PCLAKE - A MODELING TOOL FOR THE EVALUATION OF LAKE RESTORATION SCENARIOS

The response of various water quality parameters on nutrient load redu ction in shallow lakes is often nonlinear, because of the many differe nt ecological interactions involved. In order to get insight into this , a mathematical model is presented combining a description of the int ernal nutrient cycles with a food-web approach. Different applications of the model are discussed: combined calibration on a multi-lake data set, and a study on the effects of increasing vs. decreasing loading on the water quality in an ''average shallow lake''. The model has als o been used to evaluate different restoration scenarios in several lak es in The Netherlands.