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Topographically controlled, breaking-wave-induced macrovortices. Part 1. Widely separated breakwaters

Published online by Cambridge University Press:  12 May 2004

M. BROCCHINI ,
A. KENNEDY ,
L. SOLDINI  and
A. MANCINELLI
M. BROCCHINI
Affiliation:
D.I.Am., Università di Genova, 16145 Genova, Italy
A. KENNEDY
Affiliation:
Department of Civil & Coastal Engineering, University of Florida, Gainesville, FL 32611-6590, USA
L. SOLDINI
Affiliation:
Istituto di Idraulica, Università Politecnica delle Marche, 60131 Ancona, Italy
A. MANCINELLI
Affiliation:
Istituto di Idraulica, Università Politecnica delle Marche, 60131 Ancona, Italy
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Abstract

In this and the companion paper (Part 2) we examine experimentally, computationally, and analytically the behaviour of breaking-wave-induced macrovortices during startup conditions. Widely separated breakwaters and rip current topographies are chosen as opposite ends of the parameter space. Part 1 examines generation mechanisms using phase-resolving and phase-averaged approximations, and suggests several simple predictive relations for general behaviour. Vortex trajectories and shedding periods for wave breaking on widely spaced breakwaters are also considered in detail. Results show broad agreement with theoretical trajectories. Predictions of vortex shedding periods on breakwater heads show excellent agreement with computations. Part 2 examines startup macrovortices on rip current topographies using computations and laboratory experiments, and changes in behaviour as the system transitions from wide to narrow gap width.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 507 , 25 May 2004 , pp. 289 - 307
Copyright
© 2004 Cambridge University Press

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