Temperature and chemical composition of thermo-mineral water from Daginsky Sources (Sakhalin Island) after reconstruction of the captation structures in 2019–2020

Abstract

The paper presents the results of the study of physical and chemical characteristics of thermo-mineral waters of the Daginsky field (Sakhalin Island) after the reconstruction of the captation structures in 2019–2020. The analysis of the data indicates the stability of the chemical composition of thermo-mineral waters before and after reconstruction works on the territory of springs. The thermo-mineral waters had a typical Cl-Na composition, and the values of the hydrogeochemical indicators did not exceed the range of values established by the analysis of data for these waters over a multi-year period (1958–2019). However, for most of the springs whose captation structures underwent reconstruction, a significant drop in the surface temperatures of thermo-mineral waters (by 5–15°C) was recorded. The indicated temperature anomaly is not related to changes in the origin of discharged thermo-mineral waters or to seasonal air temperature variation. The observed drop in temperatures may be a consequence of a decrease in the flow rates of the springs after construction work, as well as technically incorrect design of the thermal baths.

Keywords

• thermo-mineral springs
• temperature regime
• chemical composition
• sakhalin island