Extreme low flow change analysis on the Tysa River within Ukraine

Gorbachova, Liudmyla; Khrystiuk, Borys

doi:10.31577/ahs-2021-0022.02.0023

Cited by 4 publications

(6 citation statements)

References 13 publications

(13 reference statements)

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“…The present investigation employed the mass curve, residual mass curve, and combined graphs. This methodological approach was developed by Gorbachova (2014Gorbachova ( , 2016 and applied to evaluate river flow trends (Bauzha, Gorbachova 2017;Gorbachova et al 2018;Zabolotnia et al 2019;Romanova et al 2019;Melnyk, Loboda 2020;Zabolotnia et al 2022), also including ice dynamics. (Gorbachova, Khrystyuk 2012;Gorbachova 2013;Rachmatullina, Grebin 2014).…”

Section: Methodsmentioning

confidence: 99%

Trends and fluctuations of river ice regimes in the Prypiat Basin, within Ukraine

Gorbachova¹,

Afteniuk²,

Khrystiuk³

et al. 2023

Meteorol. Hydrol. Water Manage.

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Information about the formation, destruction, and duration of river ice regimes is especially important for hydropower, shipping, fisheries, etc.Research into modern trends in river ice regimes and their spatial and temporal fluctuations is essential, especially in a changing climate. This study examines the trends and fluctuations of air temperature and ice regimes based on series of observations in the Prypiat River basin within Ukraine.Air temperature data from 17 meteorological stations and ice data from 29 water gauges were analyzed. A complex analytical approach involving statistical and graphical methods was employed. The Mann-Kendall statistical test, mass curve, residual mass curve, and combined graphs were used in the study. In the Prypiat River basin within Ukraine, observations of mean monthly air temperature, ice occurrence, freeze-up, and their duration are homogeneous (quasi-homogeneous) and stationary (quasi-stationary). The quasi-homogeneous and quasi-stationary characteristics are explained by the presence in the observation series of only increasing and decreasing phases of long-term cyclical fluctuations, which are incomplete. The trends of air temperature and ice regime correspond strongly, indicating the defining role of air temperature in the formation of ice occurrence and freeze-up. Since the end of the 1990s, the warming phase of air temperature in the autumn-winter period determines the appearance of ice and freeze-up later in the year. In March, the warming trend in air temperature, which began after 1988, determines the freezeup, break-up, and disappearance of ice earlier in the year. Thus, the duration of ice and freeze-up on the rivers has decreased.

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Section: Methodsmentioning

confidence: 99%

Trends and fluctuations of river ice regimes in the Prypiat Basin, within Ukraine

Gorbachova¹,

Afteniuk²,

Khrystiuk³

et al. 2023

Meteorol. Hydrol. Water Manage.

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“…Water is a renewable but limited natural source, an important component of natural ecosystems. As a result of human activity and climate change, growing of the extreme hydrological and meteorological phenomena in their frequency of occurrence, duration and severity are expected (Dai, 2013;Trenberth et al, 2014;Alfieri et al, 2017;Baiardi and Morana, 2021;Gorbachova andKhrystiuk 2021 or Blaškovičová et al, 2022). That may directly or indirectly affects water quality in surface waters.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of water dissolved oxygen under climate change and its modeling in Bodrog River at Streda nad Bodrogom

Bačová Mitková

2023

AHS

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The oxygen is one of indicators of water quality that plays a crucial role in affecting the biological processes in surface water. In the context of the climate change, there are also changes in the oxygen regime of the water in the streams. The paper presents an evaluation of the changes in long-term data of the dissolved oxygen (DO), water temperature Tw, biochemical oxygen demand (BOD) and chemical oxygen demand (COD), and flows (Q) in the Bodrog River at Streda nad Bodrogom, during the period of 1965-2021. The aim of the study is to detect whether significant trends occur in the time series of analyzed data. The first part of the paper dealt with the trend analyses of monthly and annual data. The results can be useful to quantify the possible threat to its balanced regime. The study shoved an increasing trend in the long-term trend of the DO and a decreasing trend in biochemical oxygen demand. The following section is focused on regression between selected components of the hydrosphere and modelling them. The ability to model the components of the hydrosphere is an essential part of water resource management.

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“…Low flows and droughts are being studied from various points of view, e.g., statistical test and trend analysis [7][8][9][10], variations of flow duration and flow duration frequency analysis [11][12][13], and the use of indicators of hydrological alteration [14].…”

Section: Introductionmentioning

confidence: 99%

Changes in Selected Low-Flow Characteristics in the 2001–2015 Period Compared to the 1961–2000 Reference Period in Slovakia

Blaškovičová

Jeneiová

Melová

et al. 2022

Climate

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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.

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Extreme low flow change analysis on the Tysa River within Ukraine

Cited by 4 publications

References 13 publications

Trends and fluctuations of river ice regimes in the Prypiat Basin, within Ukraine

Trends and fluctuations of river ice regimes in the Prypiat Basin, within Ukraine

Evaluation of water dissolved oxygen under climate change and its modeling in Bodrog River at Streda nad Bodrogom

Changes in Selected Low-Flow Characteristics in the 2001–2015 Period Compared to the 1961–2000 Reference Period in Slovakia

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