| Jingdian Phase I Irrigation District is taken as the research object in this paper.We regard the cascade pump station as a system,based on the analysis of the relationship between the basic elements of the system and its external environment,aiming at water saving,energy saving,efficiency enhancement and environmental protection,research on water-energy spatial-temporal pattern optimization and green development strategy in the cascade pump station irrigation district.It provides a scientific basis for the optimal allocation of water,energy and investment resources in the irrigation district and its sustainable development.This article has achieved the following innovative results:(1)Analysis and evaluation of current water-energy spatial-temporal pattern in the irrigation district.The topological relation between the layout of pump stations,open channels and pipelines and the basic elements of the cascade pump station irrigation system is clarified.The calculation model of gross irrigation quota and annual energy consumption per unit area is established.The quantitative relationship between the spatial pattern of irrigation technology and crop area and the spatial-temporal pattern of water-energy in each sub-district of the irrigation district is revealed.The calculated annual gross irrigation water volume and annual energy consumption of the current irrigation area are 15588×104m3 and 18834×104 kWh,which is consistent with the actual value,verifying the rationality of the relevant water energy spatial pattern calculation model and model parameter values.The current water-energy spatial pattern in the irrigation district is evaluated.The development direction of irrigation district is clarified.The calculation model of water-energy time distribution pattern in the irrigation district is constructed.The current water-energy time pattern and its distribution characteristics are calculated and analyzed in the irrigation district.(2)Spatial-temporal pattern reconstruction and scheme screening of water-energy in the irrigation district.From the aspects of environmental protection and economy,the principle of spatial-temporal pattern reconstruction of water-energy in the irrigation district is proposed.The spatial-temporal pattern of water-energy in the cascade pump station irrigation district is revealed,which is related to three-dimensional area variables of sub-district,crop and irrigation technology.Combining three dimensional variables to form 7 different types of spatial-temporal pattern reconstruction schemes of water-energy in the irrigation district.According to the comparison and selection indexes of the constructed schemes,the reconstruction scheme 7 is selected.The investment,annual gross irrigation water,annual energy consumption and crop output value of scheme 7 are 23663×104 yuan,13922×104m3,16878×104kWh and 57028×104 yuan,respectively.Compared with the current situation of irrigation area,the water saving rate,energy saving rate and income increasing rate of scheme 7 are 10.69%,10.38%and 6.53%respectively.The waterenergy time pattern and its distribution characteristics of reconstruction scheme 7 are calculated and analyzed.(3)Optimization of water-energy spatial-temporal pattern in the irrigation district.The relationship between decision variables and the spatial pattern of crops and irrigation technology in each sub-district is clarified.A multi-objective model for spatial-temporal pattern optimization of water-energy in the irrigation district is established by taking the minimum annual irrigation volume,the minimum annual energy consumption and the maximum crop output value as objective functions,and considering the constraints of sub-district,crop planting structure,food security,water-saving irrigation project investment,shelter forest area,flow and daily energy consumption.Based on fuzzy set theory,the membership function of each objective function is constructed,and the multi-objective optimization model is transformed into a single-objective linear programming model.When the investment is 23663×104 yuan(the same as the reconstruction scheme 7),the annual gross irrigation water,annual energy consumption and crop output value of the optimized scheme are 13 670 ×104m3,16245 × 104 kWh and 63121 × 104 yuan,respectively.Compared with the current situation of the irrigation district,the water saving rate,energy saving rate and income increase rate of the optimized scheme are 12.31%,13.75%and 15.55%respectively.Compared with reconstruction scheme 7,the water saving rate,energy saving rate and income increasing rate of optimization scheme are 1.81%,3.75%and 9.65%respectively.(4)The cooperative game optimal strategy of green development in the irrigation district.Based on the "two-handed" water control strategy of market transaction and government coordination,the driving mechanism of green development in the irrigation district is put forward to share the benefits of water saving and energy saving between farmers and management departments in the irrigation district.Taking the maximum incremental net benefit of irrigation district as the optimization objective,a linear programming optimization model of water-energy spatial-temporal pattern based on sharing water saving and energy saving benefits is constructed.A cooperative game model of income distribution based on Shapley value method is constructed.The optimization model and the cooperative game model are jointly solved,and it is calculated that the water saving and energy saving benefits shared by farmers and management departments in the irrigation district are 4294.12 × 104 yuan and 2281.49 yuan × 104 yuan.At the same time,the optimization scheme of water-energy spatial-temporal pattern in this case is obtained,which provides a scientific basis for formulating the green development strategy of irrigation district. |
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