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Hydrogeochemistry of two River Main Floodplain Lakes, Hessia, FR Germany

W.L.F. Brinkmann, H. Hahn and H. Schick
GeoJournal
Vol. 14, No. 3, Shallow Lakes Environment (April 1987), pp. 331-338
Published by: Springer
Stable URL: http://www.jstor.org/stable/41143897
Page Count: 8
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Hydrogeochemistry of two River Main Floodplain Lakes, Hessia, FR Germany
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Abstract

Two lakes, Lake Gänseweiher (LGW) and Lake Fechenheimer Weiher (LFW) occupy groundwater filled abandoned gravel pits which serve as fishing grounds and are part of recreational areas, respectively. Both lakes are cut into a near-surface groundwater aquifer, which is located in the pleistocene River Main gravel terrace tg. They are sealed at the base by miocène clays and above by overlying flood deposits of the River Main. The latter provide protection from pollutants derived from wet and dry deposition of atmospheric contaminants. Groundwater chemistry determines the pool of dissolved constituents in lake water. The temporal and spatial distribution patterns of chemical compounds in lake water are brought about by endo-biogenic processes, of which the indicators are nitrate-nitrogen and dissolved silica. The latter illustrates an instantaneous response to pulses of diatom blooms. Both lakes are eutrophic (polytrophic) according to the classification guidelines presented in literature.

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