Kovalenko R. Improvement of water quality management for irrigation in the Ingulets river basin by scenario ecosystem modeling methods

The dissertation is a complete scientific research, which solves the actual scientific and applied problem of improving the water quality for irrigation, integrated by economic and ecological criteria, on the basis of scenario ecosystem modeling and optimization of technological solutions of flushing in Ingulets river by using pulse method in combined management. Methodologically, improvement of monitoring is based on the proposed model of the neural network. Which makes it possible to conduct a spatio-temporal estimation of the suitability of water for irrigation, assessment and graphical comparison of water quality classes along the Ingulets river, according to environmental and agronomic criteria in accordance with current state standards. The impulse method is proposed in the system of combined flushing control. To substantiate the impulse method, an experimental study was carried out, which showed a significant effect of diffuse and point sources of pollution on the deterioration of water quality during the growing season. It is necessary to install near the GNS of the Ingulets Irrigation System and in the village. Andriyivka monitoring the quality of water and, if necessary, delivering the impulse of flushing with Dnieper water from the Karachunov reservoir using a feedback link. To adequately assess the situation, a model and a computer program have been developed that implements various scenarios of flushing methods for environmental improvement in Ingulets. Scenario analysis allows us to choose integrated flushing management systems that provide cost-effective water management and environmental improvement in Ingulets. The decision-making process is based on two-criteria optimization of environmental and economic indicators. It is proposed as the most effective type scenario, which provides the flushing of the Ingulets riverbed without leaving highly polluted water on the floodplain, provides agronomic and environmental indicators within the normative values at sufficiently efficient water resources expenditures.