Spatial Distribution of Nutrient Limitation in the Danube River Floodplain in Relation to Hydrological Connectivity

Wetlands ◽  
2011 ◽  
Vol 31 (5) ◽  
pp. 933-944 ◽  
Author(s):  
Vesna Peršić ◽  
Janja Horvatić
Keyword(s):  
Spatial Distribution ◽  
Nutrient Limitation ◽  
Danube River ◽  
Hydrological Connectivity ◽  
River Floodplain ◽  
The Danube River

scholarly journals Spatial distribution of PAHs in riverbed sediments of the Danube river in Serbia: Anthropogenic and natural sources

2019 ◽  
Vol 84 (12) ◽  
pp. 1439-1453
Author(s):  
Maja Brboric ◽  
Branislav Vrana ◽  
Jelena Radonic ◽  
Mirjana Vojinovic-Miloradov ◽  
Maja Turk-Sekulic
Keyword(s):  
Spatial Distribution ◽  
Sediment Quality ◽  
Principal Component ◽  
Danube River ◽  
Biomass Combustion ◽  
Diagnostic Ratios ◽  
Multivariate Techniques ◽  
Natural Sources ◽  
The Danube River ◽  
Riverbed Sediments

The top layer of riverbed sediments from 10 sites along the Danube River in Serbia were analysed for the presence of polycyclic aromatic hydrocarbons (PAHs). Potential sources of pollution were identified using different multivariate techniques. Total concentrations of 29 PAHs in sediment samples ranged from 128.27 to 676.85 ?g/kg dry weight. Based on these concentrations and PAH patterns, a clear spatial distribution of examined localities was determined. The diagnostic ratios indicated a pyrolytic origin of PAHs, except for two sites where PAH contamination originated from petrogenic sources. The Varimax rotated principal component analysis revealed three main factors, namely coal, wood, and biomass combustion; vehicular emissions; and natural sources; accounting for 92.1 % of the variance in the original datasets. The sites with different pollution load, depending on main sources identified, were arranged by hierarchical cluster analysis. The results were compared with sediment quality guidelines, and the obtained values of equilibrium partitioning sediment benchmarks toxic unit and total toxic equivalent quantities of benzo- [a]pyrene suggested that Danube sediments do not pose an elevated ecotoxicological risk for benthic organisms.

scholarly journals Spatial Distribution of multielements including technology critical elements in sediments of the Danube River

2020 ◽  
Author(s):  
Otilia Ana Culicov ◽  
Tatjana Trtic-Petrovic ◽  
Roman Balvanović ◽  
Anđelka Petković ◽  
Slavica Ražić
Keyword(s):  
Spatial Distribution ◽  
Surface Sediments ◽  
New Technologies ◽  
Analytical Data ◽  
Danube River ◽  
The Danube River ◽  
Critical Elements ◽  
Iron Gate ◽  
Hydropower Dam ◽  
Two Samples

Abstract Background The pollution of the second-longest European river (the river Danube) has been under monitoring and focused on various contaminants including metals/metalloids (Hg, As, Ni, Zn, Cu, Cr, Pb, and Cd), personal care products, technical additives, pesticides, pharmaceuticals, etc. Recent studies show that technology critical elements (TCE) – elements with a high supply risk and economic importance – are becoming emerging pollutants due to their wide application in new technologies. According to the European Union Water Framework Directive, sediments are one of the three major sources of river pollution. This study aims to determine major and trace elements including some TCEs in the Danube River sediment. The concentrations of the targeted elements in the surface sediments were discussed in the sense of the effect of building hydropower dam Iron Gate I and increasing the quantity of sediments in the Iron Gate gorge. Results The surface sediments were collected on the Danube River-km 1141 to 864 and three tributaries along this waterway. Two samples of deep sediments were used for comparison. Instrumental Neutron Activation Analysis was applied for quantification of 36 elements, with special attention to selected TCE belonging to lanthanides (La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Tm, and Yb). Spatial distribution is discussed (i) in the total pool of all analyzed elements and (ii) only lanthanides. For better understanding and to highlight a hidden relationship between targeted elements, multivariate statistical techniques (cluster analysis and principal component analysis) were applied to analyze the analytical data and to identify possible pollution sources. The obtained results of the targeted elements in the surface sediments were discussed in relation to the influence of hydropower dam Iron Gates I and the increasing quantity of sediments. Conclusion Overall results show increasing concentration of almost all investigated elements in the surface sediments from the Danube River-km 1112 to the dam. Sediment od the River Pek was separated as a location with extreme anthropogenic influence due to close vicinity of the copper mining site.

