Hydrodynamic efficiency of partially immersed caissons supported on piles

Rageh, O. S.; Koraim, A.S.; Salem, Tarek N.

doi:10.1016/j.oceaneng.2009.06.009

Cited by 26 publications

(5 citation statements)

References 15 publications

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“…A caisson supported on a tightly spaced pile system, as well as pile breakwaters made up of two rows of circular and square piles positioned in straight and staggered locations, were also investigated. Rageh and Koraim (2010) [24] evaluated an experimental scenario, the performance of barriers caissons supported by two or three columns of piles. The caisson construction and the supporting pile system were tested.…”

Section: Introduction / Uvod *mentioning

confidence: 99%

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Hussein¹,

Ibrahim²

2022

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The purpose of breakwaters is to protect the ports, beaches, or beach facilities from strong waves and storms, as they help establish calm inside the port and thus achieve safety for ships and ease of operation. This paper presents an experimental and numerical study of unconventional alternatives to the vertical breakwater in order to evaluate the hydrodynamic performance of the proposed models. Two proposed cases for a semi-submerged breakwater were selected in the form of a half-pipe section with an inside diameter of 20 cm and a thickness of 1 cm. Case (a) was of the concave type of semicircular breakwater, while case (b) was of the convex type. Numerical modeling FLOW 3D was used to construct numerous scenarios for numerical simulation of the proposed breakwaters. The obtained results indicates that, when comparing the wave transmission coefficient (Kt) and its reflection coefficient (Kr) with the relative water depth (h/L), the transmission coefficient decreased with the relative height of the wave, while the reflection coefficient was completely reversed. In case (a), Kt was less than in case (b) at a range of 10% to 15%, while Kr in case (a) was bigger than in case (b) at a range of 5% to 10%. When the wave hit the breakwater, it was reflected back as its energy is dissipated in less water depth and its speed decreases as it approaches the port. The velocity of the wave decreases as it approaches the bottom, which means that the wave is affected by the depth of the water, i.e. the lower the water depth, the lower the wave velocity. Case (a) was more efficient and effective in wave dissipation, current velocity, and bed stability than case (b), so it is recommended to use case (a) due to its efficiency in protecting coastal areas and generating electricity.

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Section: Introduction / Uvod *mentioning

confidence: 99%

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Hussein¹,

Ibrahim²

2022

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“…The results of Hsiao et al, 8 revealed that the K r for a porous double-row structure attains a peak for 2S/L (S is the structure gap spacing, L is the incident wavelength) = 1 or 2, for lesser porosity. Rageh et al, 9 introduced a new type of breakwater supported on two or three rows of piles and stated that it exhibited an energy loss coefficient of about 10%-30%. Ji and Suh 10 developed a mathematical model to compute the hydrodynamic characteristics of a multiple-row curtain wall-pile breakwater and validated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics of vertical and quadrant face pile supported breakwater under oblique waves

Jeya

Sriram

Sundar

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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This paper presents the results from a comprehensive experimental study on the Quadrant Face Pile Supported Breakwater (QPSB) in two different water depths exposed to three different oblique wave attacks. The results are compared with that for a Vertical face Pile Supported Breakwater (VPSB) for identical test conditions. The paper compares the reflection coefficient, transmission coefficient, energy loss coefficient, non-dimensional pressure, and non-dimensional run-up as a function of the relative water depth and scattering parameter. The results obtained for QPSB are validated with existing results. The salient observations show that QPSB experiences better hydrodynamic performance characteristics than the VPSB under oblique waves.

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“…This minimum transmission coefficient is comparable to the transmission coefficients of Stiassnie et al (1986) as well as the wave amplification factors of Neelamani and Rajendran (2002a) and Neelamani and Vedagiri (2002), but much smaller than the transmission coefficients of Koutandos et al (2005) as well as the wave amplification factors of Neelamani and Rajendran (2002b), at the same / B L and with similar relative drafts. ; this minimum transmission coefficient is much smaller than the transmission coefficients of Isaacson et al (1999) and Brossard et al (2003) as well as the wave amplification factors of Koraim (2013), Rageh et al (2009), Neelamani and Gayathri (2006) and Sundar and Subba rao (2002), at the same / B L and with similar relative drafts. It is concluded from this comparison that the performance of the pile-supported OWC-type breakwater is not inferior to all other breakwaters reported in the literature.…”

Section: )mentioning

confidence: 73%

“…Chapter 5 is a follow-up investigation of Chapter 4, and studies the hydrodynamic performance of a rectangular floating breakwater with asymmetric pneumatic chambers (a narrower chamber on the seaside and a wider chamber on the leeside of the rectangular floating breakwater). (Koraim, 2013), partially-immersed caissons (Rageh et al, 2009), multiple-layer breakwaters (Wang et al, 2006), twin-plate wave barriers (Neelamani and Gayathri, 2006), box-type breakwaters with a porous plate (Koutandos et al, 2005), absorbing perforated-wall breakwaters (Brossard et al, 2003), ⊥ -type breakwaters (Neelamani and Rajendran, 2002a), T-type breakwaters (Neelamani and Rajendran, 2002b), twin-vertical barriers (Neelamani and Vedagiri, 2002), quadrant front-face breakwaters (Sundar and Subba rao, 2002) and suspended double slotted barriers (Isaacson et al, 1999). All these pile-supported breakwaters were designed to dissipate more wave energy through vortex shedding, generation of turbulence, or wave breaking.…”

Section: Outline Of Thesismentioning

confidence: 99%

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Experimental investigation of pile-supported/floating breakwaters integrated with oscillating-water-column converters

He¹

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Nowadays, more than half of the world population live in coastal regions, and coastal areas are vital with many economic benefits. Breakwaters are commonly used to protect harbors and coasts from wave attack. Traditional bottom-sitting breakwaters can effectively fulfill the demands of harbor protection in places where water is relatively shallow. However, the heavy traffic and large ship tonnage due to rapidly-developed international trade and maritime transportation are demanding much deeper water depth in harbors. As a result, new harbors are extending towards the ocean and traditional bottom-sitting breakwaters are no longer suitable economically. There is a need for new types of breakwaters that can effectively and economically be deployed in places where water is deep or bottom foundation is weak.

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Hydrodynamic efficiency of partially immersed caissons supported on piles

Cited by 26 publications

References 15 publications

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Hydrodynamic characteristics of vertical and quadrant face pile supported breakwater under oblique waves

Experimental investigation of pile-supported/floating breakwaters integrated with oscillating-water-column converters

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