Breaking Limit, Breaking and Post-Breaking Wave Deformation Due to Submerged Structures

Iwata, Koichiro; Kawasaki, Koji; Kim, Do-Sam

doi:10.1061/9780784402429.181

Cited by 8 publications

(9 citation statements)

References 7 publications

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“…In addition, the downstream vortex size becomes larger as the water depth over the reef crest is increased. This is consistent with those of Iwata et al (1996), Ting and Kim (1994), and Chang et al (2005) who reported the return flow due to the vortex formation behind the submerged structures. Hence, the numerical model is able to capture the complex interface changes and flow features during breaking process with reasonable accuracy.…”

Section: Waves Breaking Over the Reefsupporting

confidence: 94%

“…They suggested that the application of the surf similarity parameter proposed by Battjes (1974) is inappropriate to categorize the breaker type of waves breaking over submerged structures. Several studies on submerged breakwaters have revealed the role of the water depth at the reef crest and the offshore wave height on the wave transformation properties (Ahrens, 1987;Iwata et al, 1996;Kawasaki and Iwata, 1998;Ting and Kim, 1994). Hence, the wave breaking process over a submerged reef with a fixed crest height is very sensitive to the water depth and the wave height at the crest.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and profile asymmetry properties of waves breaking over an impermeable submerged reef

Chella

Bihs

Myrhaug

2015

Coastal Engineering

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In the present study, a 3D two-phase flow CFD model that solves the unsteady, incompressible ReynoldsAveraged Navier-Stokes equations has been used to simulate breaking waves over an impermeable submerged reef. The level set method is used to capture the complex free surface and the turbulence is described by the k − ω turbulence model. The numerical model was evaluated by comparing the computed results with the experimental data by Blenkinsopp and Chaplin (2008) and the computed results are in good agreement with the measured data. The computed results over the submerged reef clearly depict the flow features associated with the breaking process such as the complex interface deformation, the formation of the plunger vortex and the downstream vortex, the splash-up phenomenon and the movement of the enclosed air pocket. The main aim of the study was to investigate the effect of the offshore wave steepness and the water depth above the reef crest on the characteristics and the profile asymmetric properties of waves breaking over a submerged reef. The computed results suggest that the water depth over the reef crest affects the prominent characteristics of waves breaking over a reef such as breaker type, water depth at breaking, breaker indices and geometric properties.

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Section: Waves Breaking Over the Reefsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Characteristics and profile asymmetry properties of waves breaking over an impermeable submerged reef

Chella

Bihs

Myrhaug

2015

Coastal Engineering

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“…The SKYLLA model (Vander Meer et al (1992), Van Gent et al (1994), Van Gent (1995) was developed at Delft Hydraulics and has been applied to flows on impermeable slopes and permeable structures (Doorn and Van Gent, 2004). Iwata et al (1996) used a modified SOLA-VOF model for numerical comparison with experimental data from breaking and post-breaking wave deformation due to submerged impermeable structures. Waves were generated internally in the computational domain using a source generation technique (Brorsen and Larsen 1987).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of combined overflow and wave overtopping over a smooth impermeable seawall

Reeve

Soliman

Lin

2008

Coastal Engineering

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“…However, wave breaking, induced by the presence of the structure, can be considered as the most significant energy dissipation mechanism. Breaking is located upon or at the toe of the breakwater (Iwata et al, 1996;Tsutsui and Zamani, 1993). the reflection coefficient is increased.…”

Section: Introductionmentioning

confidence: 99%

Modelling wave deformation due to submerged breakwaters

Kriezi¹,

Karambas²

2010

Proceedings of the Institution of Civil Engineers - Maritime En

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The present paper presents an experimental and numerical study of partial wave reflection and transmission for monolithic rectangular submerged breakwaters located in the nearshore region. The study is based on large-scale experiments that have been conducted in Universitat Politecnica de Catalunya, Laboratory de Ingeneria Maritima in Spain. Both irregular and regular waves are tested under breaking and non-breaking conditions. The experimental findings confirmed that the wave breaking due to the presence of the structure is a main energy dissipation mechanism which significantly affects wave transmission. The numerical approach of the problem is based on a higher-order Boussinesq type of equations for breaking and non-breaking waves with improved linear dispersion characteristics. The energy loss due to eddy motions near the sharp corners of the structure is introduced in the model by using a hydraulic loss formula. The breaking criterion proposed by Okamoto and Basco was introduced in the numerical model. The comparison between model results and experimental data shows that the model is able to describe breaking and non-breaking wave deformation passing over a submerged breakwaterwater depth d + depth immediately downstream (or upstream) of the structure E incident incident wave energy E reflected reflected wave energy E transmitted transmitted wave energy F submerged depth f friction coefficient H ins incident wave height H rms root-mean-square wave height L wave length m c computational slope T wave period

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Breaking Limit, Breaking and Post-Breaking Wave Deformation Due to Submerged Structures

Cited by 8 publications

References 7 publications

Characteristics and profile asymmetry properties of waves breaking over an impermeable submerged reef

Characteristics and profile asymmetry properties of waves breaking over an impermeable submerged reef

Numerical study of combined overflow and wave overtopping over a smooth impermeable seawall

Modelling wave deformation due to submerged breakwaters

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