scholarly journals Statistical Analysis of Hydrological Regime of the Danube River at Ceatal Izmail Station

2019 ◽  
Vol 221 ◽  
pp. 012035
Author(s):  
Pavla Pekarova ◽  
Liudmyla Gorbachova ◽  
Veronika Bacová Mitkova ◽  
Jan Pekar ◽  
Pavol Miklanek
Keyword(s):  
Statistical Analysis ◽  
Hydrological Regime ◽  
Danube River ◽  
The Danube River

scholarly journals Statistical Analysis and Trend Detection of the Hydrological Extremes of the Danube River at Bratislava

2021 ◽  
Vol 906 (1) ◽  
pp. 012101
Author(s):  
Veronika Bacová Mitková
Keyword(s):  
Statistical Analysis ◽  
Anthropogenic Activities ◽  
Water Levels ◽  
Danube River ◽  
Trend Detection ◽  
The Danube River ◽  
Natural Processes ◽  
The Past ◽  
Hydrological Extremes ◽  
Measured Water

Abstract The territory of the Danube River Basin is one of the most flood-endangered regions in Europe. The flow regime conditions of the Danube River are continually changing. These changes are the result of natural processes and anthropogenic activities. In the present study, we focused on the statistical analysis and trend detection of the hydrological extremes of the Danube River at Bratislava. This paper firstly analyses the changes in correlation between water levels of the Danube River at Bratislava and Kienstock. Studied period of 1991-2013 included one or three hour measured water levels of the Danube River at Bratislava and Kienstock and shorter periods (1991–1995, 1999–2002, and 2004—2013) were selected for identification of the water level changes at Bratislava. One of the factors that recall the necessity to establish empirical - regression relationships was increasing of water levels of the Danube River at Bratislava (due to sediments accumulation at Bratislava). The results of the analysis indicated an increasing of water levels corresponding to the same flood discharges observed in the past. We also can say that travel time of the Danube floods between Kienstock and Bratislava did not change significantly during the analysed period. In the second part of the paper, we have identified changes in commonly used hydrological characteristics of annual maximum discharges, annual discharges and daily discharges of the Danube River at Bratislava during the period of 1876–2019. We examined whether there is a significant trend in discharges of the Danube River at Bratislava.

scholarly journals Temporal variation of water discharges in the lower course of the Danube River across the area from Reni to Izmail under the influence of natural and anthropogenic factors

Energetika ◽  
2019 ◽  
Vol 65 (2-3) ◽  
Author(s):  
Yelyzaveta Romanova ◽  
Zhannetta Shakirzanova ◽  
Valeriya Ovcharuk ◽  
Olena Todorova ◽  
Iuliia Medvedieva ◽  
...  
Keyword(s):  
Temporal Variation ◽  
River Runoff ◽  
Water Exchange ◽  
Water Discharge ◽  
Hydrological Regime ◽  
Danube River ◽  
Anthropogenic Factors ◽  
The Danube River ◽  
Runoff Regime ◽  
Natural And Anthropogenic Factors

The Danube River mouth is a main source for fresh water used for water supply and irrigation purposes in the arid southern part of Ukraine. In addition, the water of the mouth is used for filling the Danube Lakes. Climate change and numerous social and economic factors reduce the area and the water level of the Danube Lakes and increase their salinity. Under these circumstances the water exchange between the Danube River and the lakes is a very important process which allows maintenance of the water–salt balance of the latter. Such water exchange massively depends on the Danube River regime. The paper presents research of temporal variation of typical water discharges in the lower course of the Danube River associated with assessment of natural and anthropogenic factors affecting river runoff fluctuations. Time series of annual average water discharge at the water gauging stations of such cities as Reni and Izmail were considered uniform for the selected periods. They cover the period of conventionally natural river runoff regime (1840–1920), the period of the least altered river runoff regime (1921–1960) and the most altered river runoff regime under a heavy anthropogenic influence (1961–1989). The analysis of the impact of climate changes on the river runoff allowed introduction of a new, modern period of the Danube River hydrological regime (1990–2015). It is established that the series of maximum and minimum water discharges are characterized by the lack of their uniformity from the beginning of the period of initial influence of hydraulic engineering structures on the hydrological regime (since 1961). The analysis of the aggregate multi-year series (1840–2015) of average annual, maximum and minimum water discharges of the Danube River across its length from Reni to Izmail showed the presence of positive trends. At the same time the period of climatic changes (after 1989) is characterized by a less intensive growth of maximum water discharges. The research resulted in establishing the periodicity and synchronism of water discharge fluctuations in the lower course of the Danube River from Reni to Izmail within the territory of Ukraine. In particular, the study showed for the first time that from the 2000s onwards the redistribution of river runoff between the Danube River branches led to unsynchronization of minimum river runoff in different parts of the Danube Delta. The research shows that comprehensive analysis of the Danube River hydrological regime under modern climatic conditions is required to ensure efficient engineering regulation of the Danube Lakes filling pattern. Such regulation, in its turn, will ensure that the water supply and irrigation purposes are achieved.

scholarly journals Joint modeling of flood peak discharges, volume and duration: a case study of the Danube River in Bratislava

2014 ◽  
Vol 62 (3) ◽  
pp. 186-196 ◽  
Author(s):  
Veronika Bačová Mitková ◽  
Dana Halmová
Keyword(s):  
Statistical Analysis ◽  
Joint Modeling ◽  
Danube River ◽  
Return Periods ◽  
Copula Functions ◽  
The Danube River ◽  
Wide Range ◽  
Bivariate Statistical Analysis ◽  
Hydrological Variables

Abstract The study is focused on the analysis and statistical evaluation of the joint probability of the occurrence of hydrological variables such as peak discharge (Q), volume (V) and duration (t). In our case study, we focus on the bivariate statistical analysis of these hydrological variables of the Danube River in Bratislava gauging station, during the period of 1876-2013. The study presents the methodology of the bivariate statistical analysis, choice of appropriate marginal distributions and appropriate copula functions in representing the joint distribution. Finally, the joint return periods and conditional return periods for some hydrological pairs (Q-V, V-t, Q-t) were calculated. The approach using copulas can reproduce a wide range of correlation (nonlinear) frequently observed in hydrology. Results of this study provide comprehensive information about flood where a devastating effect may be increased in the case where its three basic components (or at least two of them) Q, V and t have the same significance.

Mollusks of the Genus Corbicula in the Ukrainian Section of the Danube River

2011 ◽  
Vol 47 (3) ◽  
pp. 39-47 ◽  
Author(s):  
V. V. Makovskiy ◽  
A. V. Lyashenko
Keyword(s):  
Danube River ◽  
The Danube River
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