Abstract
The aim of this research was to study the operating modes of water-passing structures that are part of the irrigation and drainage system using numerical computer modeling in the HEC-RAS environment. The paper describes the main stages of processing the source data, preparing a model, performing modeling and analyzing the results. The problem of the program description of the rules for managing a water-passing structure – a controlled gate located on a trapezoidal channel and performing the function of regulating water levels is investigated. The created rules for the operation of the structure imply a change in the position of the gate depending on the water levels in the upper and lower reaches, which ensures regulation. For the resulting model of a channel with a controlled gate, calculations were carried out for a non-steady fl ow of water, the response of the structure to a change in the fl ow rate of water was investigated, and the obtained values of water levels in the upper and lower reaches was analyzed. Based on the simulation results, conclusions were drawn about the applicability of this research method for solving problems related to the optimization of operating modes of irrigation and drainage systems.
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