Peculiarities of the hydrochemical regime of the Crimean rivers

The results of the study of the relationship between hydrochemical composition and water discharge based on measurements at the posts of the Crimean rivers according to hydrological yearbooks are presented. The Spearman rank correlation coefficient was used to calculate the closeness of the relationship. Three groups of rivers with peculiarities of flow formation were identified according to the nature of the relationship between changes in discharge and water composition: rivers with no relationship between discharge and the sum of ions, hardness and organic matter content, rivers with a relationship with the sum of ions, hardness and organic matter content, and rivers with a relationship only with the sum of ions. Spatial differences in water composition were investigated by cluster analysis using survey materials during the low-water period in July 2022 in the rivers of the southwestern part of Crimea. The analysis does not include elements whose concentration can be determined by anthropogenic factor (nitrates, phosphates). Inter-basin and intra-basin differences in water composition due to the different geological structure of the territory are revealed.