Assessment of Chemical Pollution and Water Quality of Rivers in the Southeastern Part of Kaliningrad Oblast

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The article discusses the results of researches on chemical pollution and water quality of the Angrapa, Pissa, Krasnaya and Russkaya rivers, which belong to the Pregolya River basin and form the basis of the river network of the southeastern part of Kaliningrad oblast. Monitoring of these watercourses was planned and carried out at 16 sites during the 2022–2023 hydrological seasons. Hydrological measurements and sampling for subsequent chemical analysis were carried out on October 15, 2022, January 15, 2023, April 23, 2023, and July 19, 2023. The main pollutants in the rivers were identified: petroleum products, iron, sulfates, ammonium, nitrites, phosphates and non-compliance with MPC standards in terms of BOD, COD and dissolved oxygen. The specific combinatorial index of water pollution and the water pollution index were calculated and presented cartographically. The spatial differentiation of water quality in the studied rivers reflects a natural deterioration from the headwaters to the estuaries due to the increased accumulation of river runoff from agricultural lands, settlements and individual households. During the study period, the following phases of the water regime were observed: autumn low water, winter floods, spring high water, and the absence of summer low water. This factor, together with anthropogenic impacts, has a significant impact on the water quality, which varies from polluted to extremely polluted. It can be said that the ecological state of the studied watercourses and their river basins is unfavorable.

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作者简介

S. Zotov

Immanuel Kant Baltic Federal University

Email: spirin.yuriy@rambler.ru
俄罗斯联邦, Kaliningrad

Y. Spirin

Institute of Geography, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: spirin.yuriy@rambler.ru
俄罗斯联邦, Moscow

V. Taran

Immanuel Kant Baltic Federal University

Email: spirin.yuriy@rambler.ru
俄罗斯联邦, Kaliningrad

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2. Fig. 1. Map diagram of the catchment area of the Angrapa River.

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3. Fig. 2. The layout of the studied watercourses and the location of monitoring points.

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4. 3. Spatial distribution of the specific combinatorial index of water pollution in the Angrapa River basin by four hydrological seasons in 2022-2023.

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5. 4. The scheme of spatial variability of the water pollution index averaged over four hydrological seasons in the Angrapa River basin for 2022-2023.

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6. Fig. 5. Percentage distribution of the average MAC excess over all seasons and monitoring points in the Angrapa River basin for 2022-2023.

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7. 6. Dynamics of river water pollution by four hydrological seasons in the Angrapa River basin for 2022-2023.

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8. 7. Seasonal average indices of water pollution (left axis) and average four-point water consumption in the river during sampling (right axis, m3/s).

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