Ship-wake induced sediment remobilization: effects and proposed management strategies for the Venice Lagoon

Rapaglia, John, Zaggia, Luca, Parnell, Kevin, Lorenzetti, Giuliano, and Vafeidis, Athanasios T. (2015) Ship-wake induced sediment remobilization: effects and proposed management strategies for the Venice Lagoon. Ocean & Coastal Management, 110. pp. 1-11.

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Abstract

More than 3000 commercial vessels navigate through the Malamocco-Marghera Industrial Canal in Venice Lagoon, Italy in a given year, leading to an estimated annual resuspension of 1.2 × 106 metric tons of sediment. Hence, ship wakes contribute to the significant erosion of shoals in the central lagoon which has occurred over the last 30 years. Drawdown associated with the surface depression wave from successive ships induces sediment transport towards the shipping canal, where the cost of dredging amounts to tens of millions of Euro per year. Most ship traffic occurs near an industrial zone, resulting in substantial potential for resuspension of contaminated sediment. Thus, sediment resuspension by ship traffic in the Venice Lagoon has the potential for detrimental economic and environmental impacts.

This paper illustrates the impacts of ship induced depression waves and discusses management options for mitigating those impacts, based on extensive observational data and analysis conducted in Venice Lagoon, Italy. This article helps to further the understanding of the processes that govern sediment transport along the shipping channel and employ this knowledge to develop specific management recommendations.

A reduction in the navigation speed of ships, an increase in the distance between successive ships, and limiting navigation to tidal levels above 0.3 m from the local 1897 reference mean sea level can help to minimize these problems.

Item ID: 37861
Item Type: Article (Research - C1)
ISSN: 1873-524X
Keywords: shipping; sediment resuspension; dredging; ports; depression waves
Funders: Future Oceans Excellence Cluster
Date Deposited: 24 Mar 2015 04:16
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040699 Physical Geography and Environmental Geoscience not elsewhere classified @ 90%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050205 Environmental Management @ 10%
SEO Codes: 88 TRANSPORT > 8802 Water Transport > 880205 Port Infrastructure and Management @ 50%
96 ENVIRONMENT > 9609 Land and Water Management > 960903 Coastal and Estuarine Water Management @ 50%
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