Abstract
The Litavka River (length 56 km, watershed area 630 km2, average flow at the outlet to the Berounka River 2.57 m3 s−1) drains the historical mining, ore processing, and smelting region of Příbram. This Ag–Pb–Zn±Sb ore district (production from the thirteenth century to 1978, locally to 1980) is known for extensive heavy metal contamination. Recent contamination of the Litavka River system is mostly related to the erosion of contaminated soils and fluvial floodplains sediments, especially from a low-gradient river section located immediately below the ore district, where the fine-grained floodplain sediments are from 1.0 to 1.7 m thick. Radiocarbon accelerator mass spectrometry dating of charcoal fragments separated from one floodplain profile showed calibrated 14C age in the range AD 1220–1284 at a depth of 1.2 m below the surface, while depths of 0.4 and 0.8 m yielded ages in the range AD 1680–1939. Formation of this floodplain was related to disturbance of the river equilibrium resulting from deforestation and the influx of fine-grained material from ore processing, including historical failures of settling ponds. Fluxes of heavy metals during flood events in the Litavka River were studied 35 km downstream below the ore district. Metals are transported here mostly (more than 99% for Pb) in the form of suspended particulate matter (SPM), which at the outlet of the Litavka River contains 2,016 mg kg−1 Zn, 918 mg kg−1 Pb, and 25.5 mg kg−1 Cd on average. During a snowmelt-related minor flood event between March 25 and 29, 2006 (peak flow 36.6 m3 s−1), the river transported 2,400 tonnes of SPM during 4 days, containing 74 kg of Cd, 2,954 kg of Pb, and 5,811 kg of Zn. During larger floods (water flows above 55 m3 s−1 have occurred here 27 times during the last 77 years), the contamination is more diluted by material eroded in the floodplain along the middle and lower river course.
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Acknowledgments
All chemical sample decompositions and analyses were performed in the laboratories of the Institute of Geology AS CR, v. v. i., Prague, except for carbon analyses, which were done in the laboratories of the Czech Geological Survey in Prague. We thank M. Koželuh, B. Nekut, and L. Polya (Povodí Vltavy, State Enterprise) for valuable information and data about the Litavka River. The help of S. Sánchez de la Nieta Morote during field sampling was appreciated. Field observations on geomorphologic evolution of the Litavka River floodplain done by V. Cílek and R. Mikuláš (Institute of Geology AS CR, v. v. i., Prague) improved our understanding of the river system evolution. We thank D. W. Hardekopf for the careful reading and corrections in the final version of the manuscript. This study was performed as a part of the project IAA300130505 of Institute of Geology, AS CR, v. v. i., within research program AV0Z30130516.
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Žák, K., Rohovec, J. & Navrátil, T. Fluxes of Heavy Metals from a Highly Polluted Watershed During Flood Events: A Case Study of the Litavka River, Czech Republic. Water Air Soil Pollut 203, 343–358 (2009). https://doi.org/10.1007/s11270-009-0017-9
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DOI: https://doi.org/10.1007/s11270-009-0017-9