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5D + E - Risk communication + From risk mgnt to sust. mgnt? (MOP/188) Decision Support System and Water Quality Index in Guanabara Bay – Brazil. Dantas, Marta1, Perin, Guido1, 1 University Ca' Foscari, Venice, VE, Italy ABSTRACT- This work is part of a three year long International Cooperation Project joining Brazil and Italy managed by their cooperation institutions as the Brasilian ABC (Brasilian Agency for Cooperation), the Italian DGCS (General Direction for Cooperation to the Development) with the managing support of the IUCN (International Union for Conservation of Nature). The aim of the project is the know-how transfer in order to organize a management system of aquatic ecosystems by develping a DSS – Decision Support System. This instrument allows to face a specific problem in an integrated way and give an olistic view of the territory multiplying the possibilities of the decision power. The DSS will be developed and used in the Guanabara Bay – Rio de Janeiro State – Brazil, that is an important estuarine ecosystem, worldwide known, having a total surface of 380 Km2. This area is a fragile transition system itself, and it is in a more critical situation because of the heavy impact due to the presence of about 8 milion of people and about 6 thousand industries, almost all discharging in the Bay their untreated waste waters. An important part of this DSS is the develop of a Water Quality Index (WQI), part of the Global Environmental Index (GEI) that will based on the caracterization of three main comparts of the Bay: water, sediment, and living organisms. In the same time, being the sediment generally anoxic and therefore a pollutant trap, a study about their release from bottom sediment to the water column has been performed. It is possible indeed that a change of the bay sediment conditions could recirculate some polluntants, and this situation that could be very important in the Water Quality Index definition. Key words: water-quality Index, DSS, Guanabara |
