Model to Study the Hydraulic Performance of Controlled Irrigation Canals

摘要

The function of an irrigation canal system is to convey and distribute irrigation water throughout an irrigation scheme. The aim of the study was to develop a tool to analyze the unsteady flow in irrigation systems in order to improve the daily operation of these systems. A new model has been developed to simulate and evaluate the hydraulic performance of controlled irrigation canal systems for unsteady flow conditions. Various case studies have been carried out in order to demonstrate the applications and limitations of the developed model. All case studies are dealing with the daily operation of irrigation systems. Several (manual, automatic, self-regulating and non-selfregulating) irrigation canal control systems have been investigated on their operational performance for unsteady flow conditions. In conclusion, it can be stated that the unsteady flow phenomenon should be taken into account in the daily operation of different types of irrigation canals in order to improve the water distribution performance. The developed model proved to be a convenient and powerful tool to determine the timing and magnitude of operational instructions that are required to achieve this improved distribution performance. With this model the effects of alternative control systems and operation strategies can also be quantified in advance. By doing so, problems in the operation phase can be reduced.