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Article

Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters

1
Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic
2
Czech Hydrometeorological Institute, Hydrology Database and Water Budget Department, Na Sabatce 2050/17, 143 06 Prague 412, Czech Republic
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3575; https://doi.org/10.3390/w12123575
Received: 11 November 2020 / Revised: 17 December 2020 / Accepted: 18 December 2020 / Published: 20 December 2020
(This article belongs to the Special Issue Statistical Approach to Hydrological Analysis)
In the context of the ongoing climate warming in Europe, the seasonality and magnitudes of low flows and streamflow droughts are expected to change in the future. Increasing temperature and evaporation rates, stagnating precipitation amounts and decreasing snow cover will probably further intensify the summer streamflow deficits. This study analyzed the long-term variability and seasonality of low flows and streamflow droughts in fifteen headwater catchments of three regions within Central Europe. To quantify the changes in the low flow regime of selected catchments during the 1968–2019 period, we applied the R package lfstat for computing the seasonality ratio (SR), the seasonality index (SI), mean annual minima, as well as for the detection of streamflow drought events along with deficit volumes. Trend analysis of summer minimum discharges was performed using the Mann–Kendall test. Our results showed a substantial increase in the proportion of summer low flows during the analyzed period, accompanied with an apparent shift in the average date of low flow occurrence towards the start of the year. The most pronounced seasonality shifts were found predominantly in catchments with the mean altitude 800–1000 m.a.s.l. in all study regions. In contrast, the regime of low flows in catchments with terrain above 1000 m.a.s.l. remained nearly stable throughout the 1968–2019 period. Moreover, the analysis of mean summer minimum discharges indicated a much-diversified pattern in behavior of long-term trends than it might have been expected. The findings of this study may help identify the potentially most vulnerable near-natural headwater catchments facing worsening summer water scarcity. View Full-Text
Keywords: low flows; streamflow drought; minimum discharges; headwater; seasonality; trends low flows; streamflow drought; minimum discharges; headwater; seasonality; trends
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MDPI and ACS Style

Vlach, V.; Ledvinka, O.; Matouskova, M. Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters. Water 2020, 12, 3575. https://doi.org/10.3390/w12123575

AMA Style

Vlach V, Ledvinka O, Matouskova M. Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters. Water. 2020; 12(12):3575. https://doi.org/10.3390/w12123575

Chicago/Turabian Style

Vlach, Vojtech, Ondrej Ledvinka, and Milada Matouskova. 2020. "Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters" Water 12, no. 12: 3575. https://doi.org/10.3390/w12123575

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