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Journal ArticleDOI

Wave Elevation on Large Circular Cylinders Excited by Wind-Generated Random Waves

About: This article is published in Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme.The article was published on 1988-02-01. It has received 2 citations till now. The article focuses on the topics: Elevation & Diffraction.
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TL;DR: In this article, a small-scale experimental study was performed to investigate wave runup on rigid full-length and truncated circular cylinders under regular and random sea conditions, where wave elevations were measured around one-half of the cylinder circumference together with the total in-line wave force.
Abstract: A small-scale experimental study was performed to investigate wave runup on rigid full-length and truncated circular cylinders under regular and random sea conditions. Wave elevations were measured around one-half of the cylinder circumference together with the total in-line wave force. The regular wave data were compared with predictions obtained using linear diffraction theory, and the results were consistent with the findings of earlier researchers. A regression analysis was performed on the regular wave data to obtain a relationship between the wave runup and the velocity head. The resulting empirical equation can be used to make preliminary estimates of wave runup on truncated circular cylinders. An approximate formula for predicting the time-dependent wave force on a truncated cylinder is presented. Transfer functions relating the enhanced wave-surface-elevation spectrum and the wave-force spectrum to the incident-wave spectrum are derived. The validity of the wave-force approximation and the adequacy of the linear transfer functions are examined in light of the new experimental data. As in the case of regular waves, the random-wave spectrum model does not adequately predict the root-mean-square (RMS) surface elevation at the front of the cylinder, but does provide a reasonably good estimate of the wave force on full-length and truncated cylinders. Extreme value estimates based on standard statistical procedures are compared with the experimental data and generally found to be conservative.

71 citations

Journal ArticleDOI
TL;DR: In this article, a numerical study of irregular waves in the Norwegian continental shelf wind farm (HAVSUL-II) was conducted using 3rd generation spectral wave models, which was composed of two parts: the study of the effect of a single windmill monopile in the local incoming wave field using an empirical JONSWAP spectrum, and a wave hindcast study in the wind farm area using realistic incoming wave spectra obtained from large scale simulations for the 1991-1992 winter period.

37 citations