SALINATION OF RIVER WATERS UNDER THE CONDITIONS OF URBOLANDSCAPE GEOSYSTEMS AND CLIMATE WARMING
Authors:   Kharkiv National University V. N. Karazina, Rychak Nataliya , Kizilova Natalya ,   Kharkiv National University V. N. Karazina
Published: January 2022

Purpose. The growth of surface water salinity in urban landscapes due to both anthropogenic factors and gradual global climate change is studied. The influence of various factors is analyzed, according to the data that have been published in recent years. Methodology. Statistics on the state of surface waters, acidity of precipitation and the quality of drinking water in Ukraine show that in the southern and south-eastern regions the situation is becoming threatening. As Kharkiv region is one of the three leaders in the demands for drinking and technical water among the regions of Ukraine, the analysis of water sources in the Kharkiv region is carried out. Results. The results of measurements of chemical parameters of water samples from different parts of the river system Kharkiv-Lopan-Uda in Kharkiv: at the entrance of each river into the city, at industrial sites, at the mouth and at the exit of the river Uda from the city. It is shown that in recent years there has been a steady increase in the total concentration of salts. The rivers Kharkiv, Lopan and Udy at the entrance to the territory of Kharkiv have a fairly low content of sulfates, chlorides, magnesium and calcium, but after the passage of industrial areas to the city center there is a significant increase in salinity and water hardness. Our own data are in good agreement with the results of water quality tests by other laboratories. Thus, in the context of global climate change, the salt content in the river system Kharkiv-Lopan-Uda increases, which significantly affects the system of groundwater and drinking water. Originality. In the research the detailed data on concentrations of the ions Cl-, SO42-, Са++, Mg++ in 12 locations along the three rivers (Kharkiv, Lopan, Udy) of the complex river sys- tem in different seasons (spring, summer, autumn) have been studied and compared to similar data from open sources. The statistical dependencies of the relative concentrations during the last 40 years have been analyzed. Practical meaning. It is determined that the concentrations of some ions demonstrate the monotones growth during the last years, while others varies non-monotonously. Therefore, the influence of different natural and antropogenic factors on global gradual increase in the river water salinity can be quantified by a complex index weighted over a set of concentrations. Conclusions. The results of the literature and measurement data analysis confirmed that with increasing anthropogenic factors and global climate change, the level of surface and groundwater in the urban area of Kharkiv region will decrease and their quality will deteriorate due to increased salinity, calcification and levels of a number of pollutants, which requires further detailed study of this complex problem, permanent data monitoring and systematization in the open access sources of information, which can be processed both by statistical methods and with the help of new system dynamic approaches for the dynamical systems with the ability to control and stabilize the system.