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A Water Quality Simulation Model for a Lowland River-lake System

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Masaryk University Brno


Polluted water affects not only the functioning of freshwater ecosystems and various water uses, but risks human health. One of the long-term environmental problems of freshwater ecosystem management is the control of eutrophication. It is characterised by an intensive increase of dissolved nutrients in water bodies, by excessive growth of plants, mainly algae, and by restricted water uses due to anoxic water conditions as well as by odour problems. It refers to intensive man-made activities in the river catchment. The simulation framework presented consists of a combination of the MATLAB based simulation models SpreeMod and HavelMod. The simulator SpreeMod describes water quality changes along a river stretch while the simulator HavelMod covers water quality changes in shallow riverine lakes. Both simulators are coupled by interfaces which switch the model type from river to lake and vice versa. This simulation framework covers not only a long distance but also different types of freshwater ecosystems with changing dynamic water quality behaviour. Model state variables are phytoplankton, zooplankton, orthophosphate phosphorus, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, dissolved oxygen and biological oxygen demand. External driving forces are photoperiod, solar radiation and water temperature. For simulation input sampled raw data are treated by interpolation methods to generate equidistant data. In this paper simulation results of the lowland river-lake system formed by the rivers Spree and Havel close to the Berlin/Potsdam region are discussed.


Luther, Bernhard; Gnauck, Albrecht; Meisch-Peschew, Alexander (2005): A Water Quality Simulation Model for a Lowland River-lake System. Informatics for Environmental Protection - Networking Environmental Information. Brno: Masaryk University Brno. Modelling, simulation and computing. Brno. 2005