Study of the Influence of Spring Discharge on the Chemical Composition and Temperature of Surface Waters in the Upper Reaches of the Vishera River

The article presents the results of study of the impact of spring discharge on the chemical composition and tem-perature of surface waters in the upper reaches of the Vishera River. The research was conducted during the summer low-water period from 2018 to 2022. Data analysis showed that the water quality complies with MPC standards, which is apparently due to the remoteness of the area from large settlements, industrial enterprises, and transport routes. It has been established that subaquatic karst springs play a significant role in the formation of river flow, providing 22–36% of its total volume. Changes in the chemical composition of water are associat-ed with dissolution of carbonate rocks that form the composition of groundwater, as well as with the peculiarities of the migration of chemical elements in the study area. The data obtained expand our understanding of the hy-drogeological, hydrological, and hydrogeochemical processes in the Visherskiy Conservation area. The im-portance of monitoring the clandestine groundwater that discharges into the riverbed is emphasized for assessing the state of water bodies in both protected and urbanized areas.