Numerical Study of Solitary Wave Interaction with Porous Breakwaters
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 133, Issue 5
Abstract
Solitary wave interaction with porous breakwaters is studied by using a two-dimensional numerical model. In this model, flows outside of porous media are described by Reynolds-averaged Navier-Stokes equations. For porous flows, the spatially averaged Navier-Stokes equations, in which the effect of porous media is considered by including additional inertia and drag forces, are derived and implemented. The drag force is modeled according to Morison’s equation assuming uniform spherical particles within porous media. The corresponding drag force coefficient is expressed as the function of Reynolds number and hence the proposed porous flow model is valid in a wide range of porous flow regimes, i.e., laminar (linear friction), transitional, and turbulent (nonlinear friction) flows. The numerical model is validated against available theories and experimental data for both long wave and solitary wave interaction with porous breakwaters. The model is then employed to study solitary wave interaction with fully emerged rectangular porous breakwaters with different length and particle size. Based on the results, the characteristics of wave reflection, transmission and energy dissipation are discussed. Additional numerical tests are conducted to study the effects of depth of submergence and porosity of breakwaters on wave transformation. The scale effects in small scale and large scale model tests are also discussed by performing numerical experiments in the reduced and enlarged numerical wave flumes.
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Acknowledgments
The study was supported, in part, by the research grants provided by Defence Science and Technology Agency (DSTA), Singapore (No. R-347-000-021-422) and National Natural Science Foundation of China (NSFC Nos. 50525926 and 50679046).
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Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 133 • Issue 5 • September 2007
Pages: 352 - 363
Copyright
© 2007 ASCE.
History
Received: Dec 20, 2005
Accepted: May 10, 2006
Published online: Sep 1, 2007
Published in print: Sep 2007
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