... characterization experimental result wave component north sea surface elevation elevation wave height analytical model water depth focus point offshore technology conference upstream oil & gas nd order spectra steepness stream function wave crest elevation experiment wave theory...

... of wave loading requires the accurate prediction of wave induced forces, which is used for the structural assessment. Determination of wave induced forces requires solution of two problems. The prediction of wave kinematics by using an appropriate wave theory and then the prediction of the pressure...

... Tourneau 116C jack-up operating in 60m of water in the North Sea and 100m of water in the Gulf of Mexico with the directional spreading formulation as recommended in ISO (2005), the 2nd order wave theory proved to be adequate for modelling the kinematics under extreme directional waves when tested against...

... kinematics provide an important basis for wave load computations in design analyses of offshore structures. For simplicity, it is a standard practice in the offshore industry to use the linear wave theory and empirical stretchings to calculate wave kinematics. Popular stretching methods in- clude the Wheeler...

... in Morisoxfs equation. velocities must be updated4. The two dmensz onal wave kinematics can be calculated 27 using the appropriate order of StrpamThe use of apparent regular waves to calculate kinematics in irregular seas are shown to lead to Function wave theory. In many cases Stokes V wave misleadmg...

... of API RP2A as follows: - wave height as determined from Figure 2.3.4-3 based upon MLLW (mean lower low water) - wave period of 13 seconds for all water depths - tide as determined from Figure 2.3,4-7 based upon MLLW - wave theory as required by water depth and wave height (Chappelear numerical wave...

... to be satisfactorily consistent with numerical results based on the finite-amp1 i tude wave theory. Both numerical results and measurements are compared with the predictions of the three methods, and this comparison indicates that the prediction accuracy of each approximate method depends upon the bandwidth...

... procedures were developed for predicting wave forces on deck beams using regular waves as described by stokes Fifth Order Wave Theory. Regular wave theory is commonly used for offshore platform design; however, it is recognized by designers as a conservative approach since "real world" sea states consist...

... frequency calculation fatigue life analysis fatigue damage fatigue life marginal distribution wave height upstream oil & gas history scatter diagram fatigue analysis wave theory variation riser wave zone iteration block stress range seastate domain method aTe 5468...

... enabled direct derivation of the force coefficients and evaluation of wave theory. A mean square technique has been used to derive force coefficient and much emphasis has been placed on the associated total force coefficient. The force coefficients have been found to be reasonably in line with design...

... in. and frequencies ranging from 0.4 to 0.9 Hz that the Monson equation, with Stokes wave theory and constant drag and inertia coefficients of 1.2 and 1.8, respectively, provides good agreement with the measured maximum wave forces. The force variation over the entire wave cycle is also well represented...

... to investigate the effect of combined waves and current on surge response. The tests were con- ducted in regular, random and grouped waves. Current was simulated by towing the model. Two different forms of linear wave theory based on stretching and extrapolating wave particle kinematics from Airy wave theory up...

... of the surface of the ocean. Designers must have confidence in their ability to predict, from measured wave data, wave kinematics and hence wave forces. Until the recent past, regular wave theories have normally been used to predict water particle kinematics from surface elevations measurements. However, except...

... ABSTRACT A method is described for determining the elastic shear modulus of marine sediments from field measurements of wave-induced bottom acceleration and water pressure. The procedure relies on results from a wave theory that assumes a linearly elastic sea floor response. The method is thus...

... perforated ball instruments developed specially for this project. The particle velocities in depth limited waves have been found to be over predicted by shallow water wave theories. The Tower has a concrete gravity base sited on fine sand overlying clay. The size of the original base was minimised to give...

... cylinder offshore pipeline velocity field morison equation submerged pipeline reynolds number velocity ratio coefficient wave theory particle kinematic airy wave theory elevation order wave theory drag force equation superposition simultaneous measurement upstream oil & gas...

... morison equation transfer function wave theory offshore structure force coefficient subsea system design wave coefficient wave force structural member loading otc paper wave height platform hydrodynamic loading cylinder upstream oil & gas regime engineer equation offshore...

... subsea system exp resistance pile radius probability application wall thickness wave load estimate offshore platform risk institut fur bauingenieurvjesen iii upstream oil & gas wave height storm wave theory early stage reliability function model OTC 3106 AN APPLICATION...

...) presenta- tion of drag, lift, and inertia coefficients that can be used in the Morison equation in combinationwith._ Stokes' third-order wave theory. 217 where Fdim = dimensionless force Fmax = maximum measured force y = -specific weight of water H = wave height L =-wavelength V = volume of model (total...

.... Much theoretical effort has been devoted to the vital step of developing wave theories with which to predict the kinematics from the surface description of the waves. However, until recently, instrumentation permitting verification of the theories under realistic conditions has not existed...