Numerical simulation of the propagation of ship-induced Riemann waves of depression into the Venice Lagoon

Rodin, Artem, Soomere, Tarmo, Parnell, Kevin E., and Zaggia, Luca (2015) Numerical simulation of the propagation of ship-induced Riemann waves of depression into the Venice Lagoon. Proceedings of the Estonian Academy of Sciences, 64 (1). pp. 22-35.

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Abstract

Large in situ measured ship-induced depression waves (Bernoulli wakes) in the Malamocco–Marghera industrial channel of the Venice Lagoon are interpreted as long-living strongly nonlinear Riemann (simple) waves of depression. The properties of these depressions are numerically replicated using nonlinear shallow water theory and the CLAWPACK software. The further behaviour of measured depressions is analysed by means of replicating the vessel-induced disturbances with the propagation of initially smooth free waves. It is demonstrated that vessel-driven depressions of substantial height (> 0.3 m) often propagate for more than 1 km from the navigation channel into areas of the lagoon of approximately 2 m water depth. As a depression wave propagates into the lagoon, its front slope becomes gradually less steep, but the rear slope preserves an extremely steep bore-like appearance and the amplitude becomes almost independent of the initial properties of the disturbance. Analysis suggests that even modest ships in terms of their size, sailing speed, and blocking coefficient may generate deep depressions that travel as compact and steep entities resembling asymmetric solitary waves over substantial distances into shallow water adjacent to navigation channels. Their impact may substantially increase the environmental impact of ship wakes in this and similar water bodies.

Item ID: 37676
Item Type: Article (Research - C1)
ISSN: 1736-7530
Keywords: vessel wakes, nonlinear waves, shallow-water waves, Riemann wave, bore formation, Venice Lagoon
Additional Information:

Article is freely available to download from the publishers website via the link provided.

Funders: Estonian Science Foundation (ESF), Estonian Ministry of Education and Research (EMER), European Regional Development Fund, Centre of Excellence in Non Linear Studies (CENS), CNR-ISMAR
Projects and Grants: ESF Grant No. 9125, EMER grant SF0140007s11, EMER grant IUT33-3, CNR-ISMAR Ritmare SP3-WP3-A1
Date Deposited: 25 Mar 2015 00:19
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040699 Physical Geography and Environmental Geoscience not elsewhere classified @ 100%
SEO Codes: 88 TRANSPORT > 8898 Environmentally Sustainable Transport > 889899 Environmentally Sustainable Transport not elsewhere classified @ 60%
96 ENVIRONMENT > 9609 Land and Water Management > 960903 Coastal and Estuarine Water Management @ 40%
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