MONITORING OF ECOLOGICAL SAFETY OF WATERCOURSES BY MEANS OF OXYGEN INDICATORS

All source information for the tasks of effective management of water resources is based on the results of observations and measurements, ie on the results of monitoring. Despite the apparent advantages of assessing surface water quality using comprehensive indicators, the creation of about 30 of the most well-known comprehensive indicators of water quality since the first attempts in this field of hydrochemistry and to date, the only comprehensive indicator that combines assessment of natural masses of different water bodies objects does not exist. It is proposed to monitor one or two indicators in certain sections of the river, which characterize the ecological state comprehensively, and in case of emergencies and non-stationary situations – to conduct a complete chemical analysis of water. For this purpose it is most expedient to use oxygen indicators - dissolved oxygen and biochemical oxygen consumption.

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Regarding the choice of composite indicators of ecological safety of water in the basin of the Siversky Donets

Journal of Geology Geography and Geoecology ◽

10.15421/112157 ◽

2021 ◽

Vol 30 (4) ◽

pp. 622-631

Author(s):

Vitalii L. Bezsonnyi ◽

Roman V. Ponomarenko ◽

Oleg V. Tretyakov ◽

Vitalii V. Asotsky ◽

Andrii Y. Kalynovskyi

Keyword(s):

Drinking Water ◽

Oxygen Consumption ◽

Surface Water ◽

Water Body ◽

Ecological Status ◽

Environmental Safety ◽

Water Sources ◽

Ecological State ◽

Annual Volume ◽

Biochemical Oxygen Consumption

The lack of effective mechanisms of the methods of basin management, control of and responsibility for the ecological state of surface sources of drinking water leads to the fact that the main man-made objects that determine the ecological state of surface water sources are most often located in one oblast, while the production and consumption of the drinking water from those sources occur in the territory of other oblasts, which complicates the effective management of environmental safety of surface water sources. This is especially true for the regions of Ukraine which are poor in surface water resources, located in the basin of the Siversky Donets River, the water bodies of which are the main sources of water supply in the eastern regions of the country. The main consumer of water is Donetsk Oblast (over 50 % of the annual volume), and Kharkiv and Luhansk Oblasts together consume approximately the same volume of water per year (up to 50 % of the annual volume). Therefore, it is important to substantiate the integrated indicators of the ecological status of the water body to improve the environmental safety of surface water sources. The paper shows that oxygen indicators play an important role in the ecology of a water body. They are associated with the assimilative ability of water, the ability of water to decompose organic matter. Therefore, the content of dissolved oxygen and biochemical oxygen consumption in water is of great interest not only in terms of life development, but also as a composite measure of the ecological status of the aquatic environment. The relationship between the value of the combined index of water pollution and the value of biochemical oxygen consumption makes the indicator of biochemical oxygen consumption important for the integrated assessment of water contamination with various organic substances. For the tasks for which we justify the choice of composite measures of the ecological condition of surface waters, it is more important to identify the effects of contamination not directly at the site of contamination, but at some distance from it and after some time. Therefore, the use of the amount of dissolved oxygen and biochemical oxygen consumption as indicators that characterize the oxidation of pollutants present in water is the most appropriate for the tasks of timely monitoring of water bodies. Therefore, as a composite indicator for characterizing the condition of the watercourse and conducting timely monitoring, we chose oxygen indicators.

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Ecological assessment of the Zaporizhzya (Dniprovsky) reservoir

Naukovì dopovìdì Nacìonalʹnogo unìversitetu bìoresursiv ì prirodokoristuvannâ Ukraïni ◽

10.31548/dopovidi2021.04.004 ◽

2021 ◽

Author(s):

Y. V. Nikolenko ◽

◽

O. V. Fedonenko ◽

Keyword(s):

Water Quality ◽

Environmental Assessment ◽

Surface Water Quality ◽

High Amplitude ◽

Water Area ◽

Water Bodies ◽

Annual Data ◽

Ecological State ◽

Exposure Indicators

Environmental assessment of water is an integral part of monitoring water bodies. It provides information about water as a component of the aquatic ecosystem, the habitat of hydrobionts and an essential part of the natural environment, which is necessary for establishing environmental standards for water quality and adoption of measures to improve the ecological state of water bodies. Assessment of the quality of the ecological environment is an important parameter of sustainable development, necessary for the rational use of nature. Currently, the Zaporizhzhia (Dnipro) reservoir is exposed to increased anthropogenic impact, which affects water quality. The ecological state of the reservoir is deteriorating, and mass algal bloom is observed. The work aims to provide an integrated environmental assessment of water quality in different sites of the Zaporizhzhia reservoir. The study was conducted in 2019 at 5 sites along the course of the Zaporizke reservoir, which differ in hydrological and hydrochemical conditions: Samara Bay, Festivalnyi pier, Monastyrsky island, creek of the Mokra Sura river and the lower section of the reservoir (near Viyskove village), following generally accepted hydrobiological methods. The article calculates block indices and provides an environmental assessment of the water quality of the Zaporizhzhia reservoir according to the "Methodology for environmental assessment of surface water quality in the corresponding categories. The assessment of water quality by the criteria of contamination with salt composition components indicates that the water body condition is good at most of the studied points. The worst indicators were recorded in Samara Bay, where increased mineralization is observed for a long time. The trophic-saprobological block revealed to have the worst indicators and a high amplitude of index fluctuations. No significant deviations were observed in terms of the content of toxic and radiation exposure indicators throughout the entire studied water area, which makes it possible to assign water to the same class. It has been determined that the water quality of the Zaporizhzhia reservoir according to the average annual data is characterized as "good" in terms of the state and "clean, fairly clean" in terms of purity degree. However, during the study period, significant deviations from the average were observed, especially in the summer. There is a need for systematic monitoring of the reservoir, the establishment of annual dynamics, which will make it possible to determine the causes of deteriorating water quality and develop ways to address them.

