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Uncertainties in Prediction of Wave Kinematics in Irregular Waves
Abstract Irregular water wave kinematics have recently been measured in the wave flume at Norwegian Hydrodynamics Laboratories (NHL) in Trondheim, using Laser Doppler Velocimetry (LDV) equipment (Skjelbreia et al., 1989 and 1991). The use of Wheeler stretching theory to estimate water wave kinematics in irregular waves is recommended to represent the best fit to the measurements. Reviewing available literature on water wave kinematics, Gudmestad (1992) arrives at the same conclusion. Uncertainties in the estimate of water wave kinematics is, however, shown to represent one of the main sources of uncertainties for the calculation of forces on slender structures like jackups in relatively deep water. The need to further determine the uncertainty in the water wave kinematics prediction is pointed out (Haver and Gudmestad, 1992). The data from the NHL tank tests have recently been reassessed and revised estimates of the uncertainties in wave kinematics are presented. Both the deviation from Wheeler theory and the spreading of the results have been estimated as function of depth below the surface. The influence of the revised estimates of the uncertainty in water wave kinematics on the overturning moment of a drag dominated structure is reviewed.
Uncertainties in Prediction of Wave Kinematics in Irregular Waves
Abstract Irregular water wave kinematics have recently been measured in the wave flume at Norwegian Hydrodynamics Laboratories (NHL) in Trondheim, using Laser Doppler Velocimetry (LDV) equipment (Skjelbreia et al., 1989 and 1991). The use of Wheeler stretching theory to estimate water wave kinematics in irregular waves is recommended to represent the best fit to the measurements. Reviewing available literature on water wave kinematics, Gudmestad (1992) arrives at the same conclusion. Uncertainties in the estimate of water wave kinematics is, however, shown to represent one of the main sources of uncertainties for the calculation of forces on slender structures like jackups in relatively deep water. The need to further determine the uncertainty in the water wave kinematics prediction is pointed out (Haver and Gudmestad, 1992). The data from the NHL tank tests have recently been reassessed and revised estimates of the uncertainties in wave kinematics are presented. Both the deviation from Wheeler theory and the spreading of the results have been estimated as function of depth below the surface. The influence of the revised estimates of the uncertainty in water wave kinematics on the overturning moment of a drag dominated structure is reviewed.
Uncertainties in Prediction of Wave Kinematics in Irregular Waves
Gudmestad, Ove T. (author) / Haver, Sverre (author)
1993-01-01
25 pages
Article/Chapter (Book)
Electronic Resource
English
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