scholarly journals Identification of conservation and restoration priority areas in the Danube River based on the multi-functionality of river-floodplain systems

2019 ◽  
Vol 654 ◽  
pp. 763-777 ◽  
Author(s):  
Andrea Funk ◽  
Javier Martínez-López ◽  
Florian Borgwardt ◽  
Daniel Trauner ◽  
Kenneth J. Bagstad ◽  
...  
Keyword(s):  
Danube River ◽  
River Floodplain ◽  
Priority Areas ◽  
The Danube River

scholarly journals Crustacean plankton abundance in the Danube River and in its side arms in Hungary

Biologia ◽  
2009 ◽  
Vol 64 (6) ◽  
Author(s):  
Csaba Vadadi-Fülöp ◽  
Levente Hufnagel ◽  
György Jablonszky ◽  
Katalin Zsuga
Keyword(s):  
Spatial Distribution ◽  
Water Discharge ◽  
General Pattern ◽  
Danube River ◽  
Crustacean Zooplankton ◽  
Zooplankton Abundance ◽  
Total Density ◽  
The Danube River ◽  
Tukey Test ◽  
Crustacean Plankton

AbstractThe spatial distribution and seasonal dynamics of the crustacean zooplankton were studied in the Danube River and in its side arms near Budapest, Hungary. Microcrustaceans were sampled biweekly from October 2006 to November 2007 at eleven sites. Thermocyclops crassus, Moina micrura and Bosmina longirostris added up to 57.6% of the total density. Comparisons of the different water bodies stressed the separation of the eupotamal and parapotamal side arms. Densities in the side arms were one respectively two orders of magnitude higher as compared to the main channel, which was relatively poor in plankton. There were remarkable longitudinal and transversal variations in the abundance of the major zooplankton groups (cladocerans, adult copepods, copepodites, nauplii) and dominant species (t-test, P < 0.05). However, no general pattern was observed, the spatial distribution depended on the examined objects. There were statistically significant seasonal differences in zooplankton abundance (Tukey-test, P < 0.05). Water residence time and water discharge were not found to be related to zooplankton abundance, but water temperature was positively correlated with microcrustacean density.

The Most Devastating Earthquake in the Pannonian Basin: 28 June 1763 Komárom

2021 ◽  
Vol 92 (2A) ◽  
pp. 1168-1180
Author(s):  
Péter Varga ◽  
Erzsébet Győri ◽  
Gábor Timár
Keyword(s):  
Spatial Distribution ◽  
Spatial Correlation ◽  
Environmental Effects ◽  
Seismic Event ◽  
Pannonian Basin ◽  
Building Damage ◽  
Danube River ◽  
Last Millennium ◽  
The Danube River

Abstract The 1763 Komárom (now Komárno, Slovakia) earthquake was the biggest historical and recorded seismic event in the Pannonian basin in the last millennium. Contemporary documents including building damage reports from the towns of Komárom, Győr, and other locations, aftershock reports, liquefaction reports, and local surveys of taxpayers’ loss in villages are presented to build all available datasets to evaluate the effects of the quake. Damage in towns was recorded in detail only at the aforementioned two locations. However, the spatial distribution of shaking intensity can be inferred over a larger area from information obtained from other sources. Distributions of secondary environmental effects, aftershocks, and village damage show interesting spatial correlation among them and indicate that the epicenter may have been west of Komárom, north of the Danube River.

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