Research Of Optimal Water Allocation Marshalling Model For Irrigation Canals System And Model Solution

Large and medium irrigation districts play a significant role in agriculture production and even the national economy. Strengthening the utilization of water resources and optimize management in irrigation district, it will have an important impact on agricultural production, food security and sustainable use of water resources. Hence irrigation water optimized allocation in irrigation district is a key to achieve efficient management of water resources, and is also an important technical means to develop the agriculture of water saving. This paper establishes the system of water allocation marshalling of irrigation canals system on basis of the research trend in the world, establishes model of water allocation marshalling for many different irrigation canal styles, designs algorithm of fast, efficient and robust for model solution, develops a general software for irrigation canal system water optimal distribution, and discusses the fairness of water resource allocation and incentive mechanism of water saving for irrigation district to supply the scientific decision-making and basis for the water resource rational allocation of irrigation district. The contents and innovative points of this paper include:(1) The reasonable arrangement of water allocation time and discharge of each canals, realization of water allocation of large discharge and short time about irrigation canals system and reduction of water transportation loss in irrigation district management are pressing technological problems. The present optimal water delivery scheduling models are based on the assumed equal design discharges of lateral canals, which are not in accordance with practical water delivery scheduling demand in most irrigation systems. In order to solve this problem, a model of lateral canals with unequal discharges and its solution method were proposed. through joint coding of the lower channel water flow, its design flow's ratio and distribution water finish time, and scientific design of fitness function's, difficulty of constraint conditional processing in model decreases greatly, and the probability that algorithm can search the feasible solution increase remarkably. The model solution methods based on AGA (Adaptive Genetic Algorithm) and SGA (Simple Genetic Algorithm) were compared with traditional method by using a practical irrigation system example. The results show that the lateral channels water delivery time is more uniform, and the branch water distribution is more homogeneous of the water delivery plan determined with the new model than the traditional method. The model solution method based on AGA can automatically adjust to the genetic controlling parameters on the basis of values of individual fitness and degree of population dispersion, which is more rapid and stable than the GA method, so it has a higher practical value in irrigation system management.(2) In order to solve problem of multilevel irrigation canal system water distribution, a new model based on the idea of decomposition and coordination is established. As to many restriction conditions and large searching space problem in the model, solution method based on Dynamic Penalty Function And adaptive genetic algorithm is designed. This method can save feasible solution, use the part of the useful gene of infeasible solution, and can avoid optimal solutions which is premature convergence to local in the process of genetic process effectively, thereby obtaining global optimization solutions. The comparison between the optimal water allocation and the traditional method shows that there are more advantages in the method of this paper than the traditional method. For example, the model under multiple restriction conditions can be solved quickly and stably using the optimal water allocation program. Result of the water in the lateral channels is allocated more reasonably, and the superior water flow is more uniform, and the total water transportation loss is the lowest. The water delivery scheduling problems of multilevel optimal irrigation canal system can be solved, which meet the requirement of irrigation management.(3) Main canal system has a lot of branches and is complex, which make hiberarchy decomposition difficult with multilevel irrigation canal system. To solve the problems, a new model of complex irrigation canal system water distribution is established. For many node flow restriction conditions and large searching space problem in the model. Therefore, a Compound algorithm——simulated annealing hybrid genetic algorithm(SHGA) was designed, which has many advantages,such as better performance, lower complexity, easy to solve the model and the strong local searching ability and global searching ability. For example, it can analyze the model with multiple restriction conditions and node flow restriction quickly and stably use the optimal water allocation program. The water in the lateral channels is allocated more reasonably, and the superior water flow is more uniform, and the total water transportation loss is the lowest. The water delivery scheduling problems of complexity optimal irrigation canal system can be solved, which provide theoretical and technical support for complex irrigation canal system.(4) Integrated the model solution component gotten from the former research about irrigation canal system model to optimize water distribution and rapid robust algorithm and VB, the research got a general software based on the COM component which can be used in the optimal water allocation marshalling model for irrigation canals system. By using of irrigation canal system layer tree View map, simplified canal system space-layout map and canal parameters database, the software can directly demonstrate the complex linkage of upper and lower irrigation canals, space-layout structure and canal characteristic parameters of an irrigation system. The maps and the database mentioned above are linked dynamically, mentioned above can easily edit the mentioned above and space-layout map, modify the characteristic parameters of irrigation canals. [0]With the model of its high-performance integrated module algorithm, a general software for irrigation canal system water optimal distribution is developed. [0]According to different branches of canal irrigation district and the layout of structures putted up, it efficiently determined decision scheme of irrigation canal system, has strong practicality and generality. So this software can be widely used in water optimal distribution decision making of irrigation canal system.(5) Irrigation district water resources become much lesser than before, when water resources can not meet the requirements of users, they often want to obtain maximum water resources required, which can easily make them dispute for water resources. Therefore, at the basis of analyzing models based on the dynamic-weight, equitable distribute water method and negotiation and auction of water priority distribute by theory, the paper further study the system of water-saving incentives, with a view to providing a theoretical foundation for efficient utilization of agricultural water resources.The development of irrigation canal optimization water distribution is a very complex problem, including the allocation of water quantity and water flow's decision. at the basis of analyzing models based on the dynamic-weight, equitable distribute water method and negotiation and auction of water priority distribute by theory, the paper further study the system of water-saving incentives, with a view to providing a theoretical foundation for efficient utilization of agricultural water resources, therefore, this paper focuses on the irrigation canal system optimal water allocation marshalling and discussed optimization of water decision distribution. The above-mentioned gap that needs to be continuously improved in future research, meanwhile, optimization decisions of combining reservoir and canal are needed to be studied.