Showing papers in "Applied Ocean Research in 1983"

TL;DR: In this paper, it was shown that for wind waves modelled by a stationary Gaussian process ζ(t) (ζ = height above m.w.l. of one point of the free surface) it is possible to find analytically the characteristic periods of the highest waves in a sea with a given energy spectrum.

TL;DR: In this paper, a two-dimensional hybrid finite element method is developed to study the scattering of water waves by an island and to calculate wave forces and moments on offshore structures, which can be applied to both long-wave and short-wave problems.

TL;DR: Methode de linearisation de terme du mouvement relatif dans une fonction de refoulement as mentioned in this paper is an application pratique aux conditions de l'environnement en Mer du Nord.

TL;DR: In this paper, a method for calculating flows around cylinders of arbitrary shape, which may be in an array, is presented for an isolated circular cylinder in steady and oscillatory incident flows.

TL;DR: In this paper, non-linear probability distributions for Morison-type wave loading are used to indicate the effect of drag forces on the expected fatigue damage and the expected extreme response of quasi-statically responding (members of) offshore structures.

TL;DR: In this article, a train of regular surface waves is incident upon a fixed, half-immersed, circular cylinder; the waves are partially reflected and partially transmitted, and also induce hydrodynamic forces on the cylinder.

TL;DR: A short-term model for the representation of ocean waves is considered in this article, where the validity of the basic assumptions regarding stationarity and Gaussianity, together with uncertainties related to the shape of the spectral density function, are discussed.

TL;DR: In this paper, a finite element method incorporating radiation boundary dampers is employed to solve the corresponding diffraction/radiation boundary value problems, where flexural mode responses are assumed. But the results of both cases compare closely with those obtained by the method of multipoles.

TL;DR: In this article, it was demonstrated that for linear deep sea waves with small directional scattering the particle motion at the sea surface and energy transmission may be retrieved from a wave record by means of the Hilbert transform.

TL;DR: In this paper, a detailed description of a stereophotographic technique to obtain detailed observations of the geometry of ocean waves is given, followed by a description of the requirements of an operational system.

TL;DR: In this paper, the mean directional spectrum is recalculated for each site, and a proper allowance found for refraction which raises the estimates of net energy flux in intermediate depths by up to 10%.

TL;DR: In this article, a new method for approximating time dependent drift forces in irregular, long or short crested sea is presented based on the assumption that the wave energy spectrum is narrow-banded.

TL;DR: In this article, the authors reviewed the hydrodynamic basis for estimating the capacity of booms used as oil barriers, and proposed a new correlation for entrainment loss estimates based on information from recent research on headwave phenomena and on the full-scale loss data from the United States Coast Guard sea trials.

TL;DR: In this paper, a theoretical and numerical approach to the dynamical behavior of risers in deep water is presented, which takes into account viscous drag forces and that due to the large displacements of the riser when submitted to strong axial loads.

TL;DR: In this article, a tower hinged at the bottom was oscillated mechanically in a sinusoidal fashion in a plane in still water, and an instrumented section in the tower measured the inline and transverse forces locally on the tower due to the hydrodynamic effects.

TL;DR: In this paper, a wave energy converter consists of an array of small floating bodies moving in surge and restrained by dampers, and the hydrodynamic behavior of one such body is studied theoretically and experimentally.

TL;DR: In this paper, a solution to the problem of calculating the hydrodynamic forces on multiple floating bodies is summarised, and interpolation and extrapolation schemes based on a novel representation of the coefficients are proposed and tested.

TL;DR: In this article, a Fourier series is used to represent the far-field radiation potential, and the number of terms in the series determines the maximum output of the system subject to the restriction of optimum motions.

TL;DR: In this paper, the moment generating function and the probability function for non-deterministic wave forces on a small diameter fixed vertical pile are derived for linear, Gaussian waves.

TL;DR: In this paper, the Keulegan-Carpenter number (Kc) was used to measure the forces on a circular cylinder with nominally two-dimensional current and oscillatory flow at right angles.

TL;DR: In this article, an effective method for the linear analysis of dynamic response of submerged underwater oil storage tanks resting on a horizontal seabed to horizontal earthquake excitations is presented, where a general hybrid finite element solution procedure has been formulated, wherein the tank structure, interior fluids, as well as the near-field of the exterior water region are discretized into a toroidal finite-element network.

TL;DR: In this paper, the wavemaking capability and energy absorbing characteristics of a single submerged body, constrained to move horizontally in a surge mode, are examined, and the body possesses both a vertical axis of symmetry and a horizontal plane of symmetry.

TL;DR: In this paper, a non-linear buckling analysis of ring stiffened cylindrical shells subject to external pressure is presented, where failure is assumed to occur when the material reaches a plastic stress state defined by the Ilyushin criterion.

TL;DR: In this article, water surface profiles and horizontal and vertical water particle velocity components have been measured to investigate the properties of intermediate depth waves generated in the laboratory, and the data has been compared with linear wave theory.