Analysis of the performance of pontoon-type floating breakwaters

Moghim, Mohammad Navid; Botshekan, Meshkat

doi:10.1080/1023697x.2016.1262292

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Pontoons can be regarded as the most common and simple types of floating breakwater which have gained much interests in the literature. Single pontoon type of floating breakwater has been studied by many researchers [3][4][5][6], each of these investigations had devoted to the efficiency of the structure in respects to hydrodynamic coefficients, motion response and mooring force. Many recent researches have been for twin pontoons of floating breakwater (TPFB) such as cage floating breakwater [7,8] and cylindrical floating breakwater [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Optimized modelling on lateral separation of twin pontoon-net floating breakwater

Fitriadhy¹,

Abdullah²,

Hairil³

et al. 2019

JMES

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Since the attribute of wave energy transmission is susceptible to lateral separation (S/D) between twin pontoons of floating breakwater (TPFB), arbitrarily selection of S/D may present problems in the evaluations on the effectiveness of the structure. This paper presents a numerical optimization modelling aimed at obtaining the optimum S/D through Genetic Algorithm (GA) approach. The artificial intelligence is primarily employed to minimize transmission of wave energy coefficients ( ) whereas maximize energy dissipation coefficient ( ). To achieve such demand, a numerical simulation implementing a MATLAB code as an interface between the Genetic Algorithm and a CFD program is applied. Several parameters for the effects of various wavelengths and ratios of S/D including a set of criteria have been considered in the simulation, where the optimum solution is chosen from various populations. The results demonstrated that the current GA analysis is efficient that can search a global trade-off between and to determine an optimum S/D ratio. For S/D equal to 2.72, minimized to less than 0.3 as compared to existing model ( > 0.5) while maximized to greater than 0.95 resulting to optimum hydrodynamic effects of TPFB. Hence, the optimization algorithm can serve as a useful engineering tool for a conceptual design to determine an optimum S/D for twin pontoon floating breakwater.

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Section: Introductionmentioning

confidence: 99%

Optimized modelling on lateral separation of twin pontoon-net floating breakwater

Fitriadhy¹,

Abdullah²,

Hairil³

et al. 2019

JMES

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“…Some specific research in this type of breakwater involve several parametric studies that is devoted to the stability and performance of structures under various loading conditions [4][5][6]. Several researchers had conducted numerous approaches in order to analyse the hydrodynamic performance of floating breakwater of moored pontoon type breakwater [7][8][9], inclined moored submerged floating breakwater [10] and porous floating breakwater [11]. Despite numerous research and promising results by many authors, unsatisfactory wave attenuating effect of floating breakwater in long waves has remain a topic of studies by many researchers [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis of cylindrical floating breakwater towards reduction of sediment transport

Fitriadhy¹,

Faiz²,

Abdullah³

2017

J. MECH. ENG. SCI.

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Floating breakwater becomes an alternative and reliable coastal area protection as it is cheaper in production cost as compared to conventional bottom-fixed breakwater. Floating breakwater system would be the best decision in order to control sedimentation that threatens the shore due to erosion. This study proposes to analyse Cylindrical Floating Breakwater (CFB) aimed at gaining a sufficient reduction in the sediment transport rate along the shore (case study at Tok Jembal Beach in Kuala Terengganu) by using CFD approach. Several parameters for the effects of wavelengths and vertical clearance between the CFB and seabed on the gradient of suspended and packed sediment were simulated by using Flow3D. A wave boundary was assigned to give an insight on regular waves effects to the parameters used in the simulation. The results showed that the presence of CFB markedly reduced the concentration and mass of suspended sand, gravel and coarse gravel for the whole range of wavelengths considered. Besides, it was found that varying the relative clearance of the floating breakwater and seabed was particularly sensitive to the concentration and mass of suspended sediment. Meanwhile, the bulk of sediment mass and concentration remain insignificant for the investigated wavelength and vertical clearance. From this standpoint, the cylindrical floating breakwater (CFB) could significantly minimise the gradient of sediment transport along the breakwater-beach distance while its installation depth may be optimised for circumstances to save cost, avoid breaking waves and morphological changes, ship traffic routes and etc.

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