... to reduce snap loads. Results are presented for a wide range of irregular sea states, varying significant wave height, wave period and directional spreading. Increasing directional spreading is found to reduce the maximum and standard deviations of the leading mooring line loads by up to 30-40% compared...

... suzuki coefficient peak enhancement factor formulation frequency measured data directional enhancement factor solid line exponent engineering practice expression spectral formulation dispersion mediterranean sea discrepancy barent sea wave steepness spectra spectrum...

... is found in the influence of the quality of the reconstructed directional wave spectrum derived from a standard directional wave buoy, in particular for the mild weather conditions here assumed as target for standard end-users of the boat. INTRODUCTION The study presented in this work is part...

... was influenced by the incident wave directions and directional spreading parameters slightly. INTRODUCTION Coral reefs are present in many tropical and subtropical regions, they are usually described as a steep slope and a reef flat with shallow water. As wave propagates from deep water to shallow region...

... subsea system winterstein naess platform case 2 upstream oil & gas offshore platform artificial intelligence reference point probability distribution wave elevation equation exceedance prob air gap eigenvalue analysis wave crest distribution directional case 1 Prediction...

... intensity along the 5 beams continuously at 2 Hz. Continuous sampling enabled us to capture details of several giant events with crest-to-trough heights in excess of 22 meters. A number of theoretical explanations have been proposed for such extreme waves, one of which involves directional focusing. Rogue...

... to the initial conditions, with small changes in parameters such as directional spreading giving significantly different results. In all cases, although as aforementioned in differing degrees, we find changes to the shape of the extreme wavegroup - the wave-groups contracting in the mean wave direction...

.... In this paper we investigate several points in connection with this approach. Firstly we examine some of the sensitivities involved in deriving second order statistics, including the high frequency cut-off, the directional spreading and spectral bandwidth. The paper then examines how the second order...

... Abstract A wave-basin experiment was conducted considering broad directional spreading in different water depth. Long-time surface elevation data were recorded. Freak waves generated by different mechanisms were observed and the effects of the directionality spreading on freak wave occurrence...

... ABSTRACT A wave basin experiment is carried out to investigate the interaction between multi-directional irregular waves with a large vertical bottom-mounted cylinder. In the experiment, the ratios of the significant wave height and water depth ( H 1/3 /d) are 0.08, 0.12 and 0.16...

... ABSTRACT: The present paper is concerned with the problem of estimating wave run-up on a vertical circular cylinder in an extreme wave environment. The waves are generated in a 3D wave basin using a focused wave method with different frequency and directional components. A practical method...

... ABSTRACT This paper describes the derivation and implementation of combined wave diffraction-refraction in a spectral directional wave model for coastal applications. The wave refraction is included in the total derivative of wave-action while diffraction is formulated as wave energy diffusion...

... (frequency and direction) is suggested to be used as a visualization tool to indicate the freakish sea state so that the ships are able to avoid the risk of encountering freak waves. KEY WORDS: marine accidents; freak wave; ONOMICHI- MARU; hindcast; WAVEWATCH III; wave spectra INTRODUCTION In the past, many...

... was described. A numerical model based on the High Order Spectral (HOS) method was developed, in which, the wave maker boundary condition was introduced to simulate the wave generation. The effect of the wave parameters such as the wave spectral type, center frequency, frequency width and the directional...

... energy devices. This study describes how the production matrix of the SEAREV wave energy device is modified by the directional spreading of the wave spectrum and the resulting influence on the annual production at a given test site. A cosine power '2s' function applied to a Pierson-Moskowitz spectrum...

...Research on Numerical Simulation of Multi-directional Wave Groups Shu-xue Liu, Yan Bao and Yuxiu Yu State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China ABSTRACT Based on the two-dimensional (x,t) case, a numerical method is described...

... ABSTRACT Whereas local and wavelet-based methods have mostly been applied to single time records of wave data, Donelan et al. (1996) derived and applied the Wavelet Directional Method (WDM) to small arrays of wave elevation recorders. After a short review of the Morlet wavelet transform...

... ABSTRACT Wave energy dissipation and energy transfer between wave components during the directional wave breaking are investigated experimentally. Directional breaking waves in deep water were simulated by focusing the multi-frequency and multi-directional wave components at a designed...

... some thresholds. Nevertheless, some events occur in sea-states where the prevision of classical parameters does not reflect them. Also it does not give information about some specific and potentially dangerous phenomena such as the increase of the steepness in case of opposite wave direction to current...

... enhancer full-scale measurement amplitude dir riser pipe directional model test oscillation test frequency spectra deep-sea basin Model Tests of Ocean Nutrient Enhancer TAKUMI in Deep-sea Basin Katsuya Maeda, Kenkichi Tamura, Kentaro Kokubun, Yutaka Ohkawa, Ryuzo Takai, Kyoko Shintomi...