How to cite: Kubiak-Wójcicka, K. (2019) Long-Term Variability of Runoff of Vistula River in 1951-2015. 2019 ”Air and Water – Components of the Environment” Conference Proceedings, Cluj-Napoca, Romania, p. 109-120,
DOI: 10.24193/AWC2019_11.LONG-TERM VARIABILITY OF RUNOFF OF VISTULA RIVER
IN 1951-2015
Katarzyna KUBIAK-WÓJCICKA
ABSTRACT. – This study presents the characteristics of the Vistula River runoff in the perspective of many years. Based on the daily values of Vistula flows for 9 selected hydrological stations located along the course of the river, analysis of the long-term variability of flows in hydrological years 1951-2015 was made. The work analyzes the variability of maximum, average and minimum annual flows. The highest annual flows occurred in 2010 and 1975, while the lowest in 1954, 1984 and 2012. Over the analyzed period, the difference between maximum and minimum flows has been reduced. The amplitude of annual flows demonstrates a clear downward trend. On the basis of the values of average annual flows, a hydrological classification was made, in which dry, normal and wet years were determined based on the coefficients k and sum (k-1). Normal years are characterized by average annual flows equal to or close to the average value over many years (the coefficient k is from 0.91 to 1.1). It was established that dry years predominate (k<0.9) over wet years (k>1.1). Depending on the hydrological stations, dry years were found from 22 to 29 times over the analyzed 65 years, and wet years from 15 to 23 times. Only in Tczew (the mouth of the Vistula River), both wet and dry years were found 22 times.
Keywords: runoff variability, Vistula river, Poland.
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