Research Of Water Resources Management In Irrigation Areas By Taking Into Account The Eco-friendly

Well-canal Combined Irrigation, which required the joint operation of surface-water andground-water and considered the water ecological problem, is the main irrigation mode in the most ofirrigation areas of North China. With the different characteristics of water resources, surface-water andground-water can be transformed into each other, and these characteristics determine the difficulty ofhigh efficient utilization of water resources in irrigation areas. The deeply studies have been taken onthe joint operation of water resources in irrigation areas. Thorough studying different scales of waterresources and the combination of software and hardware, a completive and comprehensive system oftheory and technology of the joint operation of water resources have been established in irrigation areas,which have very significant meaning of the theory and application of water resources operation inwell-canal combined irrigation areas of North China. The main content and results of this paper are asfollows:(1) Raising the concept of credibility operation of water resources in irrigationAiming at the well-canal combined irrigation mode in the most of irrigation areas of North China,applying the theory and concept of credibility in the field of computer science, the concept of credibilityoperation of water resources in irrigation has been raised. According to the principles such as thecombination of macroscopic and microscopic aspects, the issues of water resources research underdifferent scales have been discussed in irrigation areas and the research results promote the furtherimprovement and development of the theory of joint operation of water resources.(2)Research on the influence of global-scale irrigation on the wheat yieldWith30arc of spatial resolution in global scale, this paper uses GEPIC model to estimate theeffects produced by global-scale irrigation over the increase of crop yields. According to drought anddifferent irrigation depth with100,200,300,400mm/yr, high-resolution images of wheat yields havebeen made and the results show the dependent of the magnitude of wheat yields on the irrigation indifferent areas over the world, which provides reliable basis for water conservancy policy-makingdepartments using the information in a wide range of areas to make policy about water and food.(3) R(3)Preliminary research on water ecological degradation mechanism and diagnosis inirrigation areas scaleAccording to the hydrological cycle characteristics of the yellow river irrigation areas, the indexsystem has been designed on the basis of studying the structure and function of typical irrigation areasecosystem, which presents the condition of the water ecological health that includes hydrologicalcharacteristics, water environment situation, sediment condition, salinization condition and so on.Several significant water ecological issues such as hydrological situation and salinization developmentin yellow river irrigation areas are emphatically analyses. Pearson correlation analysis was used whenresearch on degradation mechanism of ecological system in irrigation areas.(4)Research on the joint operation of surface-water and ground-water with relevant software development in irrigation areasAimed at the multileveled water distribution, the methods of gradually decomposition andcoordination are used in this paper to dispatch the irrigation water resources according to the waterdistribution from up to down and the optimization from down to up, through which, the appropriateirrigation patterns and systems for the main crops in irrigation areas are obtained. In order to settle theproblem of the joint operation of surface-water and ground-water, the main line of regulationgroundwater level has been established on the basis of the operational characteristics and basic situationof the People's Victory Canal Irrigation Area. The distributed man-machine interaction intelligentmonitoring system with the multi-water joint operation has been developed, which combined thefunctions of information collection, data analysis, optimal operation and visual operation.(5)Fuzzy comprehensive evaluation of water resources carrying capacity and groundwateroptimizationTake the People's Victory Canal Irrigation Area and the Baoji Irrigation Area for example, themodel of multi-level fuzzy comprehensive evaluation has been established to evaluate water resourcescarrying capacity in large scale irrigation areas. Water resources carrying capacity has been analysesfrom the field dimension, time dimension and interval dimension. The process of the seepage ofirrigation water from soil water to groundwater and the corresponding mathematical model have beenmade, the soil water deep leaching has been researched, the optimum model of groundwatermanagement has been established so as to optimize groundwater.(6)Research on the methods and efficiency of removal non-point source pollution of recession flowwith artificial wetland in irrigation areasOn the basis of experiment, the research has been made in the general purification efficiency ofartificial wetland system, the purification efficiency with advanced treatment of subsurface flowwetland and the removal effect of siphon experiment with enlargement discharge. Results shows thatusing artificial wetland has a better effect on purification of non-point source pollution, and it can beused in broad application.