Examination of structurally dynamic eutrophication model

An ecological modelling software, named Pamolare, for planning and management of lakes and reservoirs was developed by Jّrgensen et al., 2003 [PAMOLARE Training Package, Planning and Management of Lakes and Reservoirs: Models for Eutrophication Management, UNEP_DTIE_IETC and ILEC, 1091 Oroshimo-cho, Kusatsu, Shiga, 525-0001, Japan, 2003]. The software has four eutrophication models including application of structurally dynamic models. We tested two models in the Pamolare program using data from Lake Glumsّ, Denmark: one year for calibration, one year for validation and three years for a prognosis validation. Compared with observations, the simulations by the structurally dynamic approach yielded satisfactory results over all five years, whilst the two-layer model with trial and error approach in Pamolare did not give acceptable results. We also compared the results with that of two previously developed models, specifically designed for Lake Glumsّ. We concluded that the structurally dynamic model from Pamolare in the Lake Glumsّ case gave better results than the two-layer model included in Pamolare, and yielded equally good results as the two-eutrophication models specifically developed for Lake Glumsّ. Furthermore, the model was far less time consuming to calibrate than the three other models, due to an automatic calibration procedure.