The Primary Study On The Optimum Model Of Water-Saving Irrigation Management In Hetao Irrigation District, Inner Mongolia

Facing to the reduction of the water diversion from the Yellow River for Hetao irrigation district Inner Mongolia Autonomy,and giving attentin to agriculture production and improvement of salinization,this paper researches optimization model of district water-saving irrigation water management.The paper also quests for the optimization model of crop irrigation system and the optimization irrigation strategy aiming at the short of water for agriculture.In order to save water and use water high efficiently,this paper researches the change regulation of irrigation system of spring-wheat that is the important crop in the irrigation districted establishes the multidimensional dynamic model of irrigation rules of spring-wheat.lt also makes the simulation model of salt leaching of fall irrigation rules during non-growing period,and sorts the elements influencing water-saving of irrigation system. Above results all use the theory and knowledge of system analysis,drainage and water-saving irrigation.(l)On the basis of spring-wheat requiring-water regulation,referring to deficient irrigation experiment data of spring-wheat,and using dynamic programming theory,this thesis develops the optimization model of spring-wheat irrigation system.The aim of model is to reduce the irrigation quota during growing-period. The model reflects the influence for crop output due to reducting of irrigation water on the condition of water-saving. At the same time,using the results of model ,the paper provides the optimization irrigation quota and the aim of high yield and high benefit based on the principle that the net benefit of unit water is highestUsing the model ,we can reasonably distribute the irrigation water for spring-wheat during growing period on the condition of different irrigation quota. Through evaluating the comparative yield by the model,the paper gains that the reduction of spring-wheat output is biggest when the irrigation quote is between 100 and 200.The thesis also gains that the corresponding economic irrigation quota is 170-120m3/667m2.Above results can provide scientific reference for irrigation water optimization distribution for crops in the individual irrigation area and the programming of irrigation district.(2)Aiming at the bigger irrigation quota of fall irrigation system and the complicacy of the salt movement in soil,the paper applies reservoir leaching model bring forwarded by W.H.Van Der Molen to Hetao irrigation district located in aridity area ,and establishes salt leaching simulational model under the fall irrigation system.Through calculating ,the feasible fall irrigation quota is 100-120m2/667m2 in light salinization soil,and the feasiblefall irrigation quota is 120-150 m2/667m2 in mild salinization soil.The model is reasonable and exact ,and it can be researched deep.(3)The paper sort the influencing elements and parameters according to the importande using of hierarchy process;leaching.It also gets genera sort of biggest target of agricultural and ecological benefit according to comparative importance. ,This paper verifies the sensitivity of program, and extends the apply scopes of hierarchy analysis method,at the same time, it can provid definit technology support and reference for establishing distrubiting pattern optimization modle of bid system in HeTao Irrigation District for the future.The paper quests for several unfathomed problems in water-saving irrigation water managementand establishes the corresponding optimization model.The optimization model of water- saving irrigation water management gained from the paper can provide basis for management of agriculture water in the areas that is short of water,and it also can provide reference for similar area in the north.