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Relationship of Morpho-Sedimentological Variations to the Fate of Hg-and Zn-Polluted Sediments in the Contaminated Site of Porto Marghera,Lagoon of Venice,Italy

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Journal of Environmental Protection 2013年第4期4卷 37-49页

作者： Emanuela Molinaroli Alessandro Sarretta Jorge Ade Souza Guimaraes Margherita Botter daniele cassin Stefano Guerzoni Dipartimento di Scienze Ambientali Informatica e Statistica Universita Ca’Foscari VeneziaVeneziaItaly CNR—Consiglio Nazionale delle Ricerche ISMAR—Istituto di Scienze MarineBolognaItaly Coastal Planning&Engineering do Brasil Santo Antonio de LisboaFlorianopolisBrasil CNR—Consiglio Nazionale delle Ricerche ISMAR—Istituto di Scienze MarineVeneziaItaly CNR—Consiglio Nazionale delle Ricerche ISMAR—Istituto di Scienze MarineLesinaItaly

New data collected from twenty-six sites during 2008 inthe contaminated Site of National Interest (SIN) of Porto Marghera within the Lagoon of Venice (Italy), which has been affected by the presence of an industrial zone for the last 80 years, were compared with data from a campaign performed in the same site 30 years before (1976-1978). The SIN was found to be heavily polluted in the earlier study, and several tons of Hg and Zn are still stored in soils and industrial channel sediments, potentially affecting the lagoon part of the SIN. Bathymetric variations, grain-size, Hg and Zn content in sediments were analysed. The severe contamination of the late 1970s (Hg 1.7 μg/g;Zn 754 μg/g) had fallen by the late 2000s (Hg 0.9 μg/g;Zn 225 μg/g). The fall in Hg and Zn contamination over the 30-year period was mainly linked to the patterns of geomorphological change inside the SIN that affected two distinct sub-areas: 1) a stable-depositional (SD) area in the Northern part, which exerted a “dilution” effect on contaminants, with significant deposition (~11%) of coarse-grained sediments (63 - 8 μm), and 2) an area characterised by moderate-to-severe-erosion (MSE) to the South, which saw the loss (~13%) of pollutant-bearing fine-grained sediments (sion if hydrodynamic conditions change in the future. This study provides useful support to decision-making systems by helping to select hot-spots for remediation measures.

关键词： Lagoon of Venice Sediment Pollution Bathymetry Erosion-Sedimentation Grain-Size Management Plan

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