Tymkiv M. Optimization of the network of wells of hydrogeoecological monitoring (on the example of the Prypiat river basin)

The dissertation on competition of a scientific degree candidates of geological sciences on a specialty 21.06.01 - ecological safety. - State Institution «Institute of Environmental Geochemistry of the National Academy of Sciences of Ukraine», Kyiv, 2021. The dissertation is devoted to the ecological problem - optimization of the network of hydrogeological and ecological monitoring by groundwater levels. The conducted theoretical researches allowed to take a complex approach to the solution of the set tasks. The author has built a detailed cartographic model of groundwater levels in the Prypiat River basin. The algorithm of building a network of hydrogeoecological monitoring at the local level is systematized and improved. A method of filling in data with gaps is proposed and tested, and the calculation of the reference series as a function describing groundwater levels, regardless of the amount of data being studied, is performed. The analysis of the factors influencing an ecological condition and level of underground waters within the investigated territory is carried out. Based on this, the ecological and geological risks of groundwater pollution were assessed. The total risk was calculated as the sum of the risks of damage to each of the sub-basins by amber mining zones, the impact of the territory from the activities of enterprises, the population and natural wetlands. The method of data processing for optimization of the hydrogeological monitoring network on the basis of geostatistical analysis in the geoinformation environment is presented. The final stage of the work is the optimization of the well network of the hydrogeoecological monitoring system of the Pripyat river basin. The results of geoinformation and geostatistical analysis showed the need to increase the number of existing observation wells by 2.5 times (up to 101 monitoring points). The location of the wells of the design network takes into account the zoning of the territory according to the hydrodynamic principle and corresponds to the regular scheme of distribution of observation points.. Key words: monitoring, groundwater levels, observation wells