Hydrodynamic efficiency of suspended horizontal rows of half pipes used as a new type breakwater

Koraim, A.S.

doi:10.1016/j.oceaneng.2013.02.008

Cited by 36 publications

(16 citation statements)

References 24 publications

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“…As no vegetation was used in those experiments, C root , and C stem are both equal to 1. Overall, our formula predicts the measured C t fairly well, especially in the cases of Neelamani and Reddy (1992), Neelamani and Gayathri (2006), and Koraim (2013), except for some of the cases in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 16 Neelamani and Reddy (1992). The proposed empirical formula is based on 244 C t values in the range of 0.148 to 0.937.…”

Section: Empirical Formula For Wave Transmissionmentioning

confidence: 59%

“…Fig. 9 shows the predicted C t in 49 cases versus the measured C t in Patarapanich and Cheong (1989), Neelamani and Reddy (1992), Neelamani and Gayathri (2006) and Koraim (2013). The submergence of the surface platform was slightly different in different experiments.…”

Section: Empirical Formula For Wave Transmissionmentioning

confidence: 99%

“…Floating plate is a classical type of free surface breakwater, which has proved useful in reducing wave transmission (e.g. Patarapanich and Cheong, 1989;Neelamani and Reddy, 1992;Neelamani and Gayathri, 2006;Dong et al, 2008;Zidan et al, 2012;Koraim, 2013;Acanal et al, 2013). To have sufficient wave height reduction by a floating plate-type breakwater, the structure is usually designed to be a long thin plate or a large box.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulations of wave propagation over a vegetated platform

Chen

Jin

et al. 2016

Coastal Engineering

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Vegetated platforms have been constructed in recent years for the purpose of shore protection. This paper addresses some fundamental questions concerning the vegetated platform: (1) What is the difference in wave attenuation between a vegetated platform and a simple platform, and how much can vegetation increase the efficiency of reducing wave transmission? (2) Are there any differences between the effects of stems and roots on wave attenuation? (3) Does vegetation always reduce wave transmission? (4) Is it possible to develop an empirical formula for estimating the wave transmission of a vegetated platform? To answer the above questions, a numerical model solving the Navier-Stokes equations for wave propagation over a vegetated platform is established and validated by several existing laboratory experiments. A total of 244 numerical experiments based on this model have been carried out. The simulated results suggest that the platform plays a major role and the vegetation plays a supporting role in reducing wave transmission except for some special cases. Stems tend to have a larger influence than roots in reducing wave transmission with the same height. The roots always help reduce wave transmission, while the stems may increase wave transmission when the platform width is in the range of 37.5-62.5% of the incident wavelength. Based on our numerical experiments and existing laboratory data, the paper proposes a simple formula for predicting the wave transmission coefficient of a vegetated platform for engineering applications.

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Section: Empirical Formula For Wave Transmissionmentioning

confidence: 59%

Section: Empirical Formula For Wave Transmissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical simulations of wave propagation over a vegetated platform

Chen

Jin

et al. 2016

Coastal Engineering

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“…The conclusion showed that in the case of single surface-piercing membrane, with the increase in the length of the membrane and the tension of the membrane the wave reflection increases and the presence of multiple floating breakwater helps in the reduction of wave height in the transmitted region. Koraim (2013) conducted study on a new type of breakwater which consisted of one or more horizontal rows of half pipes suspended on supporting piles. With the number of rows increasing, the efficiency of breakwaters increases.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a new type of floating breakwater

Chen

Cui

et al. 2015

Ocean Engineering

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A new type of floating breakwater (FB) is proposed in this paper. Its hydrodynamic performance has been tested. The structure of the new breakwater named cylindrical floating breakwater (CFB) consists of two parts: a main body of rigid cylinders, and a flexible mesh cage containing a number of suspending balls that are intended to absorb the wave energy into their mechanical energy. A series of experiments were carried out on the new floating breakwater and traditional double pontoons and box floating breakwaters to compare their performances. A two-dimensional wave flume was used in the experiment; the incident and transmitted waves, the tensions on the mooring lines and the motion responses of the floating breakwaters were measured. Results showed that the new floating breakwater had a better performance than the traditional double pontoons and the box floating breakwaters: wave transmission was significantly reduced by the mesh cage with the balls, especially for long waves

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“…The wave suppression ability of these breakwaters primarily depends on the surface area coverage and the configurations. Floating breakwaters that are made of a single or multiple plates are widely studied by researchers due to their simplicity in design and cost effectiveness [8,9,10]. The plate-type floating breakwater can also be used to retard the current velocity by attachment of polyethylene nets at close intervals beneath the plate [11].…”

Section: Introductionmentioning

confidence: 99%

Hydraulic investigation of the H-type floating breakwater

Teh

John

Hashim

2014

Oceans 2014 - Taipei

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Floating breakwaters are commonly used for wave protection of onshore and offshore facilities in the last decade. The majority of the floating breakwaters developed in the past are solid-type structures that have fixed drafts and may be highly reflective to the incoming waves. In this study, the H-type floating breakwater is proposed to serve as a wave attenuator instead of a wave reflector. The buoyancy of the breakwater is controlled by the placement of sandbags in the chamber embedded within the main body of the structure. The study aims to investigate the hydraulic properties of the H-type floating breakwater in random waves via a physical modeling. The hydraulic characteristics of the breakwater are quantified by the reflection and transmission coefficients as well as the energy dissipation coefficient. The experimental results have shown that the H-type floating breakwater is hydraulically efficient and provides high wave attenuation capability when subjected to short-period waves.

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Hydrodynamic efficiency of suspended horizontal rows of half pipes used as a new type breakwater

Cited by 36 publications

References 24 publications

Numerical simulations of wave propagation over a vegetated platform

Numerical simulations of wave propagation over a vegetated platform

Experimental study of a new type of floating breakwater

Hydraulic investigation of the H-type floating breakwater

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