Spatial and Temporal Variability of the Timpton River Basin River Waters Chemical Composition Variability

Characteristics of the Timpton River basin river waters chemical composition spatial/temporal variability have been given according the outcomes of rivers investigation on the territory of Republic of Sakha (Yakutia) Nerungri rayon. Considerable differences in suspended and dissolved substances content caused by the local natural features and economic activities at the catchments have been shown. Higher mineralization (up to 100 mg/dm3) and hydrogen carbonate calcium water composition in water flows that drain the southern slopes of the Aldan upland formed by coal-containing of the South-Yakut coalfield have been proved. The maximal concentrations of suspended matter are typical for the rivers in the areas of the alluvial gold mining, the major ions and nitrate nitrogen concentration, i.e. the coal mining regions. It has been shown that during floods and high-water periods the Timpton River waters are characterized by low mineralization (< 25 mg/dm3) and hydrogen carbonate magnesium/calcium composition, while during summer/fall low-water periods the water downstream the Gorbyllakh River inflow is characterized by the mineralization increase up to 50 mg/dm3 and hydrogen carbonate calcium composition. The most content of ammonium nitrogen, silicon and organic matter was registered during floods and high-water periods, and the same of nitrite nitrogen and iron was registered during the summer/fall low-water period. The Timpton River and its tributaries water chemical composition was assessed in the zone of the planned construction of Kankun hydro power station.