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Problems: The article considers the study of the influence of cavitation phenomena in hydrodynamically active areas of mountain rivers on the processes of natural self-purification of water. The paper considers the experimental results of determining the change in seasonal indicators of the hydrochemical composition of surface waters in the Stryi river basin. Objective: to determine the impact of hydrodynamically active areas (HAA) of mountain rivers on the processes of natural self-purification and to develop methods of laboratory modeling of these areas to determine the hydrochemical parameters of river waters. Methods of implementation: Research of ecological and hydrochemical factors of chemical composition of natural waters of the Stryi river basin combines basin and landscape-geochemical approaches, which allows to integrate various natural and anthropogenic influences, to identify the most important parameters for their detailed analysis. The combination of these approaches made it possible to improve the method of ecological analysis of the area of ​​the Stryi river basin, which allows to spatially differentiate and hydrochemically integrate the factors of formation of the chemical composition of natural waters. Results: It is stated that microbiological safety of water is a special problem, because even water from underground sources may contain single cells of pathogenic microorganisms, but the main threat is water re-contaminated with microbes in case of leaks in the water supply network. Conclusions: Analysis of the results of studies of the impact of self-cleaning processes in the river Stryi on the quality of water intake in Stryi showed that there are currently no negative effects of river waters of the river Stryi on groundwater deposits. The quality of river water is satisfactory for its use in domestic and drinking water supply and for recreational purposes.

МОДЕЛЮВАННЯ ТА ОЦІНКА МОЖЛИВИХ МАЙБУТНІХ ЗМІН СЕРЕДНЬОРІЧНОГО СТОКУ ВОДИ РІЧОК УКРАЇНИ……………………………………………………………… 3.1 Адаптація модуля NAM моделі Rainfall-Runoff програмного гідрологічного комплексу Mike 11 до річок, які розташовані в різних фізико-географічних зонах……………………………………. 3.1.1 Модульна структура гідрологічного комплексу Mike 11……….. 3.1.2 Основні параметри модуля NAM моделі Rainfall-Runoff……….. 3.1.3 Калібрування та верифікація модуля NAM RR Mike 11 до річок України………………………………………………………........... 3.2 Статистична реалізація методу водного балансу для репрезентативних річкових басейнів……………………………….

Anthropogenic factors cause an increase in the impact on the natural system as a whole and its components. An increase in the intensity of this influence is predicted in the 21st century, and its forms are very diverse and unevenly distributed across the globe. This is most noticeable in industrialized countries, but at the same time this influence largely depends not only on the industrial potential and the level of technology, but also on the population density and urbanization of territories. Currently, much attention is being paid to the ecological problems of river catchments, which are significantly transformed as a result of technogenic influence on the natural environment. Surface runoff of water and sediments is usually formed in the river basin as slope runoff entering the river network. The river basin regulates the surface runoff formed as a result of atmospheric precipitation, which discretely falls on its surface, transferring a significant part of it into the underground runoff. The state of forest landscapes plays an important role in the formation of floods in the Dniester basin. The forest performs important ecological functions, including water protection and soil protection. Forests stabilize soils, preventing their erosion. The presence of a sufficient area of forests contributes to the regulation of surface runoff and the hydrological regime, the prevention of soil erosion and the stabilization of riverbeds. The use of water and mineral resources, construction on the banks of rivers and the laying of engineering communications through them are always different forms of artificial influence on the natural course of channel processes, which change it to varying degrees. Measures that change the channel-forming activity of the river, disrupt the flow of sediments, or radically change the hydraulic characteristics and structure of the flow have a particularly negative impact. The generalization of the dynamics of the channel process and ecological indicators within the territories of the Carpathian region will allow us to assess their impact on the state of the river network, the change in the quality of natural waters, and predict floods.

Prykarpattia is one of the areas in Europe most prone to floods. Recent environmental research predicts a trend towards an increase in these dangerous phenomena in the Carpathian region of Ukraine. The analysis of the losses caused by floods in Lviv region shows that the allocation of funds for the elimination of the consequences of floods is growing every year. It is necessary to introduce comprehensive regulation of riverbeds, taking into account the development of channel processes and forecasting possible changes under the influence of hydraulic structures. The purpose of the study is to analyze the factors influencing landslides and erosion in the foothills of the Ukrainian Carpathians and the choice of optimal flood protection of populated areas.