation,Liuyang City,Hunan Province is used as the research area to analyze the status quo of water resources utilization,summarizing the existing problems in the utilization of water resources.The five agricultural crops,namely rice,corn,rapeseed,flue-cured tobacco,and vegetables in Liuyang City,are selected as the research objects.The research objectives are to maximize the economic benefits of agricultural production.Under the three-level scenarios of abundance,flatness,and dryness,the optimal allocation model of agricultural water resources and crop planting area under different inflow guarantee rates is constructed,which the adaptive mutation particle swarm optimization algorithm is used to solve the optimal allocation model of agricultural water resources to obtain different inflow guarantee rates.The optimized result of agricultural irrigation water volume and crop planting area under the following conditions.Compared with the improved particle swarm optimization algorithm and the unimproved particle swarm optimization model.The main research conclusions of this paper are as follows:(1)From 2010 to 2018,Liuyang's gross water demand for irrigation continued to be in a water shortage situation.In 2018,the gross water demand for irrigation was the largest,reaching 246.4 million m~3,accounting for 61.31%of the agricultural water supply.In 2010,the gross water demand was short,the degree of which is the smallest,with a water shortage of 130.1 million m~3,accounting for 25.78%of the agricultural water supply.It can be seen that the problem of agricultural water shortage in Liuyang City is obvious.(2)Under the three-level scenarios of abundance,flatness,and dryness,the optimization results show that,on the one hand,the amount of irrigation water for vegetables is appropriately reduced,and the amount of irrigation water is allocated to flue-cured tobacco,rapeseed and other crops.On the other hand,due to the high economic benefits of vegetables,a reasonable increase in vegetable planting area,reduction of rape and corn planting area,and adjustment of the planting structure among various crops will help promote the economic benefits of agricultural production in Liuyang.(3)Compared with the unimproved particle swarm algorithm,the improved particle swarm algorithm has stronger optimization ability,and the algorithm has stronger stability,faster optimization speed,and reasonable and reliable results of the algorithm.In short,optimizing the allocation of agricultural water resources in Liuyang City can effectively improve the utilization efficiency of agricultural water resources,alleviating the pressure on agricultural water use in Liuyang City,and also promoting the growth of economic benefits of agricultural production in Liuyang City.The research results have certain guiding significance for guiding local agricultural development.