Wave Kinematics and Environmental Forces : Papers Presented at a Conference Organized by the Society for Underwater Technology and Held in London, U.K., March 24–25, 1993

In determining the response of offshore structures, it is of utmost importance to determine, in the most correct manner, all factors which contribute to the total force acting on these structures. Applying the Morison formula (Morison et. al. , 1950) to calculate forces on offshore slender structures, uncertainties related to the understanding of the wave climate, the hydrodynamic force coefficients and the kinematics of ocean waves represent the most important contributions to the uncertainties in the prediction of the total forces on these structures (Haver and Gudmestad, 1992). Traditional calculation of forces on offshore structures involves the use of regular waves with the following non-linearities inco1porated use of regular wave theories inco1porating higher order terms use of Morison equation having a nonlinear drag term inclusion of the effect of the free surface by integrating all contributions to total forces and moments from the sea floor to the free surface of the waves In order to describe the sea more realistically, the ocean surface is to be described as an irregular sea surface represented by its energy spectrum. The associated decomposition of the sea surface is given as a linear sum of linear waves. The total force is found by integrating the contribution from all components in the wave spectrum to the free surface. The kinematics of each component must therefore be determined. Front Matter....Pages i-viii Front Matter....Pages 1-1 Technical Update and Field Data from the New Generation Microwave Directional Wave Radar....Pages 3-17 Wave Kinematics — Measurement, Modelling and Application....Pages 19-33 Non-Linear Wave Current Interactions....Pages 35-51 Effects of a Shear Current on Wind Induced Waves....Pages 53-73 Uncertainties in Prediction of Wave Kinematics in Irregular Waves....Pages 75-99 Wave Kinematics on Sheared Currents....Pages 101-113 Laboratory Wave Generation Correct to Second Order....Pages 115-139 Front Matter....Pages 141-141 Comparison of Loads Predicted Using “Newwave” and Other Wave Models with Measurements on the Tern Structure....Pages 143-159 Wave Loading Model Tests on a Gravity Base Structure....Pages 161-189 Added Hydrodynamic Loading due to Sacrificial Anodes....Pages 191-207 The Vortex Induced Vibration of Marine Risers in Sheared and Critical Flows....Pages 209-238 Suppression of Vortex Shedding from Satellite Risers in a Current....Pages 239-247 Front Matter....Pages 249-249 Review of Wave Breaking in Shallow Water....Pages 251-273 Three-Dimensional Breaking Wave Kinematics....Pages 275-287 Environmental Forces at the Coastline and Implications for Coastal Defence....Pages 289-306 Full Field Study of Post Breaking Vorticity....Pages 307-316 Multigrid Model of Wave-Current Interaction....Pages 317-327 Variation of Beach Profiles in Hell’s Mouth Bay, Llyn Peninsula for the Period 1979–1981....Pages 329-345

This volume presents the proceedings of an international conference held on 24-25 March, 1993 in London under the auspices of the Society for Underwater Technology.
Contributions have been selected from three major areas of development: the measurement and prediction of the kinematics of waves and of combined waves and currents; the derivation of environmental forces on structures whether offshore or coastal; and problems peculiar to shallow or coastal waters, with particular emphasis on breaking waves.
This book is of value to engineers and scientists interested in the latest advances in research and development in the determination of environmental forces on offshore and coastal structures.