title: Hydrodynamic and nutrient modeling in a Mediterranean coastal lagoon.
abstract: The USEPA WASP5 modeling system was applied to simulate and evaluate the relationships between external and internal nutrient loadings and water quality of Vistonis lagoon, North Greece for a 2-year time period. The hydrodynamic model DYNHYD5 was calibrated to estimate daily lagoon water level. The water quality models TOXI5 and EUTRO5 were calibrated and verified using meteorological data from a station near the lagoon, and field data (salinity, dissolved oxygen, nutrients and chlorophyll-a concentrations) from seven stations located in the lagoon, for the time period April 1998 to May 1999. Predicted by the model salinity, dissolved oxygen, total phosphorus, total inorganic nitrogen and chlorophyll-a were plotted against observed values and showed good agreement. Model performance was evaluated using scattergrams of predicted versus observed values and the Kolmogorov-Smirnov two-sample goodness-of-fit test at p < 0.05. Sediment sources of nitrogen and phosphorus were important to achieve a successful model calibration. The validated model was also used to test the effectiveness of alternative management scenarios in relation to improvement of the trophic state of the lagoon.
authors.affiliation: Department of Environmental Engineering, School of Engineering, Democritus University of Thrace, Xanthi, Greece.
authors.forename: Georgios D
authors.initials: GD
authors.lastname: Gikas
authors.forename: Trisevgeni
authors.initials: T
authors.lastname: Yiannakopoulou
authors.forename: Vassilios A
authors.initials: VA
authors.lastname: Tsihrintzis
mesh_terms: D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D019015:Geologic Sediments / Q000032:analysis*; D006115:Greece; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D054712:Salinity; D012623:Seawater / Q000737:chemistry*; D018709:Statistics, Nonparametric; D014872:Water Movements
chemical_list: D002734:Chlorophyll; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen; D000077194:Chlorophyll A