Long-Term Dynamics of Major Ion Concentrations in the Water of Lake Teletskoe Tributaries in the Context of Biogeochemical Conditions in Their Drainage Basins

Abstract

The concentration of major ions (\({\text{HCO}}_{3}^{ - }\), Cl^–, \({\text{SO}}_{4}^{{2 - }}\), Ca²⁺, Mg²⁺, Na⁺, and K⁺) in the water of tributaries of Lake Teletskoe (Northeastern Altai) was studied in 2016–2020. Seasonal variations were found in the ion composition of the water of lake tributaries and a relationship between this composition and the biogeochemical conditions in their drainage basins was established. The waters of eastern and western tributaries, which drain shores with different geological and landscape structure, differ in both the concentrations and proportions of the major ions. It is shown that most of the examined tributaries belong to the same hydrogeochemical facies and carry water of bicarbonate-magnesium-calcium type. Characteristics of ion runoff of three lake tributaries were calculated; chemical denudation in their drainage basins was evaluated.