| With the rapid development of China's economy,the demand for water resources has become more and more dependent than before.Therefore,water resources have played an escort role in China's economic development.However,the amount of water resources in China is very tight,and the competition for water resources among water users is becoming more and more fierce.In order to alleviate the contradiction between water users and make the rational utilization and distribution of water resources,it is imperative to optimize the allocation of water resources.The traditional optimal allocation of water resources is mostly carried out from the perspective of life,production and ecology,and can not reflect the specific situation of a water user or a plot of land.At the same time,only reflecting the configuration results in numerical terms can not meet the requirements of today's water resources managers.Therefore,on the basis of previous studies,this paper studies the fine optimal allocation of water resources,constructs a fine optimal allocation model of water resources,and further explores the optimal allocation of water resources with multi-source,multi-user and multi-objective.At the same time,it emphasizes the spatialization,refinement and accuracy of the optimal allocation of water resources.The main research contents and results are as follows:(1)Research area gridding.The planting structure map and land use type map with the same resolution in the study area are selected and superimposed to determine the accuracy of grid results,that is,the size scale of each cell.According to the grid results of the study area,the application properties of each cell can be directly reflected.At the same time,the numbering of each cell has laid a solid foundation for the follow-up work.(2)Water demand gridding.According to the grid results,the attributes of each cell can be obtained.The quota method is used to predict the water demand of each cell,and then the water demand prediction results of the whole study area can be obtained.This result can reflect not only the overall water demand of the study area,but also the water demand of a cell,and predict the water demand from a more refined point of view.At the same time,according to the results of water demand grid,the water demand results can be reflected from the perspective of space,and the water demand prediction results are more three-dimensional on the basis of the numerical calculation of the traditional water demand prediction results.(3)Water supply grid.By determining the types of water supply sources in the study area and the supply range that can be achieved by various water supply sources,the types of water supply sources that can be accepted by a certain cell or a certain type of cell can be reflected.At the same time,the cells that can be supplied by a certain type of water supply source can also be determined,so as to complete the water supply network.(4)Construction and solution of refined optimal allocation of water resources.According to the grid results of water demand and water supply,the topological relationship between water demand of each cell and the corresponding water supply source and water supply is established,and the refined optimal allocation model of water resources is established.Through the attributes of each cell,the water supply priority of each cell is determined.Combined with the water use habits of the study area,the use priority of various water supply sources is determined.Under the control of objective function and constraints,particle swarm optimization algorithm is introduced to solve it,and the optimal solution of water supply and optimal water distribution scheme of each cell are obtained.At the same time,a fine software for optimal allocation of water resources is developed through Java computer language.(5)Case study.Taking Guantao County as an example,the refined optimal allocation of water resources is carried out.In the planning year 2025,there will be water shortage at different design assurance rates.Where,when p=50%,the total water demand of Guantao County is 127.9866 million m~3,the total water supply is 125.1389 million m~3,and the water shortage is 2.8477 million m~3;When p=75%,the total water demand of Guantao County is 169.641 million m~3,the total water supply is 127.5906 million m~3,and the water shortage is 42.0135 million m~3.Therefore,there is water shortage in Guantao County as a whole,and they are all on dry land.The optimal allocation of water resources is a long-term research problem.Most of the existing researches focus on the analysis of supply and demand between different water users and water sources.On the basis of previous studies,the research object is refined to each cell,focusing on the refined water resource allocation of a specific region and specific users.The above research results will contribute to the water resources management of Guantao County in the future and provide theoretical support for it. |
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