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Analysis and forecast of the ecological conditions of surface water in Uzbekistan

Proceedings of the International conference “InterCarto/InterGIS” ◽

10.35595/2414-9179-2020-1-26-242-256 ◽

2020 ◽

Vol 26 (1) ◽

pp. 242-256

Author(s):

Bakhtiyor Kurbanov ◽

Azimjon Primov ◽

Bobir Kurbanov

Keyword(s):

Water Quality ◽

Surface Water ◽

Surface Waters ◽

High Surface ◽

Surface Water Quality ◽

Actual State ◽

Source Information ◽

Maximum Permissible Concentrations ◽

The Republic

In the Republic of Uzbekistan, an increasing shortage of water resources and insufficient supply of clean drinking water is forcing the population to use river water for domestic and drinking needs. Moreover, the health of the population largely depends on the quality of surface waters. This fact makes it relevant to monitor surface water, identify areas with high pollution, identify the most dangerous ingredients for the health of the population and take measures to minimize them. The hydrometeorological service of the Republic of Uzbekistan currently uses a methodology for assessing the quality of surface water that was developed back in 1988 and does not meet modern requirements. For this reason, in the operational practice of Russia since 2002, the “Method of a comprehensive assessment of the degree of pollution of surface waters by hydrochemical indicators” has been used, which is more promising. A method for assessing the quality of surface water is proposed, based on an analysis of the source information for all gauging stations and ingredients. This article presents the results of the development of a map of hydroecological zoning based on materials for 1997–2006 and a forecast map of hydroecological zoning for 2015. The forecast is based on hydrochemical data, which included information on the hydrochemical composition of surface waters for 1997–2006 for all posts of the republic. According to the research results, areas with increased pollution of surface water and ingredients with a significant excess of maximum permissible concentrations were identified. Among them, mercury occupies a special place. A comparative analysis of the forecast map with a map of the actual state of surface water quality, developed by us based on the materials of the hydrometeorological service of the Republic of Uzbekistan for 2014–2015, is carried out. The analysis showed a good agreement between the forecast data on the location of areas with unsatisfactory surface water quality and the actual materials, which makes it possible to use a forecast map to identify problem areas with high surface water pollution. Studies have revealed the need for high-quality laboratory chemical analyzes of water for all the ingredients included in the database of the hydrometeorological service of the Republic of Uzbekistan. In this case, special attention should be paid to such highly toxic ingredients as mercury. Urgent measures must be taken to inventory mercury sources in surface waters and measures should be developed to minimize its release.

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Assessment of the current ecological condition of the Kakhovka reservoir

Balanced nature using ◽

10.33730/2310-4678.1.2021.231885 ◽

2021 ◽

pp. 92-101

Author(s):

A. Kolisnyk ◽

V. Kuzmina ◽

T. Lepikh

Keyword(s):

Water Quality ◽

Oxygen Consumption ◽

Research Methods ◽

Natural Waters ◽

Human Life ◽

Ecological Condition ◽

Organic Content ◽

Ecological State ◽

Current State ◽

A Current

Quality assessment and analysis of a current state of natural waters, especially when it comes to reservoir waters, is a very important stage in the organization of safe drinking water supply for human life and health. The purpose of this study is to assess a current ecological state of the Kakhovka reservoir in the Dnipropetrovsk region for the period 2016–2018. The object of the study is the natural waters of the reservoir. The subject of the study is a current ecological state of the waters of the Kakhovka reservoirs within the Dnipropetrovsk region. Research methods are based on comparative-geographical, statistical, zoning and other research methods. In addition the work used: A graphic method for an integrated assessment of a surface water quality; A method for assessing the water quality in the water bodies by hydrochemical parameters. According to the results of the study of a current state of the Kakhovka reservoir waters within the Dnipropetrovsk region for the period 2016–2018, it was found that among the nine water quality indicators the priority indicators are: chemical oxygen consumption (COC) and biological complete oxygen consumption (BOcC). In most cases, these indicators were observed to exceed the limited permissible concentrations (LPC). High values of the COC indicator are a consequence of this water pollution with sewage; and high values of the BOcC index indicate a significant organic content that decomposes in the water. As a result of the analysis of the dynamics of changes in the total indicators of the LPC multiplicity, a stable improvement in the water conditions of the Kakhovka reservoir occurs in section № 4, and for other observation points an improvement in the water condition is observed in 2017 compared to 2016, and in 2018 compared to 2017 there is a deterioration in the state of natural waters.

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