Assessing the Ecological Status of the Voronezh Reservoir Based on the Monitoring of the Water Pollution Index

The research was carried out at the expense of the grant of the Russian Science Foundation No. 25-17-00219, https://rscf.ru/project/25-17-00219/

Authors

  • Tatiana I. Prozhorina Voronezh State University
  • Oleg V. Klepikov Voronezh State University
  • Semen A. Kurolap Voronezh State University; Belgorod State National Research University
  • Pavel A. Sukhanov Voronezh State University
  • Anastasia S. Boeva Voronezh State University

DOI:

https://doi.org/10.52575/2712-7443-2026-50-3-527-537

Keywords:

Voronezh Reservoir, Water Pollution Index (WPI), hydrochemical monitoring, priority pollutants, surface water quality

Abstract

The study was aimed at providing a comprehensive assessment of the ecological status of the Voronezh Reservoir based on the analysis of spatiotemporal dynamics of the Water Pollution Index (WPI). The study was based on data from long-term hydrochemical monitoring from January 2023 to February 2026. We conducted analysis at four monitoring sections, which representatively reflect the state of the reservoir water area within the city of Voronezh. The assessment of pollution degree was carried out in accordance with the approved WPI calculation methodology. Priority pollutants were identified, as well as zones of greatest ecological distress and seasonal patterns of water quality deterioration. The results revealed a chronical pollution of the reservoir water. We have identified a stable pollution gradient: the average annual WPI values deteriorate from 1.35–1.61 (Class III, "moderately polluted") in the upper cross-section to 3.36–3.64 (Class IV, "polluted") in the zone located downstream of the city. A clear seasonal cyclicity has been determined, with a transition to Class IV–V quality ("polluted" – "dirty" water) during the summer and autumn period. The limiting pollutants determining the high WPI level are copper, petroleum products, phosphates, and suspended solids. The absence of a positive trend over the three-year observation period indicates insufficient effectiveness of the current water protection measures.

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Author Biographies

Tatiana I. Prozhorina, Voronezh State University

Candidate of Chemical Sciences, Associate Professor at the Department of Geoecology and Environmental Monitoring, Voronezh, Russia

Oleg V. Klepikov, Voronezh State University

Doctor of Biological Sciences, Professor, Department of Geoecology and Environmental Monitoring, Voronezh, Russia

Semen A. Kurolap, Voronezh State University; Belgorod State National Research University

Doctor of Geographical Sciences, Professor, Dean of the Faculty of Geography, Geoecology and Tourism, Voronezh, Russia; Senior Research Fellow of the Institute of Earth Sciences, Belgorod, Russia

Pavel A. Sukhanov, Voronezh State University

Postgraduate Student of the Department of Geoecology and Environmental Monitoring, Voronezh, Russia
E-mail: sukhanov.1990@bk.ru

Anastasia S. Boeva, Voronezh State University

Candidate of Geographical Sciences, Senior Lecturer at the Department of Geoecology and Environmental Monitoring, Voronezh, Russia

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2026-09-30

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Prozhorina, T. I., Klepikov, O. V., Kurolap, S. A., Sukhanov, P. A., & Boeva, A. S. (2026). Assessing the Ecological Status of the Voronezh Reservoir Based on the Monitoring of the Water Pollution Index: The research was carried out at the expense of the grant of the Russian Science Foundation No. 25-17-00219, https://rscf.ru/project/25-17-00219/. Regional Geosystems, 50(3), 527-537. https://doi.org/10.52575/2712-7443-2026-50-3-527-537

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Structure and funktioning of regional geosystems

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