Performance characteristics of a conical pile head breakwater: An experimental study

Sathyanarayana, Arunakumar Hunasanahally; Suvarna, S.; Umesh, Pruthviraj; Shirlal, Kiran G.

doi:10.1016/j.oceaneng.2021.109395

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…The equations are obtained by feeding the experimental data to the software, where the solutions are calculated based on the data fitting technique. The experimental data of the previous study on non-perforated CPHB 49 and the present work on perforated CPHB are used as the input data. In this process, several equations are obtained and the best equations are chosen based on the coefficient of determination (R 2 ) and relative root mean square error (RrmsE) values.…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

“…The structural parameters of CPHB include the top diameter of CPH (D), height of CPH (Y) and clear spacing between CPHs in a row (b). The D and Y are expressed in non-dimensional form using maximum wave height considered for experimentation (H max ), and b is expressed in terms of D. The influence of relative pile head diameter (D/H max ), relative pile head height (Y/H max ) and relative clear spacing between the CPHs (b/D) on the performance characteristics of non-perforated CPHB was investigated comprehensively in our previous study 49 and the optimum structural configuration was evolved (D/H max = 0.4, Y/H max = 1.5 and b/D = 0.1). In the present study, an attempt is made to further improve the performance of this CPHB structure by incorporating perforations.…”

Section: Physical Modelling Detailsmentioning

confidence: 99%

“…K tp and K rp are the reduction factors of wave transmission and reflection coefficients respectively, which are given by, Validation of equations. The experimental data published on non-perforated CPHB49 is considered to validate the potential of the non-perforated empirical equation and present experimental results are used for the perforated case. The validation of empirical equation results with the experimental data is presented in Figures18 and 19for non-perforated and perforated CPHB,…”

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confidence: 99%

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Investigation on innovative pile head breakwater for coastal protection

Sathyanarayana

Suvarna

Umesh

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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Coastal erosion is a global concern that has been augmenting due to the natural evolution of beaches, human activities and sea-level rise. One of the eco-friendly shore protection methods is to dissipate the wave energy by constructing offshore breakwaters. Conical pile head breakwater (CPHB) is one of the eco-friendly innovative offshore structures consisting of closely spaced piles with an enlarged cross-sectional area (conical pile head) in the vicinity of the free surface. In the present study, perforations are incorporated over the conical pile head to achieve higher efficiency by promoting energy dissipation. The influence of the perforations on the performance characteristics, namely wave transmission (Kt), wave reflection (Kr) and energy dissipation (Kd) of the perforated CPHB is comprehensively investigated through physical model studies. The effect of perforations and their distribution around the pile head (Pa), percentage of perforation (P) and size of perforations (S/D) on the wave attenuation characteristics are evaluated to arrive at an optimum configuration. The study is carried out under monochromatic waves of varying wave height (0.06–0.16 m) and wave period (1.4–2 s) at different depths of water (0.35, 0.40 and 0.45 m). A minimum Kt of 0.58 associated with Kr of 0.26 and Kd of 0.78 is obtained with an optimum configuration of Pa = 50%, P = 19.2% and S/D = 0.25. The Kt of the proposed CPHB is about 19 to 35% lesser than that of the perforated hollow pile breakwater under matching test conditions. Overall, providing the perforations is found to be effective in enhancing the wave attenuation capability by up to 12.4%. Further, empirical equations are formulated and validated with the experimental data. The empirical equations estimate the Kt and Kr values accurately with a high coefficient of determination ( R2 ≥ 0.90).

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Section: Comparison With Other Studiesmentioning

confidence: 99%

Section: Physical Modelling Detailsmentioning

confidence: 99%

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confidence: 99%

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Investigation on innovative pile head breakwater for coastal protection

Sathyanarayana

Suvarna

Umesh

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…Research extended in designing innovative breakwater structures. Some notable contributions in this regard include semi and quarter-circular breakwater 16 , 17 , plate breakwater 18 , tandem breakwater 19 , floating pipe breakwaters 20 , 21 , pile breakwater 22 , 23 etc. Along with these, geosynthetics are also widely used for various coastal engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Preliminary investigation on stability and hydraulic performance of geotextile sand container breakwaters filled with sand and cement

Elias

Shirlal

2022

Sci Rep

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Breakwaters are essential constructions providing tranquility to ports and harbour structures, when there is a lack of natural protection measures. Traditionally these massive structures are constructed using natural rocks weighing tonnes. In the present scenario, obtaining huge natural rocks are difficult as well as non-eco-friendly. Geotextiles sand containers (GSCs) emerges as a suitable alternative for the rock armour units of breakwaters and various literatures supports its efficacy. The present investigation aims at analysing the performance of GSCs when filled with a calculated amount of cement and sand. The Hydraulic performance and stability analysis of cement and sand filled geotextile breakwater models are carried out in a 1:30 scaled monochromatic wave flume. When GSC breakwaters are filled with sand and cement, up to 43% increased stability is observed with a considerable decrease in wave runup, rundown and reflection, than sand-alone filled units. As a result, cement-sand filled GSC units can be suggested as a possible alternative to sand alone filled units where vandalism has to be countered.

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“…First, simulations on non-perforated and perforated CPHBs are performed using monochromatic waves. The numerical results are validated with experimental data [27,28], and the most efficient structural CPHB configurations are chosen. Further, the performance of the efficient CPHB models is examined with irregular waves.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of an Innovative Conical Pile Head Breakwater

Sathyanarayana

Suvarna

Umesh

et al. 2022

Water

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When moderate wave activity at the shoreline is acceptable, pile breakwaters can serve as an alternative to conventional breakwaters. Increasing the size of the pile breakwater in the vicinity of the free surface increases the hydraulic efficiency, as most of the wave energy is concentrated around the free surface. Therefore, a conical pile head breakwater (CPHB) is proposed in the present study by gradually widening the diameter of the piles towards the free surface. Using the open-source computational fluid dynamics (CFD) model REEF3D, the transmission, reflection, and dissipation characteristics of the CPHB with monochromatic and irregular waves are examined. The investigation is carried out for both perforated and non-perforated CPHBs using monochromatic waves, and the numerical results are validated using experimental data. Further, optimally configured non-perforated and perforated CPHBs are investigated numerically by subjecting them to irregular waves using the Scott–Wiegel spectrum. The wave attenuation characteristics of the CPHBs are found to be better with irregular waves compared to monochromatic waves. With irregular waves, the minimum transmission coefficients for non-perforated and perforated CPHBs are 0.36 and 0.34, respectively. Overall, the CPHB appears to be a potential solution for coastal protection.

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Performance characteristics of a conical pile head breakwater: An experimental study

Cited by 10 publications

References 33 publications

Investigation on innovative pile head breakwater for coastal protection

Investigation on innovative pile head breakwater for coastal protection

Preliminary investigation on stability and hydraulic performance of geotextile sand container breakwaters filled with sand and cement

Numerical Modelling of an Innovative Conical Pile Head Breakwater

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