Multi-annual and seasonal variability of low-flow river conditions in southeastern Poland

Raczyński, Krzysztof; Dyer, Jamie

doi:10.1080/02626667.2020.1826491

Cited by 16 publications

(9 citation statements)

References 65 publications

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“…and with the prevailing hillslopes with S, SW and W direction across all of the study regions. Moreover, the low-flow and drought events exhibited an increasing tendency to occur in the same parts of the year within these catchments [4,10,31]. The two highest (MOD, HOR) and the two lowest (MAR, HOL) catchment showed minor changes in the average date of low-flow/drought occurrence during the 1968-2019 period.…”

Section: Discussionmentioning

confidence: 90%

“…For most of the low-flow characteristics, there was no distinct difference between the regions, the similarities in low-flow regime were mostly found in the catchments with analogical properties across all regions. The initiation and persistence of streamflow droughts can be more dependent on local circulation of subsurface and surface water than on regional meteorological conditions [4]. Therefore, it seems to be crucial to further examine the reciprocal effects of the changing climate and the environmental characteristics of the near-natural catchments to clarify the mechanisms of runoff regime changes…”

Section: Discussionmentioning

confidence: 99%

“…The assessment of the streamflow extremes on a local scale should begin with the identification of typical seasonal variations occurring over time [3]. Due to the changing climate, these patterns may be either aggravating or weakening throughout a longer period of time [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters

Vlach

Ledvinka

Matoušková

2020

Water

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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.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters

Vlach

Ledvinka

Matoušková

2020

Water

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“…However, the increase in evaporative demand will probably aggravate the negative trends in water balance of this region (Kronenberg, Franke, Bernhofer, & Körner, 2015;Mozny et al, 2020). This is further supported by multiple authors suggesting that more humid regions in mid-latitudes might experience problems with water availability during summer seasons more frequently (Hannaford & Buys, 2012;Jenicek, Seibert, & Staudinger, 2018;Raczy nski & Dyer, 2020). The observed trends toward warmer and therefore drier summer seasons can be critical for agriculture, forestry as well as water management in Europe as a whole.…”

Section: Discussionmentioning

confidence: 67%

Impacts of regional climate change on hydrological drought characteristics in headwaters of the Ore Mountains

Vlach

Matoušková

Ledvinka

2021

River Research & Apps

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Changes in the frequency, magnitude, and seasonality of hydrological extremes are one of the expected consequences of climate change. Recent years suggested an increasing risk of drought occurrence and restricted water supply even in usually humid mountain regions. Our research is focused on the evaluation of regional climate change and its effect on hydrological drought characteristics in headwater areas in the Ore Mountains along the Czech/German border. The main aim was to evaluate and compare streamflow regime changes and trends in long-term hydrological and climatic time series within selected sub-catchments of the Svatava (Zwota) River, the Rolava River, and the Načetínský Brook (Natzschung). A comparative statistical analysis for the 1967-2018 period was performed using various homogeneity and trend tests. Longer runoff time series with earlier beginnings were examined for two catchments as well. The results pointed to significant, continuous warming in the region which is accompanied by decreasing trends in snow cover depths in the colder half

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“…They are all lowland rivers. It is well-known that low-flow formation processes differ in the highlands and lowlands [13,36,37]. Therefore, the Lithuanian river network is expected to have a homogeneous flow behavior.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Patterns of Low-Flow Changes in Lowland Rivers

Nazarenko

Meilutytė-Lukauskienė

Šarauskienė

et al. 2022

Water

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At the beginning of the 21st century, ongoing climate change led to research into extreme streamflow phenomena. This study aimed to assess the patterns of low-flow changes in different hydrological regions of Lithuania using selected hydrological indices (the annual minimum 30-day flow (m3 s−1) of the warm period—30Q), its duration, and deficit volume (below the 80th and 95th percentile flow: 30Q80 and 30Q95). Differences in low-flow indices in separate hydrological regions and over different periods (1961–2020, 1961–1990, 1991–2020) were analyzed, applying the HydroOffice tool, the TREND software package, and mapping using the Kriging interpolation. The highest specific indices of 30Q were estimated in the Southeastern hydrological region (3.97 L/s·km2) and the lowest in the Central hydrological region (1.47 L/s·km2). In general, the 30Q values in the periods 1961–2020 and 1991–2020 had no trends. In 1961–1990, trends in 30Q data were significantly positive, and positive in most investigated rivers of the Western and Central hydrological regions. The average number of dry days at both thresholds decreased in the Western and Southeastern hydrological regions and increased in the Central hydrological region comparing two subperiods.

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Multi-annual and seasonal variability of low-flow river conditions in southeastern Poland

Cited by 16 publications

References 65 publications

Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters

Changing Low Flow and Streamflow Drought Seasonality in Central European Headwaters

Impacts of regional climate change on hydrological drought characteristics in headwaters of the Ore Mountains

Spatial and Temporal Patterns of Low-Flow Changes in Lowland Rivers

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