Analyzing changes and frequency distribution in maximum runoff volumes with different duration of the Danube River at Bratislava

Abstract

The volume of the flood waves and its importance is evaluated rarely. But, without these data, it would not be possible to imagine the extreme nature of the distribution system. Several hypotheses claim that more extremes in climatic and hydrologic phenomena are anticipated. In the present study, the annual maximum runoff volumes with t-day durations were calculated for a 144-year series of mean daily discharge of the Danube River at Bratislava gauge (Slovakia). The statistical methods were used to estimate T-year annual maximum runoff volumes and clarify how the annual maximum runoff volumes of the Danube River at Bratislava changed over period 1876-2019 and over dry and wet periods. The conclusion is that the runoff volume regime during floods has not changed significantly during the last 144 years. The annual maximum runoff volumes of the wet period have a greater impact on changes in LPIII exceedance curves at volumes with a time duration more than 20-days.

Trend changes and frequency analysis of the annual maximum volumes for various runoff duration on the Morava River at Moravský Svätý Ján

“…The trend analysis of the annual maximum runoff volumes Vtmax for Danube: Bratislava showed that the runoff volume regime during floods has not changed substantially during the last 134-years (Halmova et al, 2008) resp. 144 years (Bačová Mitková andHalmová, 2021).…”

“…Consequently, only one maximum value was included into the statistical data set for analysis of maximum runoff volumes with t=10 days runoff duration. The detailed descriptions of the method are published in Mitková, et al (2002) or Bačová Mitková and Halmová (2021). Fig.…”