Flood frequency analyses, statistical trends and seasonality analyses of discharge data: a case study of the Litija station on the Sava River

2014 ◽  
Vol 9 (2) ◽  
pp. 154-168 ◽  
Author(s):  
N. Bezak ◽  
M. Brilly ◽  
M. Šraj
Keyword(s):  
Flood Frequency ◽  
Discharge Data ◽  
Sava River ◽  
Statistical Trends ◽  
The Sava River

scholarly journals Contribution to the knowledge on the distribution of freshwater sponges – the Danube and Sava rivers case study

2017 ◽  
Vol 77 (2) ◽  
Author(s):  
Stefan Andjus ◽  
Nadja Nikolic ◽  
Valerija Dobricic ◽  
Ana Marjanovic ◽  
Zoran Gacic ◽  
...  
Keyword(s):  
Danube River ◽  
Sequencing Analysis ◽  
Freshwater Sponges ◽  
The Danube River ◽  
Rdna Sequencing ◽  
Freshwater Invertebrate ◽  
Sava River ◽  
Ephydatia Fluviatilis ◽  
The Sava River

Sponges in the large rivers within the Danube River Basin (DRB) have not been adequately studied. Hence, the aim of this work was to undertake an investigation on the distribution of sponge species in the Danube and Sava rivers. Out of 88 localities covered by the study, sponges were found at 25 sites only (46 samples in total). By using morphological (light and scanning electron microscopy) and genetic (28S rDNA sequencing) analysis, four species were determined: Ephydatia fluviatilis (Linnaeus, 1759), Spongilla lacustris (Linnaeus, 1759), Eunapius fragilis (Leidy, 1851), Trochospongilla horrida Weltner, 1893. In the Danube, the predominant species was found to be E. fluviatilis making approximately 80% of collected samples, while in the Sava River S. lacustris dominated, representing 46% of the river sponges. Our work represents one of the few studies on freshwater sponges within the DRB from long stretches of the large lowland rivers (more than 2500 km of the Danube River and about 900 km of the Sava River). Moreover, molecular analysis for the identification of freshwater sponges was applied on the material collected from a wide area, thus contributing to the systematic studies on the distribution and abundance of the European freshwater invertebrate fauna in general.

The Genetic Variability (RAPD) and Genotoxicity In Vivo (Alkaline and Fpg-Modified Comet Assay) in Chub (Squalius cephalus): The Sava River Case Study

2018 ◽  
Vol 12 (5) ◽  
pp. 703-712
Author(s):  
Stoimir Kolarević ◽  
Karolina Sunjog ◽  
Margareta Kračun-Kolarević ◽  
Jovana Kostić-Vuković ◽  
Jovana Jovanović ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Comet Assay ◽  
Sava River ◽  
Squalius Cephalus ◽  
The Sava River

scholarly journals Assessing the impact of climate on annual and seasonal discharges at the Sremska Mitrovica station on the Sava River, Serbia

2021 ◽  
Author(s):  
Igor Leščešen ◽  
Mojca Šraj ◽  
Milana Pantelić ◽  
Dragan Dolinaj
Keyword(s):  
Distribution Functions ◽  
Negative Trend ◽  
Flood Frequency Analysis ◽  
Positive Trend ◽  
Discharge Data ◽  
Sava River ◽  
Increasing Trend ◽  
The Impact ◽  
Gauging Station ◽  
The Sava River

Abstract Flood frequency analysis was performed on annual maxima series for 90 years (1928–2017) of discharge data recorded at the Sremska Mitrovica gauging station on the Sava River. The three-parameter distributions (PearsonIII, Log-PearsonIII) are more suitable for modelling annual maxima than distribution functions with only two parameters (Normal, Log-normal, Gumbel). The Mann–Kendall test statistic indicated that there is no statistically significant trend identified in annual maximum discharges or average annual discharges. A positive increasing trend was observed in annual temperature, while annual precipitation shows a decreasing trend which is non-significant. The seasonality analysis found a statistically non-significant weak negative trend in discharge in spring, summer and autumn and a statistically non-significant weak positive trend in winter. During winter, spring, and summer a non-significant negative trend in precipitation was observed, while autumn has experienced a statistically significant increasing trend. Temperatures show a positive trend in all seasons, but only temperatures during the warm period show a statistically significant increase. The results demonstrate that decreasing discharges of the Sava River at the Sremska Mitrovica gauging station are mainly the consequence of decreasing precipitation and increasing temperature (increasing evaporation), which is consistent with the results of other studies of the region.

scholarly journals FLOOD FREQUENCY ESTIMATION UNCERTAINTY IN DESIGN PRACTICE: CASE STUDY OF SREMSKA MITROVICA, SAVA RIVER

