Impact of erosion-transported overburden dump materials on water quality in Lake Cospuden evolved from a former open cast lignite mine south of Leipzig, Germany |
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Authors: | A Abel A Michael A Zartl F Werner |
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Institution: | (1) Dresden Groundwater Research Centre, Meraner Strasse 10, D-01217 Dresden, Germany, e-mail: aabel@dgfz.de, Fax: +351 4050669, DE;(2) Freiberg University of Mining and Technology, Faculty of Geosciences and Mining, Institute of Soil and Water Conservation, Agricolastrasse 22, D-09599 Freiberg, Germany, DE;(3) University of Agricultural Sciences, Department of Hydraulics and Rural Water Management, Munthgasse 18, A-1190 Vienna, Austria, AT |
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Abstract: | Acidification is the most common water quality problem in lakes created from previous open cast lignite mines. Aeration of
aquifers and dump materials from mining activities causes pyrite oxidation. Pyrite oxidation products are stored in pore water,
minerals and at the exchange complexes of the aquifers and dump sediments. Rainfall runoff transports sediments on the dump
slope into the lakes. Elutriation of these sediments whithin the lakes releases either acid-producing or acid-neutralizing
agents. At a test site south of Leipzig, the annual erosion rates were quantified by water erosion models (RUSLE, EROSION
2D, PEPP) and field measurements. They ranged from 300 up to 900 tons per hectare. Hydrogen ion equivalent release or binding
at the sediment elutriation was computed from laboratory analysis of the pore-water quality, ion exchange complex and mineral
composition of the sediment. Two of the three investigated sediments contained 3 mmol (eq) acidity per 100 g dry sediment
and revealed saturation with respect to jarosite, jurbanite and gypsum. In the third sediment, 6 mmol (eq) alkalinity per
100 g dry sediment was obtained. The annual net acidity influx was calculated to be about 0.5 million mol (eq) for the lake
of the test site.
Received: 2 November 1998 · Accepted: 26 January 1999 |
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Keywords: | Geomorphology Soil chemistry Hydrochemical modelling Lignite mines |
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