Hydro/chemistry of the «Tumninskiy» Nature Reserve Rivers

Intensification of economic activities (construction of terminal for liquefied hydrocarbon gas, coal and alumina trans-shipment) in the Khabarovsk Kray Vanino Rayon made it necessary to determine the dissolved substances background concentrations in the river waters. The 2015 observations in the Vanino Rayon “Tumninskiy” nature reserve enabled to establish spatial variability of the substances content in the small rivers’ water during the summer-fall low water period. According to the 1966–1982 Rosgidromet data the characteristic of the Tumnin River water chemical composition has been given. Differences in the dissolved substances content in the natural reserve rivers’ waters caused by the territory natural/climatic special features have been revealed. The mineralization low values (<55 mg/dm3) and hydro/carbonate/calcium composition of the Tumnin River and its left-side tributaries’ waters have been shown. The sodium ions and chloride ions higher concentrations (at the average 2.0 mg/dm3 higher) and mineralization values (10 mg/dm3 higher) have been registered in the Tatar Strait coast mainland part rivers’ waters outside the zone of the high/low tides flows influence. Higher concentrations of aluminum, iron, manganese and organic matter have been found in the Tumnin River basin small rivers’ waters draining wetlands in the catchment lower parts. Nitrates nitrogen maximal concentrations have been notices in the Tatar Strait coast continental part rivers’ waters whose catchments had been affected by forest fires. The higher concentrations of silicon and mineral phosphorous have been shown in the small rivers’ waters draining deposits of volcano origin. Dissolved microelements concentrations in the conditions of the river waters low mineralization are comparatively low.