Models for Lake Eutrophication

Eutrophication is the answer of an ecosystem on increased nutrient loading. In the case of lake ecosystems it can threaten the ability of the lake for recreation or for using its water as drinking water. For meliorating the water quality the first step is the understanding the system to be modelled, the second step is forecasting its future in different nutrient loading conditions, revealing the response of the lake on certain measures. The first goal needs detailed models, large amount of state variables and processes, etc. while for fulfilling the second goal far simpler models are needed. At present the majority of models are deterministic, here one possible way of constructing stochastic model and its adventage is discussed.