Impact Loadings on Vertical Walls in Directional Seas

Allsop, N.W.H.; Calabrese, M.

doi:10.1061/9780784404119.154

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…This is despite a number of simplified assumptions, among which the fact of applying results of mostly bi-dimensional model tests (i.e., the Goda and Takahshi formulae) to fully 3D experiments, where the structure width is rather small compared to the extension of the wave front. In this regard it should be noted this approach is generally conservative as it has long been recognized that under oblique seas, the lack of wave coherence along the wall produces a reduction of the mean peak force [23][24][25]. However this aspect might concern the Japanese empirical formulae, while the momentum flux approach is supposed to apply to 3D situations as long as the hypothesis of neglecting the convective term is realistic.…”

Section: Discussionmentioning

confidence: 99%

Non Breaking Wave Forces at the Front Face of Seawave Slotcone Generators

et al. 2012

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Abstract:The Seawave Slotcone Generator (WAVEnergy SAS, 2003) is a wave energy converter based on the overtopping principle. Although it has been effectively researched during the last decade, no design tool has been supplied to estimate the hydrodynamic loads the waves exert on its front face. In this article a set of well reliable 3D experiments has been re-analyzed, in order to get indications on possible calculation methods. It is shown that the Japanese design tools for monolithic sea dikes may be reasonably adapted to the present case. Finally a new approach is presented, which is based on the so called momentum flux principle; the resulting predictive equation fits the experimental data remarkably well.

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Section: Discussionmentioning

confidence: 99%

Non Breaking Wave Forces at the Front Face of Seawave Slotcone Generators

et al. 2012

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“…Goda 9 presented an empirical formula, from which, the wave force per unit breakwater could be calculated, as the incident wave angle increased. Allsop and Calabrese 26 and Calabrese et al 27 found that impacts were less frequent with oblique waves than with a normal attack, and proposed a reduction factor for a range of incident angle, β between 0° and 30°. The reduction factor increases with an increase in β .…”

Section: Introductionmentioning

confidence: 99%

Experimental study of wave force on breakwater head under oblique waves

Han

Dong

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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The head of a breakwater warrants special consideration to achieve the necessary stability at vulnerable part of its structure. To widen the entrance to a harbour, a caisson is used for the breakwater head. Therefore, the wave force on the caisson head under oblique waves was analysed in this study. Physical model tests were performed in a wave tank, where wave loads on two weathering sections (S1 and S2) of the caisson head were measured under oblique-regular and irregular wave attacks. The results have shown that the improved Goda’s method can predict the wave forces on the caisson head. The wave forces on the two sections increased with an increase in the period under different incident angles. The phase lag between the horizontal forces on S1 and S2 was evidently influenced by the incident angle. The relationship between the maximum wave force on one section and its accompanying wave force on another section was described, and the results have demonstrated that under the same incident angle, as the period increased, the maximum wave force of S1/S2 is gradually equal to its accompany wave force of another section.

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“…Concerning this issue, several researchers have investigated influence of wave obliquity on the wave loading on solid vertical breakwaters (Franco et al, 1996;Allsop & Calabrese, 1998;Frigaard et al, 1998). They assessed the effects of wave obliquity and multi-directionality on the hydraulic response of non-perforated caisson walls.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Wave Pressure on Perforated Caisson Wall Under Oblique Wave Incidence

et al. 2014

Int. Conf. Coastal. Eng.

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Three dimensional experiments were carried out in a wave basin in order to examine the effects of wave obliquity on the wave pressure acting on perforated caisson walls. The magnitudes of pressures measured under oblique waves did not show decaying trend predicted by Goda's formula, for both the front and rear walls of the caisson. On the contrary, the wave force on a single caisson, estimated by integration of the vertical pressure profiles on the caisson front, showed slightly increasing trend on average with increase of the wave incidence angle. Meanwhile, the simultaneously measured wave force for the whole caissons is found to be apparently reduced with wave obliquity as a result of peak-delay force reduction in lateral direction along the caisson fronts.

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Impact Loadings on Vertical Walls in Directional Seas

Cited by 3 publications

References 4 publications

Non Breaking Wave Forces at the Front Face of Seawave Slotcone Generators

Non Breaking Wave Forces at the Front Face of Seawave Slotcone Generators

Experimental study of wave force on breakwater head under oblique waves

Measurement of Wave Pressure on Perforated Caisson Wall Under Oblique Wave Incidence

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