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Impact of a small storage reservoir on the hydro-chemical regime of a flysch stream : A case study for the Korzeń stream (Poland)

Fudała Wioletta, Bogdał Andrzej, Kowalik Tomasz

Journal of Water and Land Development

2023

no. 59

13--24

The paper presents in form of a case study the results of 10-year long hydro-chemical studies on the Korzeń stream on which the “Skrzyszów” small storage reservoir was built. Studies aimed at evaluating the impact of the reservoir on the surface water quality in a Flysch stream. The basis for the analysis was results of 21 hydro-chemical water quality parameters, from the following groups of indicators: physical and acidity, oxygen and organic pollution, biogenic, salinity, metals. Indicators were determined in one-month intervals in two periods: 2005-2009 (before the reservoir was built) and 2015–2019 (after the reservoir was built). Obtained results were subjected to a statistical analysis. The trend analysis of changes was performed using the Mann-Kendall test or the seasonal Kendall test; significance of differences between indicator values from two periods was evaluated using the nonparametric Mann-Whitney U test. Results of analysis showed significant change trends of water quality parameters, in case of total iron concentration the trend was downward in both periods. Statistically significant differences between the values of definite majority of indicators were found in two analysed periods, indicating both favourable and unfavourable impact of the reservoir on water quality in the stream. Construction of the storage reservoir resulted in a significant change of physical and chemical indicators of water flowing in the stream. Random variation dynamics as well as tendencies and trends of changes over time have changed. In addition to modifying the stream hydro-chemical regime, the reservoir also affected the social and natural conditions.

Ocena jakości wód jezior okolic Trzcianki poddanych presji antropogenicznej

Siepak M., Kowalski A., Niedzielski P., Sobczyński T., Siepak J.

Ekologia i Technika

2001

R. 9, nr 3

74-81

W artykule przedstawiono wyniki badań fizykochemicznych próbek wód jeziora Sarcz, Logo i Smolarskiego oraz przedyskutowano otrzymane rezultaty w stosunku do klasyfikacji wód powierzchniowych pod kątem klasy czystości oraz zmian w czasie pod wpływem działalności człowieka. Na podstawie wieloletniego monitoringu stwierdzono znaczną poprawę stanu czystości wód jezior okolic Trzcianki, co świadczy, że jeziora te po zlikwidowaniu źródeł zanieczyszczeń posiadają zdolność do samooczyszczania.

The paper reports results of the physical and chemical tests of water samples from the lakes Sarcz, Logo and Smolarskie. The results are discussed in the aspect of surface water purity classification and changes in this classification caused by anthropopressure. On the basis of long-lasting monitoring of the lakes' water quality a considerable improvement of the water purity has been observed, which means that after elimination of the sources of pollution, the lakes show a great ability of self-purification.