Ecological and Hydrochemical Characteristics of Wetlands “Upper Dvuobye”

About the authors:

Dmitrii V. Moskovchenko, Dr. Sci. (Geogr.), Head of the Geoecology Sector, Tyumen Scientific Center of the Siberian Branch of the Russian Academy of Sciences; Lead Research Associate, Institute of Environmental and Agricultural Biology (X-BIO), University of Tyumen; moskovchenko1965@gmail.com

Aleksey G. Babushkin, Cand. Sci. (Tech.), Director of Geoinformation Systems Institute (Tyumen); ab@gisi.ru

Pavel V. Pikinerov, Cand. Sci. (Tech.), Associate Professor, Tyumen Industrial University; pavel@gisi.ru

Abstract:

The primary objective of this study was to assess the ecological status and pollution levels of water objects of wetlands “Upper Dvuobye”. Situated on the Ob River, the “Upper Dvuobye” is one of the largest wetlands in Russia. Oil development influences ecosystems of floodplain and is an important factor of water quality.

Spatial and temporal variations in the hydrochemistry of the Ob River and Yendyrskaya stream during 2003-2016 were researched. In the present study, interpretation of the data reveals that the waters are low-mineralized; reaction could be described as neutral to slightly alkaline. The results show considerably higher contents of ammonia in all hydrological seasons. Waters were characterized by higher concentrations of Mn and Fe, exceeding standard for fishery. Mn values were 3-10 times higher than the average in region.

More than 50% of the sampling sites recorded values of Pb, Cr below the detection limit.

In 2007-2008 a significant influence of oil development was observed in water chemical composition. In 2007, 75% of the Ob River water samples had values of TPH above the Russian standard for fishery. The results indicated that water quality was significantly correlated with the rate of accidents in the oil development sites. In the subsequent years, cases of pollution were rare, and ecological and geochemical status of water bodies was stabilized.

The highest TPH concentrations were observed in samples from the bottom sediments located near a drilling sites.

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