Study On The Irrigation District Water Cannal System Optimization And Application In Pishihang Irrigation

This paper focuses on Optimization problem of water allocation of the Pishihang Irrigation port River upstream hangbu irrigation canal, discusses the entire of the Pishihang River Irrigation District main canal work under the present circumstances, and under its existing water resources in irrigation canal management of the operation were evaluated.For Pishihang irrigation canal irrigation water and the comprehensive management of the conflict between the existing canal system into full play the function, to achieve maximum utilization coefficient of irrigation water that minimize leakage and maximize the utilization of water resources. This article focuses on analysis of existing irrigation channel leakage calculation method, the accurate calculation of channel leakage, reasonable channel water, water distribution scale for the future of the optimal allocation of irrigation water, saving state investment, but also for irrigation Pishihang optimal allocation of water resources and integrated management has important practical significance.Based on the above purpose, irrigation district under the jurisdiction of Pishihang network elm branch canal seepage loss of water flow background of long-term field data on channel seepage losses, channel water efficiency and evaluation methods are discussed, using a large and dynamic system decomposition and coordination planning method combining irrigation canal system established to minimize leakage optimization model for the objective function. The model results are close to optimal value, with practical, operational and other characteristics, for the other reference for water project construction.Details are as follows:(1) Irrigation channels, water loss measurement and analysis of key factors Pishihang Irrigation is a complex multi-level irrigation canal, the canal water to ensure the establishment of a typical optimization model and operability, the many factors affecting the loss of water in the channel to identify major factors. You can also irrigation channels Pishihang three construction and management have a preliminary understanding.(2) The establishment of irrigation water canal system to optimize multi-level coordination model.P Hangbu River Irrigation District is a complex multi-level irrigation canal system.variable dimensions type and has a more complex coupling characteristics:the same time, irrigation systems and subsystems of the overall goal of the relationship between the objectives of both the close and mutually constraining contradiction. For these reasons this paper, the trunk canal water with minimal loss in the objective function to round period of restraint, water binding, water balance for the establishment of trunk canal water constraint optimization model for water flow and optimize the trunk the allocation of time. (3) Non-linear programming model to optimize the dynamic solution. There are constraints for the model number of cases and variables, the design method based on nonlinear programming model solution methods, results and experience a comparative analysis of water flow distribution, the results show that the algorithm used to solve more quickly under the model constraints issues to ensure the trunk near the headworks and water flows under the premise of flow, the higher channel water flow is more uniform and the total water loss, etc, significantly increased irrigation water use efficiency to meet the needs of irrigation management.