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Title: Análise da contaminação de rios em sistemas costeiros através de balanços de fluxos e da depreciação do capital natural: estudo de caso: sistema fluvial Iguaçu-Sarapuí, Rio de Janeiro, Brasil
Keywords: Contaminação hídrica;  Balanço de fluxos;  Depreciação do capital natural;  Baía de Guanabara (RJ);  Water contamination;  Flux balance;  Depreciation of natural capital;  Guanabara Bay (RJ)
Issue Date: 13-May-2008
Abstract: On the chance that: i) it is possible to identify sources and/ or fluvial contaminated segments, and even organize them in a hierarchical form in context already highly impacted and under tide influence; ii) and that it is possible to assess the socioeconomic losses caused by water contamination; this work aimed to characterize the fluvial water contamination of northwestern region of Guanabara Bay focusing on the depreciation of natural capital. Therefore, it was considered the potential of generating flow contaminants by segments of the river system Iguaçu-Sarapuí applying a sampling strategy that considers the holding of mass (flows) balances in a situation without, or with minimal, influence of marine water from Guanabara Bay. The depreciation of natural capital was estimated comparing the contaminant fluxes with control area s fluxes. Sampling was conducted at dry season (July), during low tide, in four stations at Iguaçu River and in one station at the mouth of the Sarapuí River (P-4). The first station at Iguaçu River (P-0) was considered as control area, since it is the river s source and it is located at a protection area called Reserva Biológica do Tinguá . Stations 1, 2 and 3 were located at middle-course of Iguaçu River and station 5, at Iguaçu-Sarapuí system s mouth. The major contribution of contaminants for this fluvial system (both for toxic metals and BOD) is originated at station 4. Since Sarapuí River receives mainly effluent discharges from urban areas and that it was not observed a positive gradient among stations 1 and 3 (downstream of REDUC discharges), one could suggest that the source of these contaminants would be basically domestic wastes. Evaluating the actual contamination scenario of BOD in the system, it was estimated a depreciation of natural capital of approximately US$ 740x106.
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