http://www.cnr.it/ontology/cnr/individuo/prodotto/ID217470
Characteristics of ships' depression waves and associated sediment resuspension in Venice Lagoon, Italy (Articolo in rivista)
- Type
- Label
- Characteristics of ships' depression waves and associated sediment resuspension in Venice Lagoon, Italy (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.jmarsys.2010.11.005 (literal)
- Alternative label
John Rapaglia (1), Luca Zaggia (2), Klaus Ricklefs (3), Morgan Gelinas (1), Henry Bokuniewicz (4) (2011)
Characteristics of ships' depression waves and associated sediment resuspension in Venice Lagoon, Italy
in Journal of marine systems
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- John Rapaglia (1), Luca Zaggia (2), Klaus Ricklefs (3), Morgan Gelinas (1), Henry Bokuniewicz (4) (literal)
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- Pagina fine
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- Rivista
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- (1) Institute of Geography, Cluster of Excellence 'The Future Ocean', Christian-Albrechts University, Ludewig-Meyn Strasse 14, Kiel 24118 Germany
(2) National Research Council of Italy, Institute of Marine Science (CNR-ISMAR), Castello 1364/a, Venice 30122, Italy
(3) West Coast Research and Technology Center of Kiel University Hafentoern 1 Buesum 25761, Germany
(4) School of Marine and Atmospheric Sciences, Stony Brook University, NY 11794-5000, United States (literal)
- Titolo
- Characteristics of ships' depression waves and associated sediment resuspension in Venice Lagoon, Italy (literal)
- Abstract
- The character of ships' wakes and the consequent sediment resuspension induced by the passage of
commercial vessels in Venice Lagoon, Italy was investigated during July, 2009. Suspended sediment
concentration (SSC), water depth, and water velocity were measured on the shoals alongside the shipping
channel after the passage of forty vessels. The ships' passage produced large waves of depression with troughs
oriented at an average angle of 44° to the channel. High water velocities are recorded opposite the direction of
wave propagation and may exceed 2 m s-1 at the rear edge of the trough. Ten vessel-induced wakes led to
SSC concentrations above 400 mg L-1, ~30 times higher than the average background concentration. When
large wakes passed over the shoals, maximum concentrations persisted for several minutes and elevated
concentrations persisted for nearly an hour. The height of a ship's wake can be related to the product of the
depth-based Froude number, Fr, and a blocking coefficient, S, according to Fr3.5S1.6. Because of the sensitivity
of the height of the wake to the ship's speed, we suggest a method for calculation of a ship-by-ship velocity
threshold below which shear stress does not exceed the critical erosive stress level for sediments. (literal)
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