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A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D

Khaled Damdam
Master thesis
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no.ntnu:inspera:43478875:46777794.pdf (68.92Mb)
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http://hdl.handle.net/11250/2621760
Utgivelsesdato
2019
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  • Institutt for bygg- og miljøteknikk [2854]
Sammendrag
 
 
Coastal zones have been a dynamic area and most favoured locations utilized for

living, leisure, recreational activities, tourism, commerce and many other human ac-

activities. Submerged and floating breakwaters have been used as effective systems to

protect these zones from wave attack. However, they are only effectively functional

if the incident wave height is relatively low. Under such condition, these systems can

reduce the wave transmission with significant wave dissipation and hence achieving

a desirable tranquillity in designated areas. Therefore, the focus of this research is

mainly to investigate the possibility of using a combination of a submerged porous

breakwater (SBW) with a floating breakwater (FBW) as an innovative coastal protection system that can provide adequate calm conditions in the coastal zones with

minimum visual impact. This study utilizes the open-source CFD model, REEF3D

to simulate such wave-structure interaction. This CFD model is based on the RANS

equations coupled with the level set method and the k − ω turbulence model

In the present study, the first section deals with the simulation of irregular wave

breaking over an irregular bed profile with the use of wave reconstruction method

to generate irregular waves. An excellent agreement between the computed results

and the experimental data is obtained showing that REEF3D model is capable of

capturing the dominant features of the evolution of the wave breaking process, both

in the shoaling region and the surf zone.

The second section deals with the simulation of regular wave interaction with the

SBW. The simulation is conducted using the VRANS method to resolve the porous

flow. The wave interaction with the SBW is validated by comparison with experimental data. An impressive agreement between the numerical results and the experimental data is achieved with very small RMSE values. Finally, the validated

model is then used to simulate the combination of the SBW and the FBW. Three

different cases are investigated with three different spacing between these structures.

For each case, five different configurations related to the geometry of the FBW are

simulated. It is found out that an effective reduction of more than 90%, on average,

of the incident wave height, can be achieved for this combined breakwaters system. This means that a transmission coefficient (Kt ) of less than 10% is calculated across

this combination. Besides, it is found out that 1.75 FBW length to wavelength (L/λ)

ratio produces a very low transmission coefficient (Kt ). Further, an effective distance

of 1-2 wavelength between the SBW and the FBW subsystems can also result in

lower transmission coefficients (Kt ).
 
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