Author(s)

H. Lauri, H. Ylinen, J. Koponen, H. Helminen & P. Laihonen

Abstract

Combatting nutrient spillage in the Archipelago Sea—a model system for coastal management support H. Lauri% H. Ylinen*, J. Koponen*, H. Helminen* & P. Laihonen* ' Environmental Impact Assessment Centre of Finland Ltd, Finland ^ South-West Finland Regional Environment Centre, Finland Abstract The Archipelago Sea is a sea area in the Baltic Sea between Aland and the Finnish mainland strongly influenced by the Baltic Sea forcing. Archipelago Sea waters are relatively clean but threatened from the southern and eastern sides by more nutrient rich waters from the Gulf of Finland and the Baltic Proper, and also from local nutrient loads from Finnish mainland and fish farming. In order to find out the relative impact of different nutrient sources a hydrodynamic model was applied to the area. Modelling the Archipelago Sea required taking into account large scale variations of the Baltic Sea as well as the small scale topography created by the numerous islands, therefore a nested three-

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