Anthropogenic impact on selected oxbow lakes in the Elbe river floodplain
2007
Chalupová, D., Charles University in Prague (Czech Republic). Department of Physical Geography and Geoecology | Janský, B., Charles University in Prague (Czech Republic). Department of Physical Geography and Geoecology
From the year 2000, the environmental state and the impact of human activities on fluvial lakes in the central part of the Czech section of the Elbe River is evaluated. For that reason, three oxbow lakes were chosen: Lake Labiště pod Opočínkem (east of Pardubice), Lake Doleháj (near Kolín), and Lake Obříství (near Mělník). All of them are situated within an area with a well-developed chemical industry and the nearby lowlands are one of the most intensively farmed areas of the Czech Republic. In spite of the identical origin during the river canalization, major differences were found. E.g. very low oxygen saturation in Opočínek (mean saturation 46%) was determined. Nutrient concentrations and their seasonal dynamics (nitrites, nitrates, ammoniated ions, and phosphates) differed in each lake as well. The lowest concentrations of heavy metals (Ag, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb and Zn) in sediment were found in the Doleháj. In samples from Obříství after a big flood in September 2002, the Index of Geoaccumulation increased only for Pb and decreased for Hg. This result indicated that the pollution has probably not been occurred during such floods.
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