A benchmarking exercise for environmental contours

Andreas F. Haselsteiner*, Ryan G. Coe, Lance Manuel, Wei Chai, Bernt Leira, Guilherme Clarindo, C. Guedes Soares, Ásta Hannesdóttir, Nikolay Dimitrov, Aljoscha Sander, Jan-Hendrik Ohlendorf, Klaus-Dieter Thoben, Guillaume de Hauteclocque, Ed Mackay, Philip Jonathan, Chi Qiao, Andrew Myers, Anna Rode, Arndt Hildebrandt, Boso SchmidtErik Vanem, Arne Bang Huseby

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Environmental contours are used to simplify the process of design response analysis. A wide variety of contour methods exist; however, there have been a very limited number of comparisons of these methods to date. This paper is the output of an open benchmarking exercise, in which contributors developed contours based on their preferred methods and submitted them for a blind comparison study. The exercise had two components—one, focusing on the robustness of contour methods across different offshore sites and, the other, focusing on characterizing sampling uncertainty. Nine teams of researchers contributed to the benchmark. The analysis of the submitted contours highlighted significant differences between contours derived via different methods. For example, the highest wave height value along a contour varied by as much as a factor of two between some submissions while the number of metocean data points or observations that fell outside a contour deviated by an order of magnitude between the contributions (even for contours with a return period shorter than the duration of the record). These differences arose from both different joint distribution models and different contour construction methods, however, variability from joint distribution models appeared to be higher than variability from contour construction methods.
Original languageEnglish
Article number109504
JournalOcean Engineering
Volume236
Number of pages29
ISSN0029-8018
DOIs
Publication statusPublished - 2021

Keywords

  • Environmental contour
  • Metocean extremes
  • Joint distribution
  • Extreme response
  • Structural reliability

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