Abstract
Implementation of big scale projects on construction and operation of waterworks facilities is a serious factor of intervention into aquatic ecosystems functioning. The Bureya River and its tributaries water chemical composition was characterized with the results of the river water monitoring within the zone of the Nizhne-Bureysk hydro power station construction over the period of 2011-2014, and considerable variations of the small rivers’ water physical/chemical characteristics were demonstrated. Seasonal and many-year dynamics of the trace elements dissolved forms content was revealed. Higher concentrations of iron, manganese, copper, and mercury, as well as their considerable concentrations connected with the territory natural features were established. Small rivers’ waters that drain mostly effusive rocks are characterized by higher concentrations of iron and manganese while sediments are characterized by high concentration of aluminum. The seasonal and many-year character of the microelements dissolved forms is diverse and is mostly determined by the hydrological factor. In the high water 2013 a considerable increase in copper and barium runoff was registered in all tributaries while increase of aluminum concentration was found only in the Bureya, insignificant increase of the iron content was seen in all tributaries, and cadmium concentration increased only in some watercourses. As for all other trace elements, no marked content increase was observed.
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