INFLUENCE OF GEOLOGICAL CONDITIONS ON FORMATION OF CARBONATE-HYDROCARBONATE WATERS OF THE KOSKORGAN RESERVOIR

https://doi.org/10.48498/minmag.2026.250.2.003

The carbonate-hydrocarbonate composition of the surface waters of the Koskorgan reservoir is formed in conditions of an arid climate and the carbonate geological structure of the catchment, which determines its hydrochemical specificity. The work analyzed the seasonal dynamics of HCO₃⁻ and CO₃²⁻ ions according to field observations of 2023–2025. The concentrations of hydrocarbonates ranged from 142.3 to 197.6 mg/dm³, the average values for the seasons were 168–185 mg/dm³ with a standard deviation of 14-26 mg/dm³ and a coefficient of variation of 8–15%, which indicates the relative stability of the hydrocarbonate system. It has been established that a seasonal increase in carbonate content can reduce the irrigation suitability of water due to the risk of alkalization of soils, which must be taken into account when using the Koskorgan reservoir for water management.

N. Abdimutalip, *G. Toychibekova, K. Baeshova, A. Adilbay