Hydrodynamic analysis of a skirt breakwater

Koutandos, E. V.

doi:10.1680/maen.2007.160.3.121

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Wave dissipation coefficient, CL, is an index to reveal the hydraulic efficiency of breakwaters [25]. It is derived based on the energy conservation law (CT 2 + CR 2 + CL 2 = 1) [19,21,24,[26][27][28]. The wave energy dissipation is mainly caused by either wave breaking or flow percolation [29].…”

Section: Wave Energy Lossmentioning

confidence: 99%

Performance Characteristics of a Submerged Semicircular Breakwater Exposed to Regular Waves: An Experimental Study

Ali Hamood Al-Towayti,

Hee Min

2024

E3S Web of Conf.

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Many mangrove replanting programs fail due to the drifting of the mangrove sapling by waves and coastal currents soon after the replanting. Hence, adequate wave protection for the mangrove planting site is required to enhance the survivability rates of the newly planted saplings. A small scaled modular submerged semicircular breakwater (SBW) is perceived to be a viable option to provide the required level of wave protection to mangroves. The study is set to investigate wave transmission, reflection, and energy loss by a SBW subjected to different immersion depths under a regular wave environment via physical modelling. The SBW model was tested in a wave flume and was subjected to relative immersion depth, i.e., a ratio of water depth to the height of the SBW, of 1.00 and 1.33, and wave steepness ranging from 0.02 to 0.06. The alternatively submerged SBW was found to be an effective breakwater design to provide the required level of wave tranquility to various coastal applications.

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Section: Wave Energy Lossmentioning

confidence: 99%

Performance Characteristics of a Submerged Semicircular Breakwater Exposed to Regular Waves: An Experimental Study

Ali Hamood Al-Towayti,

Hee Min

2024

E3S Web of Conf.

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“…(3) where H m0 is the significant incident wave height, and H m0 ,t and H m0 ,r are the significant transmitted and reflected waves, respectively. Due to difficulty in measuring energy loss, the amount of energy dissipation at the breakwater is, therefore, estimated by the law of conservation of energy, yielding Equation (3).…”

Section: Water Depthmentioning

confidence: 99%

“…It achieved almost 35% wave attenuation with reflection of 80% of the incident wave energy when the breakwater width is 30% of the incident wavelength, and the draft is 20% to 33% of the water depth. Koutandos [3] further studied the performance of a fixed double partially immersed box type breakwater separated by a distance. The magnitudes of flow velocities, turbulence kinetic energy and vortices observed were much higher in the region of the first barrier than in the second one.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Semicircular Free Surface Ocean Structure under the Different Water Depths

Zhai

Teh

et al. 2011

AMM

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The increasing importance of the sustainability challenge in o engineering has led to the development of free surface ocean structure of various configurations. In this study, the hydrodynamic characteristics of a perforated free surface, semicircular breakwater (SCB) are investigated for irregular wave conditions under the different water depths. The performance of the breakwaters was evaluated in the form of coefficients of transmission (CT), reflection (CR) and energy dissipation (CL). The measured wave modification in front of the structure and in the structure’s chamber were quantified and presented in the form of a ratio relative to the incident wave height, respectively, which are then presented as a function of the relative immersion depth (D/d) and the relative structure width (B/Lp), where D = the depth of immersion, d = the water depth, B = the structure width and Lp = the wavelength corresponding to the peak wave period. The measured wave modification in front of the structure and in the breakwater’s chamber were quantified and presented in the form of a ratio relative to the incident wave height, respectively. It is found that the wave attenuation ability of the SCB model improves with the increase of D/d and B/Lp. The SCB performs better as an energy dissipater than as a wave reflector.

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“…The box-type barrier has the simplest form of design and effectively limits the wave transmission by reflecting the incident wave energy to the seaside of the structure. The efficiency of the breakwater can be further enhanced by (i) increasing the immersion depth of the structure [8], (ii) introducing a double barrier parted with a distance [9], and (iii) adding a keel plate to the bottom of the barrier [9]. According to [10], the trapezoidal barrier was found to be more functionally viable than the box-type barrier as it induced a higher degree of hydrodynamic interactions around the structure.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Waves with a Free-Surface Semicircular Breakwater: Experimental Investigation and Empirical Models

Teh

AL-Towayti

Venugopal

et al. 2023

JMSE

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This experimental study investigated the hydrodynamic performance of the first free-surface semicircular breakwater supported on piles under regular waves. The research focused on SCB models with porosity levels of 0%, 9%, 18%, and 27%. Experimental tests were conducted in a wave flume to evaluate the transmission (CT), reflection (CR), and energy dissipation (CL) coefficients of the SCB models. Wave disturbance coefficients (CF) in front of the breakwater and within the breakwater chamber (CC) were also examined. Horizontal wave loading was measured using normalized force coefficients (Fn), including force coefficients of wave crests (Fn,c) and wave troughs (Fn,t). Empirical formulas were proposed to provide a quick estimate of the hydrodynamic performance, showing good agreement with the measured data. The findings highlight the impact of varying porosity levels on wave attenuation, with the impermeable SCB model (0% porosity) exhibiting superior performance compared to the perforated SCB models. This research contributes valuable insights into optimizing SCB model design and enables efficient estimation of its hydrodynamic performance under regular wave conditions. The results provide valuable guidance for the design and implementation of SCB structures, enhancing their effectiveness in wave attenuation applications.

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Hydrodynamic analysis of a skirt breakwater

Cited by 7 publications

References 15 publications

Performance Characteristics of a Submerged Semicircular Breakwater Exposed to Regular Waves: An Experimental Study

Performance Characteristics of a Submerged Semicircular Breakwater Exposed to Regular Waves: An Experimental Study

Performance Analysis of a Semicircular Free Surface Ocean Structure under the Different Water Depths

Interaction of Waves with a Free-Surface Semicircular Breakwater: Experimental Investigation and Empirical Models

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