Statistical Analysis of the Quality Indicators of the Danube River Water (in Romania)

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.

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Changes in the Quality of the Danube River Water in the Section Smederevo-Kladovo in the Conditions of Backwater Effects

Water Science & Technology ◽

10.2166/wst.1990.0027 ◽

1990 ◽

Vol 22 (5) ◽

pp. 181-188 ◽

Cited By ~ 1

Author(s):

M. Peršić ◽

M. Miloradov ◽

V. Tutundžić ◽

Z. Čukić

Keyword(s):

River Water ◽

Danube River ◽

Hydropower Plant ◽

Biochemical Processes ◽

The Danube River ◽

Global View ◽

Physico Chemical ◽

Composition And Structure

The paper describes specific changes in the quality of the Danube river water under the conditions of backwater effects in the Hydropower Plant Djerdap I storage. The results of longterm tests in five profiles of the investigated section, at various discharges give a global view of the intensity of changes in the composition of water mass. The analysis included changes in the contents of: organic matter, oxygen regime, reduction of turbidity and changes in the composition and abundance of plankton. The specific changes in the domain of physico-chemical and biochemical processes and changes in the biological status of the watercourse (composition and structure of plankton) at varying retention times complete the picture of short-term changes in the investigated system. Presentation of some settling effects and processes in the sediment of the storage provides an idea of some long-term changes in the conditions of backwater effects of the Danube in the investigated section.

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The statistical analysis of quality indicators of the Dnieper river water and directions for reconstruction of water treatment facilities of the Dnieper waterworks in Kiev

Journal of Water Chemistry and Technology ◽

10.3103/s1063455x11020081 ◽

2011 ◽

Vol 33 (2) ◽

pp. 117-129 ◽

Cited By ~ 3

Author(s):

A. E. Kulishenko ◽

V. T. Ostapenko ◽

T. B. Kravchenko ◽

E. A. Kvasnitsa ◽

R. V. Ostapenko

Keyword(s):

Statistical Analysis ◽

Water Treatment ◽

River Water ◽

Quality Indicators ◽

Treatment Facilities

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Statistical analysis of the influence of major tributaries to the eco-chemical status of the Danube River

Environmental Monitoring and Assessment ◽

10.1007/s10661-015-4740-y ◽

2015 ◽

Vol 187 (9) ◽

Cited By ~ 2

Author(s):

Konstantin Ilijević ◽

Marko Obradović ◽

Vesna Jevremović ◽

Ivan Gržetić

Keyword(s):

Statistical Analysis ◽

Danube River ◽

The Danube River ◽

Chemical Status

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The Assessment of the Danube River Water Pollution in Serbia

Water Air & Soil Pollution ◽

10.1007/s11270-017-3551-x ◽

2017 ◽

Vol 228 (10) ◽

Cited By ~ 2

Author(s):

Ljiljana Takić ◽

Ivana Mladenović-Ranisavljević ◽

Dejan Vasović ◽

Ljiljana Đorđević

Keyword(s):

Water Pollution ◽

River Water ◽

Danube River ◽

The Danube River ◽

River Water Pollution

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

Journal of Hydrology and Hydromechanics ◽

10.2478/johh-2014-0026 ◽

2014 ◽

Vol 62 (3) ◽

pp. 186-196 ◽

Cited By ~ 24

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.

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