| Water resources are the basis of human survival and development,and irrigation area,as an important form of water resource utilization,are of vital importance for achieving efficient water resource utilization and promoting agricultural production.However,with the continuous development of society and the increasing population,the supply and demand of irrigation district water resources are becoming increasingly prominent,especially in typical irrigation areas like the Ganfu Plain,where water resources are more strained.At the same time,as the scarcity of water resources becomes more evident,ecological water demand has gradually become an important consideration in water resource management.Against this background,ensuring ecological water demand has become one of the important goals of optimizing irrigation district water resource allocation.Therefore,based on ecological water demand guarantee and the actual situation of irrigation district water resources,this study aims to propose an effective water resource management scheme by establishing an optimized water resource allocation model,achieving the organic combination of efficient water resource utilization,sustainable development of irrigation area,and environmental protection.The main contents and research results of this paper are as follows:(1)The present study analyzes the current situation of water resources supply and demand and the development and utilization of water resources in the research area.The results show that the Fuhe River,as the only source of water supply in the irrigation area,exhibits an alternating pattern of abundant and scarce flow,and the distribution of water throughout the year is uneven.The current water supply mainly serves the needs of domestic,industrial,agricultural,and ecological sectors,with agricultural water use dominating and water withdrawal concentrating from April to October,posing significant challenges to the water demands of agriculture and ecology during the dry season.(2)Under the guidance of the concept of ecological water demand,the ecological water demand in the irrigation area is divided into two categories:in-channel and out-channel ecological water demand.For in-channel ecological water demand,different calculation methods were compared and analyzed,and the Tennant method was ultimately selected to calculate the in-channel ecological water demand,which was determined to be 1.246 billion cubic meters per year.For out-channel ecological water demand,vegetation ecological water demand and urban environmental water demand were mainly considered.Effective rainfall and vegetation ecological water demand were determined based on GIS,and the out-channel ecological water demand was comprehensively determined based on the urban environmental water demand obtained through data analysis,with a result of101 million cubic meters per year.Combining the results of in-channel and out-channel ecological water demand calculation,the total ecological water demand in the irrigation area was finally determined to be 1.347 billion cubic meters per year.(3)Using the quota method and the trend method,the water demand of the economic sectors(residential,industrial,and agricultural)and ecology under each hydrological year type for the current year of 2020,as well as the near and distant planning years of 2025 and 2035,were predicted in the study area.According to the calculation results of the available water resources in the irrigation area,supply-demand balance analysis was conducted.The results showed that there was a water shortage in both the near and distant planning years under the drought year and extremely drought year situations,mainly concentrated in the low-water period of September and October.(4)A multi-user,multi-objective water resources optimization allocation model for the Ganfu Plain irrigation area,based on ecological water demand,was constructed,and solved using the particle swarm optimization algorithm.The results show that under strict water use indicators control,there are different degrees of water shortages in the planning years of 2025 and 2035,especially during drought and severe drought years,where agricultural irrigation water cannot be fully met.With limited water resources utilization space,optimal allocation of water resources was achieved,and ecological water demand was basically satisfied.By further improving the efficiency of agricultural irrigation water use,it is hoped that the future water resource shortage problem can be alleviated. |
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