We demonstrate that ships of moderate size, sailing at low depth Froude numbers (0.37-0.5) in a navigation channel surrounded by shallow banks, produce depressions with depths up to 2.5 m. These depressions (Bernoulli wakes) propagate as long-living strongly nonlinear solitary Riemann waves of depression substantial distances into Venice Lagoon. They gradually become strongly asymmetric with the rear of the depression becoming extremely steep, similar to a bore. As they are dynamically similar, air pressure fluctuations moving over variable-depth coastal areas could generate meteorological tsunamis with a leading depression wave followed by a devastating bore-like feature.

Ship-induced solitary Riemann waves of depression in Venice Lagoon

SCARPA, GIAN MARCO
2015-01-01

Abstract

We demonstrate that ships of moderate size, sailing at low depth Froude numbers (0.37-0.5) in a navigation channel surrounded by shallow banks, produce depressions with depths up to 2.5 m. These depressions (Bernoulli wakes) propagate as long-living strongly nonlinear solitary Riemann waves of depression substantial distances into Venice Lagoon. They gradually become strongly asymmetric with the rear of the depression becoming extremely steep, similar to a bore. As they are dynamically similar, air pressure fluctuations moving over variable-depth coastal areas could generate meteorological tsunamis with a leading depression wave followed by a devastating bore-like feature.
2015
379
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/3683536
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