An Eutrophication Model For A Lowland
River-lake System
Author(s)
A. Gnauck & B. Luther
Abstract
Natural and man induced nutrient loads affect the functioning of freshwater
ecosystems and restrict various water uses. In particular, internal pollution by
nutrient remobilisation from sediment plays an important role in shallow water
bodies. A sustainable management of such freshwater ecosystems can be
achieved by using simulation models. To forecast the eutrophication process of a
shallow river-lake system a modelling and simulation framework was developed
including phosphorus remobilisation from sediment. Data are taken from the
Lower Havel River. For water quality management decision control strategies
based on the limiting nutrient concept and threshold values of LAWA are
discussed.
Keywords: eutrophication, water quality, modelling, phosphorus remobilisation,
optimisation.
1 Introduction
Eutrophication of freshwater bodies is characterised by an increase of dissolved
nutrients in water bodies, mainly phosphorus, carbon and nitrogen, by excessive
growth of plants, mainly algae, and by restricted water uses due to anoxic water
conditions as well as by odour problems [1,2]. The eutrophication process of
freshwater ecosystems is supported by intensive man-made activities in river
basins. Man-made impacts caused a shift from oligotrophic to eutrophic and
sometimes to hypertrophic freshwater ecosystems. Now it has become clear, that
sediments have been accumulating phosphorus over several decades so that they
now function as internal phosphorus sources [3]. Compared with the amount of
phosphorus in the pelagic zone of eutrophic lakes, the phosphorus content of the
sediment of shallow water bodies is considerable higher.
Keywords
eutrophication, water quality, modelling, phosphorus remobilisation,
optimisation.
Related Book
Other papers in this volume
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