Dynamics of changes in surface water quality indicators of the Western Bug River basin within Ukraine using GIS technologies

Abstract

The environmental assessment of the surface water quality of the Western Bug River has been made using the system of classification quality of land surface water of Ukraine in accordance with the approved methodology, which allows comparing water quality of separate areas of water objects of different regions. The calculation of the environmental assessment of water quality has been carried according to three blocks: block of salt composition, block of trophic and saprobic (ecological and sanitary) indicators and block of indicators of content of specific toxic substances. The results are presented in the form of a combined environmental assessment, based on the final conclusions of the three blocks and consists in calculating the integral ecological index. Comprehensive studies of changes in the water quality of the Western Bug River have been conducted within the territory of Ukraine for a long-term period. The water quality of the river on the final values of the integral indicators of the ecological condition corresponded mainly to 4nd category of the 3rd class – the water is “satisfactory” by condition and “little polluted” by degree of purity (except for points of observation that located within the Volyn region, where the water quality corresponded to 3rd category and the 2nd class. It is “good” by condition and “fairly clean” by the degree of purity). Visualization and part of the analysis are performed using GIS technologies in the software of the ArcGIS 10.3.

Quality level of surface water at the control points of the western bug river (Lviv region)

“…The main contaminants of household discharges are: BOD, ammonium nitrogen, total iron, phosphates, suspended particles. In previous years, the same data were confirmed in the studies by Wozniuk et al [13], Hopchak et al [15], Chmielowski et al [17]. After getting into the surface reservoirs, they cause rapid development of plants and increase the number of zooplankton.…”

“…The studies on the assessment of the status of the Western Bug River basin have been conducted by such scientists as Klimenko, Likho [8], Zabokrytska [9], Koinova et al [10], Kozytska, Muzychenko [11], Burzyńska [12], Voznyuk and others. [13], Jacyk [14], Hopczak and others [15].…”

“…The authors of [15] point out that during 2016-2017 there was a tendency to reduce water consumption and the discharge of pollutants by industrial water users. This is due to the reduction of production needs.…”

Surface water quality of small rivers in the Ukrainian regions of right-bank Polissia

“…The rivers Horyn and Putylivka have the same characteristics (average values I 3 = 2,2-2,7, the worst values I 3 = 3,6-3,9). The water quality of these rivers corresponds to 2 and 3 categories, subcategories 2 and 3 (2) with average values of I 3 and 4th category, and subcategories 3-4 and 4, by the worst, II and III quality class, «good», «clean» and «satisfactory», «polluted».…”

Results of Surface Water Quality Monitoring of the Western Bug River Basin in Lviv Region

“…The monitoring studies of the hydro-ecological status of the river basin continue to this day, already with the use of GIS technologies. They help not only to reflect the dynamics of the water quality changes on maps, but also to track the cause and effect of anthropogenic pollutants on the aquatic ecosystem in order to predict quality in the future [Gopchak et al 2019].…”