ANALYSIS OF THE EUTROPHICATION TREND IN A DEEP LAKE

This paper presents a model for the analysis over many years of the eutrophication trend in a lake. The phenomenon is studied through analysis of the diffusion and transport of phosphorus and phytoplankton, considering the effects produced by the hydrodynamic fields. The mass balance equations for phosphorus and phytoplankton are solved simultaneously by means of a multi-layer finite differences model: since the exchanges between phosphorus and phytoplankton are related to production, decomposition and mineralization. This model takes into consideration the effects of physical parameters such as the vertical distribution of temperature, light intensity and water turbidity. The eutrophic trend in a lake may be studied with this model, as it allows for the simulation of the concentration fields of phosphorus and phytoplankton over many years without a heavy computational burden.