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Authors = Jana Poórová

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10 pages, 5558 KiB  
Communication
Effects of the Time Period Length on the Determination of Long-Term Mean Annual Discharge
by Jana Poórová, Katarína Jeneiová, Lotta Blaškovičová, Zuzana Danáčová, Katarína Kotríková, Katarína Melová and Zuzana Paľušová
Hydrology 2023, 10(4), 88; https://doi.org/10.3390/hydrology10040088 - 8 Apr 2023
Cited by 6 | Viewed by 2176
Abstract
Currently, the 40-year-long reference period 1961–2000 is used in Slovakia for systematic assessment of the hydrological regime. The World Meteorological Organization recommends unifying the climatic normal 1991–2020 with a reference period for hydrological characteristics for the purpose of climate change research. We have [...] Read more.
Currently, the 40-year-long reference period 1961–2000 is used in Slovakia for systematic assessment of the hydrological regime. The World Meteorological Organization recommends unifying the climatic normal 1991–2020 with a reference period for hydrological characteristics for the purpose of climate change research. We have analyzed changes in the long-term mean annual discharges at 113 water-gauging stations over different time periods. Considering the history of the reference periods used in Slovakia, we have focused on the analysis of the 10, 20, 30, 40, and 50-year-long moving averages of the long-term mean annual discharges in the period 1961–2020 in comparison with the 1961–2000 reference period and the whole selected and analyzed period. The deviations of the annual flow rates for the area of Slovakia and river sub-basins have been analyzed. The results indicate that the new reference period to be used in Slovakia should include the time period after the year 2000. To determine its precise length, a more detailed analysis is needed. Full article
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15 pages, 4985 KiB  
Article
Changes in Selected Low-Flow Characteristics in the 2001–2015 Period Compared to the 1961–2000 Reference Period in Slovakia
by Lotta Blaškovičová, Katarína Jeneiová, Katarína Melová, Jana Poórová, Soňa Liová, Katarína Slivková and Beáta Síčová
Climate 2022, 10(6), 81; https://doi.org/10.3390/cli10060081 - 31 May 2022
Cited by 6 | Viewed by 2568
Abstract
This research is focused on the assessment of drought on surface watercourses in Slovakia. Low-flow characteristics and their changes in the 2001–2015 period in comparison with the 1961–2000 reference period were evaluated at selected representative water-gauging stations. Two different methods were used to [...] Read more.
This research is focused on the assessment of drought on surface watercourses in Slovakia. Low-flow characteristics and their changes in the 2001–2015 period in comparison with the 1961–2000 reference period were evaluated at selected representative water-gauging stations. Two different methods were used to calculate the flow duration curves (FDCs): the standard method, based on mean daily discharge data series for the whole evaluated period in descending order, and the alternative method, based on first calculating the values of FDCs for each year of the assessed period and then averaging the corresponding percentile values. The changes were evaluated for selected percentiles of the FDCs (330-, 355-, and 364-day discharge). The number of days with the mean daily flow below the set limits and the seasonality of their occurrence were assessed. The results show significant changes in cases of both methods in the compared time periods, while differences in individual regions of Slovakia were also found. The weakness of the standard method is in allowing the values of the smallest quantiles to be influenced by a small number of long-lasting drought episodes. The alternative method eliminates the aforementioned shortcoming and could be used to determine the ecological flows in Slovakia. Full article
(This article belongs to the Special Issue Climate Change, Hydrology and Freshwater Resources)
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