Understanding extreme ocean environments and their interaction with fixed and floating structures is critical for offshore and coastal design. Design contours are useful to describe the joint behavior of environmental, structural loading, and response variables. We compare different forms of design contours, using theory and simulation, and present a new method for joint estimation of contours of constant exceedance probability for a general set of variables. The method is based on a conditional extremes model from the statistics literature, motivated by asymptotic considerations. We simulate under the conditional extremes model to estimate contours of constant exceedance probability. We also use the estimated conditional extremes model to estimate other forms of design contours, including those based on the first-order reliability method (FORM), without needing to specify the functional forms of conditional dependence between variables. We demonstrate the application of new method in estimation of contours of constant exceedance probability using measured and hindcast data from the Northern North Sea, the Gulf of Mexico, and the North West Shelf of Australia, and quantify their uncertainties using a bootstrap analysis.
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e-mail: kevin.ewans@shell.com
e-mail: jan.flynn@shell.com
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November 2014
Research-Article
On the Estimation of Ocean Engineering Design Contours
Kevin Ewans,
e-mail: kevin.ewans@shell.com
Kevin Ewans
Sarawak Shell Bhd
,eTiQa Twins (Level 23, Tower 1)
,Kuala Lumpur 50450
, Malaysia
e-mail: kevin.ewans@shell.com
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Jan Flynn
e-mail: jan.flynn@shell.com
Jan Flynn
Shell International Exploration and Production
,P.O. Box 60
,AB Rijswijk 2280
, The Netherlands
e-mail: jan.flynn@shell.com
Search for other works by this author on:
Philip Jonathan
Kevin Ewans
Sarawak Shell Bhd
,eTiQa Twins (Level 23, Tower 1)
,Kuala Lumpur 50450
, Malaysia
e-mail: kevin.ewans@shell.com
Jan Flynn
Shell International Exploration and Production
,P.O. Box 60
,AB Rijswijk 2280
, The Netherlands
e-mail: jan.flynn@shell.com
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 3, 2011; final manuscript received April 25, 2014; published online July 16, 2014. Assoc. Editor: John Halkyard.
J. Offshore Mech. Arct. Eng. Nov 2014, 136(4): 041101 (8 pages)
Published Online: July 16, 2014
Article history
Received:
May 3, 2011
Revision Received:
April 25, 2014
Citation
Jonathan, P., Ewans, K., and Flynn, J. (July 16, 2014). "On the Estimation of Ocean Engineering Design Contours." ASME. J. Offshore Mech. Arct. Eng. November 2014; 136(4): 041101. https://doi.org/10.1115/1.4027645
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