Wave forces on vertical cylinders upon shoals

Kyte, Alexander; Tørum, Alf

doi:10.1016/0378-3839(96)00003-8

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…This was followed by the application of drag and inertia forces for a wave interacting with a cylinder as described by the Morison equation (Morison et al, 1950). The spatial distribution of loads in the azimuthal direction was described by Wienke and Oumeraci (2005) and a qualitative vertical distribution was based on the work of Kyte and Tørum (1996). Wave parameters used in the formulae were based on the buoy data and typical wave breaking characteristics.…”

Section: Finite-element Model Resultsmentioning

confidence: 99%

“…Other findings, including those arising from interest in oil platforms, included confirmation of the variability of impacts (Chan et al, 1995;Lykke Andersen et al, 2011), the importance of breaking wave type to the resulting impact (Chan et al, 1995;Wienke and Oumeraci, 2005) and their spatially localised nature (De Vos et al, 2007;Kyte and Tørum, 1996). Also of great relevance to rock lighthouses has been the work to investigate the role of bathymetry, specifically reefs, into the wave transformation and subsequent impact (e.g.…”

Section: A Brief Review Of Current Measuring Techniques and Knowledgementioning

confidence: 99%

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Wave loading on rock lighthouses

Raby¹,

Bullock²,

Banfi³

et al. 2016

Proceedings of the Institution of Civil Engineers - Maritime En

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Historical and contemporary observations of wave-impact loading on rock lighthouses during storms are presented.With climate change potentially causing sea level rise and more energetic wave climates, the longevity of these heritage structures cannot be taken for granted. To obtain a better understanding of the wave-structure interaction, Plymouth University has been working with the General Lighthouse Authorities to develop monitoring and modelling techniques suitable for these isolated masonry structures. Details of the field campaign, in which 2978 impact events were recorded during the winter storms of 2013/2014, are presented together with an initial analysis that begins to shed light on the dynamic response of these iconic structures. The results indicate that the response can be sensitive to the type of wave impact and that the overall motion of the Eddystone tower was less than might have been expected. A finite-element model of the tower was able to reproduce accurately the frequencies of the first and third modes of vibration but, unlike the field data, failed to show response at a frequency near the second mode. Preliminary attempts to apply wave loads estimated on the basis of ISO 21650 show reasonable agreement between the model displacements and those measured.

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Section: Finite-element Model Resultsmentioning

confidence: 99%

Section: A Brief Review Of Current Measuring Techniques and Knowledgementioning

confidence: 99%

Wave loading on rock lighthouses

Raby¹,

Bullock²,

Banfi³

et al. 2016

Proceedings of the Institution of Civil Engineers - Maritime En

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“…The experimental results confirm the slamming coefficient found by Wagner (1932) [30], who considered the "pile-up" effect and estimated C s (t=0) = 2π at the beginning of the impact. Furthermore, based on Kyte and Tørum's, (1996) [32] work, which focused on vertical cylinders upon submerged shoals, C s was further calculated using the method proposed by Goda (1972) [33] and found equal to 6.8 (which is greater than 2π) with some scatter. According to Wienke and Oumeraci (2005) [3] and Irschik and Oumeraci (2004) [31], the peak impact occurs at t = 0, which is similar to Goda's theory.…”

Section: = + +mentioning

confidence: 99%

Influence of the Spatial Pressure Distribution of Breaking Wave Loading on the Dynamic Response of Wolf Rock Lighthouse

Dassanayake

Antonini

Pappas

et al. 2021

JMSE

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The survivability analysis of offshore rock lighthouses requires several assumptions of the pressure distribution due to the breaking wave loading (Raby et al. (2019), Antonini et al. (2019). Due to the peculiar bathymetries and topographies of rock pinnacles, there is no dedicated formula to properly quantify the loads induced by the breaking waves on offshore rock lighthouses. Wienke’s formula (Wienke and Oumeraci (2005) was used in this study to estimate the loads, even though it was not derived for breaking waves on offshore rock lighthouses, but rather for the breaking wave loading on offshore monopiles. However, a thorough sensitivity analysis of the effects of the assumed pressure distribution has never been performed. In this paper, by means of the Wolf Rock lighthouse distinct element model, we quantified the influence of the pressure distributions on the dynamic response of the lighthouse structure. Different pressure distributions were tested, while keeping the initial wave impact area and pressure integrated force unchanged, in order to quantify the effect of different pressure distribution patterns. The pressure distributions considered in this paper showed subtle differences in the overall dynamic structure responses; however, pressure distribution #3, based on published experimental data such as Tanimoto et al. (1986) and Zhou et al. (1991) gave the largest displacements. This scenario has a triangular pressure distribution with a peak at the centroid of the impact area, which then linearly decreases to zero at the top and bottom boundaries of the impact area. The azimuthal horizontal distribution was adopted from Wienke and Oumeraci’s work (2005). The main findings of this study will be of interest not only for the assessment of rock lighthouses but also for all the cylindrical structures built on rock pinnacles or rocky coastlines (with steep foreshore slopes) and exposed to harsh breaking wave loading.

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“…Studies of the force distribution on a vertical cylinder from non-breaking waves are rare. (Kyte and Tørum, 1996) measured the local force above the still water level in a set-up similar to that of (Tanimoto et al, 1986). (Wienke and Oumeraci, 2005) studied the breaking wave impact on vertical and inclined circular cylinders.…”

Section: Introductionmentioning

confidence: 99%