Experimental Investigation on Wave Reflection Characteristics of Slotted Vertical Barriers with an Impermeable Back Wall in Random Wave Fields

Neelamani, S.; Al-Salem, Khaled; Taqi, Altaf

doi:10.1061/(asce)ww.1943-5460.0000395

Cited by 40 publications

(5 citation statements)

References 21 publications

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“…In general, finding the friction factor is cumbersome and the study presented the friction factor in terms of relative submergence of the skirt walls. Recently, Neelamani et al (2017) documented the multiple slotted vertical barriers with the rigid leeward wall to replace the sloping breakwater in the random wave fields. The study suggests that the size of rubble mound breakwater can be reduced up to 50% along with the reduction in 21% of construction cost with three slotted walls having 40% porosity without affecting the energy damping.…”

Section: Introductionmentioning

confidence: 99%

Influence of Impermeable Elevated Bottom on the Wave Scattering due to Multiple Porous Structures

Venkateswarlu¹,

Karmakar²

2020

JAFM

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The significance of multiple porous structures with finite spacing upon elevated seabed in the presence and absence of the leeward wall is examined under oblique wave impinging. Fluid propagation is assumed over the impermeable elevated bottom, and the fluid realm is separated into open water and porous structure regions. Continuity of the dynamic pressure and mass fluxes at the interfaces of the porous structure and the open water regions are adopted. The resistance and reactance due to the presence of the porous structure are taken into account using the porous structure dispersion relation. The numerical model is developed based on the eigenfunction expansion method along with matched velocity potentials at the interfaces of open water and the porous block regions. The wave reflection and transmission characteristics, energy damping and wave force impact on the leeward wall is analysed. The significance of the porosity, structural width, angle of incidence, width between the two structures and water chamber length is studied considering multiple porous blocks with finite spacing under oblique wave impinging in the presence and absence of leeward wall. The numerical results obtained in the present study agrees well with the theoretical and experimental results available in the literature. The present study illustrates that, with the increase in the number of porous blocks and gap between the porous blocks, the resonating trend is observed in the wave transformation and the influence of the elevated step height is revealed for the wave trapping.

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Section: Introductionmentioning

confidence: 99%

Influence of Impermeable Elevated Bottom on the Wave Scattering due to Multiple Porous Structures

Venkateswarlu¹,

Karmakar²

2020

JAFM

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“…Wang et al 34 illustrated a Jarlan-type caisson in their research. Neelamani et al 35 examined a double-layered slotted wall prototype for a perforated barrier. Moreover, surface waves in reservoirs or lakes induced by landslides during earthquakes are being studied by using the thin porous-wavemaker hypothesis, which has numerous applications in the research of surface waves in such water bodies.…”

Section: Background and Introductionmentioning

confidence: 99%

A mathematical study of water wave interaction with a thin perforated barrier in a two-layer fluid over a permeable bottom

Barman

Bora

2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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This article studies the impact of a submerged interface-piercing perforated barrier in a two-layer fluid flowing over a permeable bottom. We investigate oblique wave scattering, trapping and radiation due to the structure focusing on the bottom permeability. The dead water phenomenon is analysed with the consideration of the bottom permeability, which results in a higher variation of the interfacial wave due to the bottom permeability. The matched eigenfunction expansion method and the least square technique are used to calculate various hydrodynamic coefficients. Wave energy identity relation is derived for the scattering scenario, and the associated energy loss due to the barrier is calculated. In order to attain the maximum wave dissipation, an ideal porous-effect parameter of the barrier is proposed for consideration, and it is observed that larger values of porous-effect parameter result in the lowest feasible pressure distribution. A good comparison with a prior result justifies the current semi-analytical procedure. Furthermore, the verification of the energy-identity terms aid in the validation of the computed results. Additionally, wave trapping in a confined region is examined by investigating reflection coefficients by considering a rigid wall. The thin perforated barrier model is further considered for examining the radiation aspect while considering its slow motion. For various porous-effect parameters of the barrier, the amplitude ratio of the radiated potential is investigated, and it is clearly observed that higher frequency significantly lowers the amplitude for both free surface and interfacial propagating modes. The impact of the perforated barrier is analysed by investigating the essential hydrodynamic coefficients, namely, added mass and damping coefficient.

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“…López et al (2018) proposed a novel perforated-wall caisson concept, the LOW Reflection Breakwater, based on a three-chamber, perforated-wall, and inner weirs. Neelamani et al (2017) assessed experimentally the wave reflection of slotted vertical barriers with an impermeable rear wall. A reduction in wave height (i.e., 20-30%) and minimum reflection coefficients of 0.3 were obtained.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

A novel concept for reducing wave reflection from OWC structures with application of harbor agitation mitigation/coastal protection: Theoretical investigations

et al. 2021

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Experimental Investigation on Wave Reflection Characteristics of Slotted Vertical Barriers with an Impermeable Back Wall in Random Wave Fields

Cited by 40 publications

References 21 publications

Influence of Impermeable Elevated Bottom on the Wave Scattering due to Multiple Porous Structures

Influence of Impermeable Elevated Bottom on the Wave Scattering due to Multiple Porous Structures

A mathematical study of water wave interaction with a thin perforated barrier in a two-layer fluid over a permeable bottom

A novel concept for reducing wave reflection from OWC structures with application of harbor agitation mitigation/coastal protection: Theoretical investigations

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