DISSOLVED OXYGEN REGIME OF THE LOWER REACHES OF THE URAL RIVER

This article discusses the content of dissolved oxygen, the hydrogen index in the Zhayik River. The seasonal dynamics of water temperature, hydrogen, biogenic and oxygen conditions were studied. The study of the content of dissolved oxygen in the water of the Zhayik River in various years of research. It was shown that in all seasons of research, the concentration of dissolved oxygen in water fluctuated seasonally. As a result of the study, the average level of dissolved oxygen in water at stations in the spring period was in the range of -5.7 mg/dm3. In summer, the oxygen dissolved in the river was 7.2-8.7 mg / dm3.According to many years of research, the oxygen regime of the Zhayik River ranged from 5.6 to 14.4 mg / dm³. It was revealed that the lowest oxygen saturation in the water of the Zhaiyk River was recorded in 2019. In General, during the observation period, the oxygen content in the water significantly decreases, but there are no clear patterns of its dependence on the annual flow, and certain trends in the reduction of oxygen in the water are provided. In 2002-2009, the average oxygen content in water was 9.2 mg / dm3 with an annual water flow of 7.8 km3.In the period 2012-2019, the oxygen content decreased by 1.0 mg/dm3, but it was found that the annual water flow did not change much (7.8 km3).

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