Firstly, the optimization goal, feasible decision-making scheme and constraint conditions are determined. Sometimes there is only one optimization goal, such as determining the maximum economic benefit or water supply, or determining several target values, such as selecting representative goals in economy, environment and society respectively. Determining feasible decision-making schemes refers to all feasible decision-making schemes in water resources system, such as the determination of water supply projects or the feasibility of deployment schemes. When analyzing the optimization of the system, all constraints should also be determined. If the constraints are ignored or the design is incorrect, the optimization scheme may be incorrect or not optimal.
Secondly, establish a mathematical model, that is, use the mathematical model to simulate and describe the characteristics, mutual influence and function of various influencing factors in the system. In practical planning, some decision variables are difficult to be represented by numbers, so special skills are needed to solve unstructured problems.
Thirdly, mathematical model solving, that is, determining the calculation parameters of the model according to the selected mathematical model, selecting the appropriate analysis and calculation method, and obtaining the optimal solution. Finally, sensitivity analysis is needed to analyze the parameter range contained in the model and its influence on the optimal solution.
Fourthly, the best calibration method to verify the calculation results is to select reliable actual system records to compare with the model performance and output results, and then adjust the calibration parameters to ensure the accuracy and reliability of the model output results.
In addition, Qiu Lin and others put forward the large-scale system decomposition coordination model of regional water resources optimal allocation, multi-objective optimization model of crop insufficient irrigation system, optimal allocation of water resources among crops and crop planting structure model, and studied the optimal allocation of water resources among regions [6].
refer to
[1] Ministry of Water Resources. Rational allocation of water resources in China [J]. China Population, Resources and Environment, 2003, (2): 124.
[2] Gan Hong, Li, Yin Mingwan. Analysis of rational allocation of water resources [J]. China Water Conservancy, 2000, (4): 20 ~ 23
[3] Li Xiaoming. Analysis on optimal allocation of water resources [J]. Research on water conservancy development, 2003, (12): 25 ~ 27.
Wang Hao, Wang Jianhua and Qin Zaiyong. Research progress and development direction of rational allocation of water resources in river basins [J]. advances in water science, 2004, (1):123 ~128.
[5] Xu Zhenci. Theory and method of optimal allocation of regional water resources [J]. Hebei Water Conservancy, 2003, (6): 22 ~ 26
Qiu Lin, Xu Jianxin, Chen Nanxiang, et al. Theory and application of regional water resources sustainable utilization management [M]. Henan: yellow river water conservancy press, 2003, 79 ~ 98.
[7] Zuo Qiting, Chen. Sustainable water resources planning and management [M]. Beijing: China Water Resources and Hydropower Press, 2003, 142 ~ 143.
Lin. Theory and practice of water resources management [M]. Beijing: China Water Resources and Hydropower Press, 2003,288 ~ 291