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In this section, after an introductive description of the phenomenology characteristic of eutrophic lakes, lake eutrophication modelling is referred to its historical starting point, i.e. the mixed reactor approximation. This approximation introduces such factors as water renewal, lake sediment interaction and thermal stratification, which lead to a more detailed and basic analysis of lake eutrophication. The second part relates to the present level of lake eutrophication modelling, as founded on a general conservation (or continuity) equation for the space and time dependent concentration of a substance dispersed in the water body. From this equation, the general equation of a one-dimensional (z,t) model is formally derived, then a discretisation of the z-variable leads to the vertical box approximation. A simplified sediment model, to be associated with the lake box model, is also presented and briefly discussed. After a discussion of the bio-chemical processes and the problems of parameter evaluation and model calibration, modelling of the future evolution of a eutrophic lake is considered in relation to common restoration interventions.

Additional information

Authors: ROSSI G E, JRC Ispra (IT)
Bibliographic Reference: Article: Encyclopedia of Fluid Mechanics, Vol.10 (1990) No.9, pp. 327-369
Record Number: 199011064 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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