The objective of the research is to develop a simulation model for dynamic management of water distribution at canals of open irrigation net. To achieve the objective, hydrometric “velocity – area” method for discharge characteristics of net hydraulic facilities and method for math simulation of technological processes were used. During the investigation an algorithm for creating math model was developed. The algorithm includes 8 main steps: 1) construction of plan layout of irrigation net; 2) plotting of longitudinal and cross-sectional profiles of irrigation net canals; 3) splitting of canal longitudinal profiles into calculated sections of water control; 4) determination of coefficient of efficiency of irrigation net canals; 5) determination of the values of discharges, depths, and mean velocities of water movement on calculated sites; 6) determination of duration for readjustment of depths at the boundaries of calculated irrigation net sections; 7) construction of theoretical and experimental relationships of duration for readjustment on calculated sections; 8) conducting scenario studies for the model of dynamic management of water distribution processes to optimize the use of irrigation water. Theoretical and experimental relationships for velocity of flow on the depth of canal calculated sections, as well as total duration of readjustment of the depths of calculated sections were obtained. Maximal values of asymmetry parameter and variation coefficient and experiment data were CS = 1.86 (CS < 5), Cv = 0.15 (Cv < 3) respectively. As a result of the research, simulation model of water distribution was developed. The model enables to determine total discharge in the head of a canal, actual volume of water supply, time for providing discharges for water outlets and the quantity of simultaneously working pumping units for required discharges.
Keywords: irrigation system, water distribution, dynamic management, model, automated management systems.