2018 ◽  
Vol 13 (1) ◽  
Author(s):  
Nina Kondić
Keyword(s):  
Frequency Estimation ◽  
Uncertainty Assessment ◽  
Flood Frequency ◽  
Sample Length ◽  
Estimation Uncertainty ◽  
Two Samples ◽  
Sava River ◽  
Optimum Cost ◽  
Uncertainty In Design

Flood frequency estimation is one of the most important tasks for hydraulic engineers. Design of hydraulic structures and systems require reliable estimates of high waters, which is not always easy to deliver. In this paper, uncertainty of flood frequency estimation common in practical use is presented in the case study of the Sava River at the Sremska Mitrovica hydrological station. Time series of 42 years daily flow records are statistically analysed on two samples, comprising annual maxima (AM), and peaks over threshold (POT). For uncertainty assessment, samples are analysed for several different scenarios, i.e. varying AM sample length as well as threshold flow for POT. Results indicate large uncertainty of flood frequency estimates, especially in the domen of low probabilities, as well as problem of adopting final value for practical use that will provide safety and optimum cost of the structures.

scholarly journals Lost Energy of Water Spilled over Hydropower Dams

2021 ◽  
Vol 13 (16) ◽  
pp. 9119
Author(s):  
Andrej Predin ◽  
Matej Fike ◽  
Marko Pezdevšek ◽  
Gorazd Hren
Keyword(s):  
Power Plants ◽  
Flood Events ◽  
Energy Potential ◽  
Climate Conditions ◽  
Hydropower Plants ◽  
Hydropower Dams ◽  
Sava River ◽  
Analytical Assessment ◽  
The Sava River

The present paper presents a view of water spilled over hydropower plants as an energy loss. In the current climate conditions, flood events are becoming more frequent due to human impact on the environment; water spills are also more frequent, which means more and more energy is lost. How much water is spilled and, consequently, how much energy is lost is shown in the present article on the chain of power plants on the Sava River in the five years from 2015 to 2019. An analytical assessment of the current situation in the lock was carried out, which showed that the available water through the locks could be used efficiently. The paper presents a case study of one overflow event lasting 48 h. The calculated theoretical losses of energy (of spilled water) and possible technical implementation for capturing losses are given. The proposed technical implementation is based on established technology, so we could expect that the approach is feasible. The results show that the estimated spilled water energy potential reaches about 40% of the actual spilled water or energy lost.

Contribution to the improvement of diatom-based assessments of the ecological status of large rivers – The Sava River Case Study

2017 ◽  
Vol 605-606 ◽  
pp. 874-883 ◽  
Author(s):  
Božica Vasiljević ◽  
Snežana B. Simić ◽  
Momir Paunović ◽  
Tea Zuliani ◽  
Jelena Krizmanić ◽  
...  
Keyword(s):  
Ecological Status ◽  
Large Rivers ◽  
Sava River ◽  
The Sava River

scholarly journals Determination of Cd, Pb and As in sediments of the Sava river by electrothermal atomic absorption spectrometry

2010 ◽  
Vol 75 (1) ◽  
pp. 113-128 ◽  
Author(s):  
Simona Murko ◽  
Radmila Milacic ◽  
Marjan Veber ◽  
Janez Scancar
Keyword(s):  
Nitric Acid ◽  
Analytical Procedure ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Magnesium Nitrate ◽  
Matrix Modifier ◽  
Reliable Determination ◽  
Sava River ◽  
The Sava River

The applicability of nitric acid, palladium nitrate and a mixture of palladium and magnesium nitrate as matrix modifiers was estimated for the accurate and reproducible determination of cadmium (Cd), lead (Pb) and arsenic (As) in sediments of the Sava River by electrothermal atomic absorption spectrometry, ETAAS. Decomposition of the samples was done in a closed vessel microwave-assisted digestion system using nitric, hydrochloric and hydrofluoric acids, followed by the addition of boric acid to convert the fluorides into soluble complexes. The parameters for the determination of Cd, Pb and As in sediments were optimized for each individual element and for each matrix modifier. In addition, two sediment reference materials were also analyzed. In determination of Cd and Pb, nitric acid was found to be the most appropriate matrix modifier. The accurate and reliable determination of Cd and Pb in sediments was possible also in the presence of boric acid. The use of a mixture of palladium and magnesium nitrate efficiently compensated for matrix effects and enabled the accurate and reliable determination of As in the sediments. Quantification of Cd and As was performed by calibration using acid matched standard solutions, while the standard addition method was applied for the quantification of Pb. The repeatability of the analytical procedure for the determination of Cd, Pb and As in sediments was ?5 % for Cd, ?4 % for Pb and ?2 % for As. The LOD values of the analytical procedure were found to be 0.05 mg/kg for Cd and 0.25 mg/kg for Pb and As, while the LOQ values were 0.16 mg/kg for Cd and 0.83 mg/kg for Pb and As. Finally, Cd, Pb and As were successfully determined in sediments of the Sava River in Slovenia.

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