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Modelling the reciprocal water exchange between a river (Havel) and a lake (Tegeler See) during spring and autumn overturns
Author(s) -
Lindenschmidt KarlErich,
Fröhlich Martin
Publication year - 2000
Publication title -
lakes and reservoirs: research and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.296
H-Index - 39
eISSN - 1440-1770
pISSN - 1320-5331
DOI - 10.1046/j.1440-1770.2000.00109.x
Subject(s) - inflow , volume (thermodynamics) , hydrology (agriculture) , flow (mathematics) , dispersion (optics) , finite volume method , environmental science , phosphorus , discretization , water quality , control volume , mechanics , geology , chemistry , thermodynamics , mathematics , physics , geotechnical engineering , ecology , mathematical analysis , organic chemistry , biology , optics
Abstract A finite volume computer model (current flow and transport) was used to simulate the reciprocal water exchange between a river (Havel) and a lake (Tegeler See) appendaged to the river in Berlin, Germany. The discretization of the model control volume is 2‐D along the plane of the water surface, which restricts the modelling to time periods of complete overturn. The finite volume method does, however, allow a depth to be given for each volume cell. A k ‐ε turbulence submodel was integrated into the model to calculate the distinct dispersion coefficients for each volume cell. As current flow measurements were unavailable, the model was verified indirectly by the transport simulation of dissolved chloride, a conservative substance. The results show that the Havel contributes up to 30% of the total inflow to Tegeler See when it is overturned. As the Havel is more heavily polluted with respect to phosphorus loading, this has negative implications to the water quality of Tegeler See. Suggestions are given for controlling the Havel inflow amount by increasing the output of the phosphate elimination facility, the second main inflow to Tegeler See. Its output has very low phosphorus concentrations and serves as a flushing function.