New types of current profile criteria are described that are designed to take into account the vertical coherence of deepwater currents in offshore engineering. Reasoning is given why traditional types of current profile criteria can be inappropriate for deepwater locations. The paper describes current profile occurrence criteria that consist of a discrete number of characteristic profiles, each of which has an associated percentage frequency of occurrence. These criteria are appropriate for riser fatigue calculations, including Vortex Induced Vibration (VIV) modelling, and operability assessments. Use of these criteria can reduce the level of overconservatism associated with the traditional criteria, potentially leading to significant cost savings. Two possible methods of deriving these criteria are described, one of which uses Empirical Orthogonal Function (EOF) analysis to simplify the vertical structure of current profiles. The relative merits of each analysis technique are assessed.
Improved Current Profile Criteria for Deepwater Riser Design
Contributed by the OOAE Division for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 2002; final revision, September 2002. Associate Editor: S. Chakrabarti.
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Jeans, G., Grant,, C., and Feld, G. (October 1, 2003). "Improved Current Profile Criteria for Deepwater Riser Design ." ASME. J. Offshore Mech. Arct. Eng. November 2003; 125(4): 221–224. https://doi.org/10.1115/1.1596235
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