Plichko L. Modeling and predicting the state of surface water (for example of the Desna River Basin in Chernigiv region)

The thesis is devoted to solving a scientific and practical task, consisted in modeling and predicting the state of surface waters for example of the Desna River Basin in the Chernihiv region. Based on the results of the studies, mathematical models were applied for assessing and predicting the state of surface waters of two types, depending on the source of pollutants entering the surface water bodies. On the basis of dissertation research, a mathematical model has been improved, which can be used as a tool for monitoring the state of surface water in assessing the consequences of anthropogenic impact on a surface water body. The dissertation provides an example of the application of the equation of turbulent diffusion at the site of the discharge of pollutants or wastewater to obtain a predictive assessment of the dynamics of the spread of pollutants along the length of the river from a point discharge. On the example of the Desna River Basin in the Chernihiv region, the influence of anthropogenic factors on the formation of the chemical composition of surface waters was studied. In the dissertation, a geoecological assessment of the trophic state of 20 surface water bodies within the Desna River Basin in the Chernigiv region was carried out. It is proposed to use spectral indices to assess and predict the state of surface water. As a result of which, tendencies of changes in the state of surface water of the Desna River Basin in the Chernigiv region as a result of anthropogenic and natural factors were revealed. The mathematical methods, models and GIS and remote sensing technologies, which are presented in the dissertation, makes it possible to quickly find the sources of pollutants entering the surface waters with an insufficient amount of data. This is the basis for the following hydrochemical studies and revitalization of water bodies in order to improve their condition. The obtained results, conclusions and generalizations of the dissertation research are recommended for use in the study of the state of other surface waters in Ukraine.